Ошибка exception in thread awt eventqueue 0

При запуске программы вылетает вот такой отчёт об ошибке

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
	at core.Main.sendData(Main.java:76)
	at core.Main$1.actionPerformed(Main.java:46)
	at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
	at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
	at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
	at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
	at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
	at java.awt.Component.processMouseEvent(Unknown Source)
	at javax.swing.JComponent.processMouseEvent(Unknown Source)
	at java.awt.Component.processEvent(Unknown Source)
	at java.awt.Container.processEvent(Unknown Source)
	at java.awt.Component.dispatchEventImpl(Unknown Source)
	at java.awt.Container.dispatchEventImpl(Unknown Source)
	at java.awt.Component.dispatchEvent(Unknown Source)
	at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
	at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
	at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
	at java.awt.Container.dispatchEventImpl(Unknown Source)
	at java.awt.Window.dispatchEventImpl(Unknown Source)
	at java.awt.Component.dispatchEvent(Unknown Source)
	at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
	at java.awt.EventQueue.access$200(Unknown Source)
	at java.awt.EventQueue$3.run(Unknown Source)
	at java.awt.EventQueue$3.run(Unknown Source)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
	at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
	at java.awt.EventQueue$4.run(Unknown Source)
	at java.awt.EventQueue$4.run(Unknown Source)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
	at java.awt.EventQueue.dispatchEvent(Unknown Source)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
	at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
	at java.awt.EventDispatchThread.run(Unknown Source)

Вот часть кода, где вылетает ошибка:

public static void sendData(Object obj) {
		try {
			output.flush(); //76 строка
			output.writeObject(obj);
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

Вот часть кода, где находится метод, в котором вылетает ошибка

public void actionPerformed(ActionEvent arg0) {
				if (arg0.getSource() == b1) {
					sendData(t1.getText()); //46 строка
				}
			}

I’m working on a simple calculator program using java and javax.swing

Basically, when you press a button, the program is supposed to fetch the function of that button (number or operation) and display it in the textArea.

The whole logic for the calculator itself doesn’t matter. Also, there’s a clear menu item that clears all the text in textArea.

However, every time a press a button, I get the following error:

Exception in thread «AWT-EventQueue-0» java.lang.NullPointerException
at calculator.CalculatorGUI.actionPerformed(CalculatorGUI.java:106)`

I’m also getting a similar error when I press the clear menu item, it seems like java doesn’t like it when I want to change the text in the text area.

Here’s my code: (Line 106 is in the actionPerfomed method, I’ve labeld it for your convenience)

public class CalculatorGUI implements ActionListener 
{

    // The calculator for actually calculating!
    // private RPNCalculator calculator;

    // The main frame for the GUI
    private JFrame frame;

    // The menubar for the GUI
    private JMenuBar menuBar;

    // The textbox
    private JTextArea textArea;
    private JScrollPane scrollArea;

    // Areas for numbers and operators
    private JPanel numKeysPane;
    private JPanel opKeysPane;

    private String input;
    final String[] numbers = { "1", "2", "3", "4", "5", "6", "7", "8", "9", "0" };
    final String[] operations = { "+", "-", "*", "/" };

    /**
     * Constructor
     */
    public CalculatorGUI() {
        // Initialize the calculator
        calculator = new RPNCalculator();
    }

    /**
     * Initialize and display the calculator
     */
    public void showCalculator() {

        String buttonValue;
        JButton button;
        JMenu menu;
        JMenuItem menuItem;

        // Create the main GUI components
        frame = new JFrame("RPN Calculator");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        numKeysPane = new JPanel(new GridLayout(4, 3));
        opKeysPane = new JPanel(new GridLayout(2, 2));

        initializeMenu();
        initializeNumberPad();
        initializeOps();


        JTextArea textArea = new JTextArea();
        textArea.setEditable(false);
        textArea.setLineWrap(true);
        textArea.setWrapStyleWord(true);
        JScrollPane scrollArea = new JScrollPane(textArea);

        // Create the components to go into the frame and
        // stick them in a container named contents
        frame.getContentPane().add(numKeysPane, BorderLayout.CENTER);
        frame.getContentPane().add(scrollArea, BorderLayout.NORTH);
        frame.getContentPane().add(opKeysPane, BorderLayout.LINE_END);

        // Finish setting up the frame, and show it.
        frame.pack();
        frame.setVisible(true);
    }

    /*
     * (non-Javadoc)
     * 
     * @see java.awt.event.ActionListener#actionPerformed(java.awt.event.ActionEvent)
     */
    public void actionPerformed(ActionEvent e) {
        String s = (String)e.getActionCommand();
        // calculator.performCommand(s);
        textArea.append(s + " ");      // <<--- THIS IS LINE 106
    } 

    /**
     * Initialize the number pad for the calculator
     */


    private void initializeNumberPad() {
        JButton button;
        for (int i = 0; i < numbers.length; i++) {
            button = new JButton(numbers[i]);
            button.addActionListener(this);
            numKeysPane.add(button);
        }
    }

    private void initializeOps(){
        JButton button;
        for (int i = 0; i < operations.length; i++){
            button = new JButton(operations[i]);
            button.addActionListener(this);
            opKeysPane.add(button);
        }
    }

    /**
     * Initialize the menu for the GUI
     */
    private void initializeMenu() {
        JMenu menu;
        JMenuItem menuItem;
        JMenuItem menuItem2;

        // Create a menu with one item, Quit
        menu = new JMenu("Calculator");
        menuItem = new JMenuItem("Quit");
        // When quit is selected, destroy the application
        menuItem.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                // A trace message so you can see this
                // is invoked.
                System.err.println("Close window");
                frame.setVisible(false);
                frame.dispose();
            }
        });
        menuItem2 = new JMenuItem("Clear");
        menuItem2.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e){
                textArea.setText("");
            }
        });
        menu.add(menuItem2);
        menu.add(menuItem);

        // Create the menu bar
        menuBar = new JMenuBar();
        menuBar.add(menu);
        frame.setJMenuBar(menuBar);
    }

    /**
     * Helper method for displaying an error as a pop-up
     * @param message The message to display 
     */
    private static void errorPopup(String message) {
        JOptionPane.showMessageDialog(null, message);
    }
}

Any help would be greatly appreciated! Thanks!

Often NullPointerException errors like exceptions in thread “awt-eventqueue-0” java.lang.nullpointerexception are among the easiest to diagnose. To diagnose and solve the cause of the error, you need to get a quick look at the stack trace from top to bottom.

Read on to learn the cause of this error and how you can solve the error.

One main cause of this error is when you fail to call a constructor on an object but then go ahead and try to use it. Another cause is an accidental declaration of an object in a local scope that has another instance variable using the same name. So, these are the two causes of this Java error. Another cause is writing complex code that makes it difficult to pinpoint the issue.

– Example 1: Failure To Call a Constructor on an Object

Suppose that you are creating a simple check box where a user gets to choose among various choices and depending on what they choose, the image changes to match their choice. If in your code the exception occurs in the constructor for, say Retail on line 25, you will need to evaluate that line.

For instance, if you check the line and you find something like:

brownshirtButton.addItemListener(this);

In this example, it is clear there are two objects in this line that is brownshirtButton and this. Usually, this in Java is popular with the class instance that you are currently in. In this case, you are in the constructor which cannot be this. In such a scenario the brownshirtButton is the culprit. Chances are you did not instantiate that object.

– Example 2: Writing Complex Code

Say you are creating a TicTacToe object. At some point you may end with a code that is as follows:

panels [badg.num].add (newCells [j] [k] = new Cell (this));

If the error message appears on this line, it could indicate a null reference to any of the following:

• panels
• badg
• panels[badg.num
• newCells
• any of New Cells [j]

How To Solve It

To solve this runtime exception issue, you need to first stack trace the source of the problem by reading your code from the top to the bottom. Usually, you will come across exceptions whose origins are in the Java library code. As well, some are in native implementation methods.

To diagnose the problem, skip to the code file you created that is causing the error.  You will see a line indicated. The next thing you need to do is to look at all the instantiated classes (objects) individually as long as they fall in that line. Start by establishing if you made a constructor call on that object.

Once it emerges that you never made that call, then that could be the problem that is causing this error. Now, with that understanding, you need to instantiate that object. You can accomplish this by calling a new class name argument.

– Example 1: Instantiating an Object

Suppose you want to solve the issue in the previous example. In this case, you need to solve the brownshirtButton object issue that is generating this error. There are two ways you can avoid the error when creating a simple check box where a user gets to choose between various items, and depending on what they choose, the image changes to match their choice.

In this case, you can opt to get rid of the reference to brownshirtButton instance variable or instantiate it.

– Example 2: Solving the Complex Code Issue

If you are creating a TicTacToe, and you end with a complex code like this:

panels [badg.num].add (newCells [j] [k] = new Cell (this));

You need to step through the error in this line using a debugger to establish the null object. The only way you can establish if the null pointer exception arises from either newCells or panels is by breaking the code into two. Simplifying and eliminating unknowns is essential in debugging.

The code above has a lot of choices that do not work because it is too complicated. Keep in mind that this error is not impossible, the issue is somewhere in the code. To get started, you can include null checks and simplify the code by breaking it into various lines.

– How To Add Null Checks

Like in most things, there are various ways of accomplishing this. There are two options, you can either implement the null check manually or use java.util.Objects.requireNonNull to evaluate each value j lists in the example above. It is appropriate to implement the null check yourself to see how it functions.

You can opt for a bunch of checks as follows:

if (doo == null)
{
throw new NullPointerException(“doo is null”);
}
else if (dee == null)
{
// set the error message you need to show
}

Alternaively, you can choose to perform null checks like so:

Objects.requireNonNull(doo, “doo is null”);

Objects.requireNonNull(dee, “dee is null”);

Whichever method you choose, when you run the code, you will get a crash message that details what is actually taking place.

FAQs

– What is Exception in Thread “Awt-eventqueue-0” Java.lang.nullpointerexception?

This is an exception error in Java that arises when you fail to call a constructor on an object.  In other words, Java throws this error when you use a reference variable that does not point to any object. Another cause of the NullPointerException error in Java entails accidentally declaring an object in a local setting where there is another variable using the same name.

– How Can You Solve the Error?

The solution to this error requires you to either get rid of the reference to the instance or instantiate the variable in question. To help you accomplish this, perform null checks on the line causing the error. Also, you can break up complex code to make it easy to pinpoint the cause of the error.

– How Can You Fix Java Lang NullPointerException

You can resolve this error by using an if-else condition or try-catch block to establish if the reference variable in question is null before you can dereference it.

– What Is AWT Package in Java

The AWT (Abstract Window Toolkit) package in Java is an API that let you build GUI or window-based apps. Components of the AWT package are platform-dependent. What this means is that the appearance of components will be under the control of the operating system.

Often, the AWT package is heavyweight because its components use the operating system resources. The package offers various components such as checkboxes, labels, and buttons that are used as objects in Java.

– What Is the Role of EventQueue?

The EventQueue in Java is a public class that extends objects. It is a platform-independent class for queuing events from underlying peer classes as well as reputable application classes.

– What Is the Meaning of Java Lang Nullpointerexception?

In Java, it is a runtime exception that takes place once a variable that does not point to any object is accessed. It means the variable refers to nothing. Due to it is a runtime exception, no need to catch and handle it explicitly in the application code.

– What Is Java Lang?

It provides fundamental classes for the Java programming language. The Object is one of the most important classes since it is at the root of class hierarchy and class which are instances that represent classes in run time.

– Why Use Java Lang?

It provides necessary classes for creating an applet as well as the classes an applet relies on to interact with its applet context. Lang in Java offers classes and interfaces for transmitting data between and inside applications.

– In Java, What Is a Runtime Exception?

In Java programming language, the runtime exception acts as the parent class for all exceptions that crash an application when they occur. They are different from other exceptions since these are never checked.

– How Do You Overcome Runtime Exception?

The easiest way you can handle runtime errors in Java is through the use of try-catch blocks. To do this, you need to surround statements capable of throwing runtime exceptions in try-catch blocks. These catch the error and perform the necessary action depending on the needs of the application. For instance, they can throw the right messages.

– How Can You Check if a String Is Null?

Normally, you can check for null through the strict equality operator (!== or ===) to ensure that the value is not null. For instance, the object1 !== null code checks if the variable object1 is not null.

Conclusion

A runtime exception like the error in question is hard to catch before the program executes. However, there is a way you can solve it. Here is a quick recap:

• The error originates from a reference variable that does not point to any object
• It is a runtime exception that causes an application to crash
• The solution is either you instantiate the object or remove the null reference

That is how you can deal with this runtime exception in Java.

The "AWT-EventQueue-0" java.lang.NullPointerException exception occurs when we work with Java AWT package methods, and a null value is passed to any method. This tutorial demonstrates how to solve this NullPointerException in Java.

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException in Java

The "AWT-EventQueue-0" java.lang.NullPointerException occurs when we pass a null value to the AWT package. The NullPointerException exception is the most common in Java.

The NullPointerException occurs when any of the following conditions meet.

1. When accessing and modifying the null object field.
2. When we invoke a method from a null object.
3. When accessing and modifying the slots of the null object.
4. When taking the length of any null array.
5. When we try to synchronize over a null object.
6. When we are throwing a null value.

Let’s try an example that will throw the "AWT-EventQueue-0" java.lang.NullPointerException in Java.

package delftstack;

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.Timer;

@SuppressWarnings("serial")

public class Example extends JFrame implements ActionListener , KeyListener {

    static Dimension Screen_Size = new         Dimension(Toolkit.getDefaultToolkit().getScreenSize());
    Insets Scan_Max = Toolkit.getDefaultToolkit().getScreenInsets(getGraphicsConfiguration());
    int Task_Bar_Size = Scan_Max.bottom;
    static JFrame Start_Screen = new JFrame("Start Screen");
    static JFrame Game_Frame = new JFrame("Begin the Game!");
    static JLabel Cow_Label = new JLabel();
    static int Sky_Int = 1;
    static JLabel Sky_Label = new JLabel();
    static int SECONDS = 1;
    static boolean IS_Pressed = false;
    public static void main(String[] args) {
        new Example();

    }
    public Example() {

        JPanel Buttons_Panel = new JPanel();
        Buttons_Panel.setLayout(null);
        Start_Screen.setSize(new Dimension(Screen_Size.width - getWidth(), Screen_Size.height - Task_Bar_Size - getHeight()));
        Start_Screen.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        Start_Screen.setVisible(true);
        System.out.println(Start_Screen.getSize());

        //buttons

        JButton Start_Button = new JButton("Start");
        Start_Button.addActionListener(this);
        Start_Button.setSize((int) Start_Screen.getWidth()/7, (int) (Start_Screen.getHeight()/15.36));
        Start_Button.setBounds((Start_Screen.getWidth()/2) - Start_Button.getWidth()/2,((int)Start_Screen.getHeight()/2) - Start_Button.getHeight(),Start_Button.getWidth(),Start_Button.getHeight());
        Start_Button.setActionCommand("Start");

        Buttons_Panel.add(Start_Button);
        Start_Screen.add(Buttons_Panel);
    }
    @Override
    public void actionPerformed(ActionEvent Action_Event) {
        Object CMD_Object =  Action_Event.getActionCommand();
        if(CMD_Object == "Start") {
            Start_Screen.setVisible(false);
            //  getClass().getResource("/cow.png") and getClass().getResource("/grass.png") is giving null
            // because there is no image in folder named cow.png or grass.png
            ImageIcon Cow_Image = new ImageIcon(getClass().getResource("/cow.png"));
            ImageIcon Grass_Image = new   ImageIcon(getClass().getResource("/grass.png"));

            Game_Frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            Game_Frame.setSize(Start_Screen.getSize());
            Game_Frame.setVisible(true);
            JPanel Demo_Panel = new JPanel();
            Demo_Panel.setBackground(Color.white);
            Demo_Panel.setLayout(null);
            Demo_Panel.setFocusable(true);
            Game_Frame.add(Demo_Panel);
            Demo_Panel.addKeyListener(this);
            Cow_Label.setBounds( (Start_Screen.getWidth()/2)-105, (Start_Screen.getHeight()/2)-55, 210, 111);
            Cow_Label.setIcon(Cow_Image);
            Demo_Panel.add(Cow_Label);
            Demo_Panel.setVisible(true);
            Cow_Label.setVisible(true);
            JLabel Grass_Label = new JLabel();
            System.out.println("grass");
            //  getClass().getResource("/Sky.png") will throw a nullpointerexception because there is no image in the folder
            ImageIcon Sky1 = new ImageIcon(getClass().getResource("/Sky.png"));
            Sky_Label.setIcon(Sky1);
            Grass_Label.setIcon(Grass_Image);
            Grass_Label.setBounds(0, ( Start_Screen.getHeight()-308), Start_Screen.getWidth(), 350);
            System.out.println("mOooow");
            Demo_Panel.add(Grass_Label);
            Sky_Label.setBounds(1, 56, 1366, 364);
            Demo_Panel.add(Sky_Label);
            System.out.println("google");
        }

    }
    @Override
    public void keyPressed(KeyEvent Key_Event) {
        int CMD_Int = Key_Event.getKeyCode();
    //  getClass().getResource("/cow moving.gif") will throw a nullpointerexception because there is no image in the folder
        ImageIcon Moving_Cow = new ImageIcon(getClass().getResource("/cow moving.gif"));
        System.out.println(CMD_Int);
        IS_Pressed = true;
        if(CMD_Int == 39){
            System.out.println("Key is Pressed");
            Cow_Label.setIcon(Moving_Cow);
        }
        else if(CMD_Int == 37){

        }
        System.out.println("End");
        while(IS_Pressed==true){
            Timer Wait_Please = new Timer("Wait Please");
            try {
                Wait_Please.wait(1000);
            }
            catch(InterruptedException p){}
            int SKY = 1;
            SKY += 1;
            String SKY_String = "/Sky" + String.valueOf(SKY) + ".png";
            ImageIcon SKy = new ImageIcon(getClass().getResource(SKY_String));
            Sky_Label.setIcon(SKy);
            if(IS_Pressed==false){
            Wait_Please.cancel();
            break;
            }
        }
    }



    @Override
    public void keyReleased(KeyEvent Key_Event) {
    //  getClass().getResource("/cow.png") and getClass().getResource("/grass.png") is giving null
        // because there is no image in folder named cow.png or grass.png
        ImageIcon Cow_Image = new ImageIcon(getClass().getResource("/cow.png"));
        int CMD_Int = Key_Event.getKeyCode();
        IS_Pressed = false;
        if(CMD_Int == 39){
            Cow_Label.setIcon(Cow_Image);
        }
        else if(CMD_Int == 37){
            Cow_Label.setIcon(Cow_Image);
        }
    }
    @Override
    public void keyTyped(KeyEvent c) {
        // TODO Auto-generated method stub
    }
}

The code above is about a simple game with a cow standing, and the cow will start moving on pressing the button. It will throw the "AWT-EventQueue-0" java.lang.NullPointerException because the AWT method new ImageIcon(getClass().getResource()) is getting a null entry.

The output for this code is:

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException: Cannot invoke "java.net.URL.toExternalForm()" because "location" is null
    at java.desktop/javax.swing.ImageIcon.<init>(ImageIcon.java:234)
    at delftstack.Example.actionPerformed(Example.java:48)
    at java.desktop/javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1972)
    at java.desktop/javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2313)
...

We can solve this issue by moving the images to the class folder path. We can also remove the / as Windows use \ for path in Java.

And if it is still not working, we can give the full path to the images. Further explanations are commented-out in the code above.

Related Article — Java Exception

• Understanding Runtime Exception in Java
• Java Throwable VS Exception Class
• Re-Throw Exception in Java
• Throw New Exception in Java
• Throw Runtime Exception in Java
• Java.Lang.ClassNotFoundException: Org.SpringFramework.Web.Servlet.DispatcherServlet

hELLO GUYZ PLEASE HELP ME I AM MAKING A HANGMAN GAME THIS IS MY SCHOOL PROJECT AND I HAVE TO SUMBIT IT TOMMOROW AND I AM GETTING A ERROR IN MY CODE
Exception in thread «AWT-EventQueue-0» java.lang.NullPointerException
at HangmanGameFrame.<init>(HangmanGameFrame.java:24)
at HangmanGameFrame$5.run(HangmanGameFrame.java:447)

What I have tried:

HERE IS MY CODE

import java.io.*;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Toolkit;
import java.io.File;
import java.io.FileNotFoundException;
import java.util.ArrayList;
import java.util.Random;
import java.util.Scanner;
import javax.swing.ImageIcon;
import javax.swing.JOptionPane;
import sun.audio.AudioPlayer;
import sun.audio.AudioStream;

/**
*
* @author Muhammmad Kashif
*/
public class HangmanGameFrame extends javax.swing.JFrame {
char c;
String pass;
String[] words=readArray(«words.txt»);
Random rn=new Random();
int randomNumber = rn.nextInt(words.length);
String answer;
int numberofMisses=0;
String rightorWrong;
ArrayList<string> letterArrayList=new ArrayList<>();
int numberofBlank;
ImageIcon hang=new ImageIcon(«First.png»);
ImageIcon hang1=new ImageIcon(«Second.png»);
ImageIcon hang2=new ImageIcon(«Third.png»);
ImageIcon hang3=new ImageIcon(«Fourth.png»);
ImageIcon hang4=new ImageIcon(«Fifth.png»);
ImageIcon hangdead=new ImageIcon(«First.png»);
public HangmanGameFrame() {
initComponents();
getContentPane().setBackground(Color.WHITE);
wrongwords.setText(null);
answer = words[randomNumber];
answer = answer.toUpperCase();

StringBuilder tempDisplayAnswer= new StringBuilder(answer);
for(int x=0; x<=answer.length()-1;x++)
{
tempDisplayAnswer.setCharAt(x,’-‘);
String displayAnswer=tempDisplayAnswer.toString();
labelword.setText(displayAnswer);
}
hangman.setIcon(hang);
exit.setVisible(false);
Dimension dim=Toolkit.getDefaultToolkit().getScreenSize();
this.setLocation(dim.width/2-this.size().width/2,dim.height/2-this.getSize().height/2);
}

/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
@SuppressWarnings(«unchecked»)
// <editor-fold defaultstate=»collapsed» desc=»Generated Code»>
private void initComponents() {

conform = new java.awt.Button();
exit = new javax.swing.JButton();
hangman = new javax.swing.JLabel();
labelword = new javax.swing.JLabel();
inputtext = new javax.swing.JTextField();
outputtext = new javax.swing.JTextField();
infoNOofMisses = new javax.swing.JLabel();
labOutputNoOfMisses = new javax.swing.JLabel();
jScrollPane1 = new javax.swing.JScrollPane();
wrongwords = new javax.swing.JTextArea();
tryagain1 = new javax.swing.JButton();

setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

conform.setLabel(«CONFORM!»);
conform.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
conformActionPerformed(evt);
}
});

exit.setText(«EXIT»);
exit.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
exitActionPerformed(evt);
}
});

labelword.setFont(new java.awt.Font(«Tahoma», 1, 60)); // NOI18N
labelword.setText(«- — — «);

inputtext.addKeyListener(new java.awt.event.KeyAdapter() {
public void keyTyped(java.awt.event.KeyEvent evt) {
inputtextKeyTyped(evt);
}
});

infoNOofMisses.setText(«No. Of Misses:»);

wrongwords.setColumns(20);
wrongwords.setRows(5);
jScrollPane1.setViewportView(wrongwords);

tryagain1.setText(«TRY AGAIN!»);
tryagain1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
tryagain1ActionPerformed(evt);
}
});

javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addContainerGap(32, Short.MAX_VALUE)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addComponent(infoNOofMisses, javax.swing.GroupLayout.PREFERRED_SIZE, 98, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(18, 18, 18)
.addComponent(labOutputNoOfMisses, javax.swing.GroupLayout.PREFERRED_SIZE, 115, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(51, 51, 51)
.addComponent(labelword)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(hangman, javax.swing.GroupLayout.PREFERRED_SIZE, 168, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(221, 221, 221))
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addComponent(conform, javax.swing.GroupLayout.PREFERRED_SIZE, 131, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(101, 101, 101)
.addComponent(exit, javax.swing.GroupLayout.PREFERRED_SIZE, 154, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(59, 59, 59))))
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addGap(157, 157, 157)
.addComponent(inputtext, javax.swing.GroupLayout.PREFERRED_SIZE, 155, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 355, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap())
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addComponent(tryagain1, javax.swing.GroupLayout.PREFERRED_SIZE, 195, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(40, 40, 40))))
.addGroup(layout.createSequentialGroup()
.addGap(18, 18, 18)
.addComponent(outputtext, javax.swing.GroupLayout.PREFERRED_SIZE, 628, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(0, 0, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(hangman, javax.swing.GroupLayout.PREFERRED_SIZE, 93, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(58, 58, 58)
.addComponent(tryagain1, javax.swing.GroupLayout.PREFERRED_SIZE, 58, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 249, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(39, 39, 39))
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(labOutputNoOfMisses, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(77, 77, 77)
.addComponent(labelword, javax.swing.GroupLayout.PREFERRED_SIZE, 39, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(layout.createSequentialGroup()
.addGap(24, 24, 24)
.addComponent(infoNOofMisses, javax.swing.GroupLayout.PREFERRED_SIZE, 27, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addGap(0, 0, Short.MAX_VALUE)))
.addGap(18, 18, 18)
.addComponent(inputtext, javax.swing.GroupLayout.PREFERRED_SIZE, 59, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(133, 133, 133)))
.addComponent(outputtext, javax.swing.GroupLayout.PREFERRED_SIZE, 49, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(41, 41, 41)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addComponent(conform, javax.swing.GroupLayout.PREFERRED_SIZE, 44, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(exit, javax.swing.GroupLayout.PREFERRED_SIZE, 58, javax.swing.GroupLayout.PREFERRED_SIZE)))
);

pack();
}//
public static String[] readArray(String file){
//step 1: Count How many Lines
// Step2: Create array and copy the elements in.
int ctr=0;
try{
Scanner s1=new Scanner(new File(file));
while(s1.hasNextLine())
{
ctr=ctr+1;
s1.next();
}
String[] words=new String[ctr];
Scanner s2=new Scanner(new File(file));
for(int i=0;i<ctr;i++)
{
words[i]=s2.next();
}
return words;
}
catch(FileNotFoundException e)
{

return null;}
}
static public int SortedLinearSearch(String [] A,String B)
{
for(int k=0;k<A.length;k++)
{
if(A[k].equals(B))
{
return k;
}
}
return -1;
}
private void exitActionPerformed(java.awt.event.ActionEvent evt) {
HangmanGameFrame.this.dispose();
}

private void conformActionPerformed(java.awt.event.ActionEvent evt) {
numberofBlank=(labelword.getText()).length();
String b=inputtext.getText();
for(int x=0;x<=answer.length()-1;x++){ //add char of the answer to «LetterArrayList»
letterArrayList.add(String.valueOf(answer.charAt(x)));
}
String[] letter=new String[answer.length()];
for(int x=0;x<answer.length()-1;x++) // Convert Array List To Array
{
letter[x]=letterArrayList.get(x);
}
if(numberofMisses<6)// error trapping for blank inputbox
{
if(wrongwords.getText().equals(«»)){
pass=»yes»;
}
else{
pass=»no»;
}
if(inputtext.getText().equals(«»))
{
outputtext.setText(«Please Give Me A Letter! «);
}
if(!inputtext.getText().equals(«»)){
for(int x=0;x<=(wrongwords.getText()).length()-1;x++)
{
char WrongLetter=(wrongwords.getText()).charAt(x); //determine wheather key is repeated or not
if((inputtext.getText()).charAt(0) != WrongLetter){
pass=»yes»;
}
else if((inputtext.getText()).charAt(0)== WrongLetter){
pass=»no»;
outputtext.setText(«This Letter Is Already Used»);
break;
}
}}

if(pass==»YES»){
if(Character.isLetter(c)){
if(SortedLinearSearch(letter,b)== -1){
wrongwords.setText(wrongwords.getText()+String.valueOf(inputtext.getText())+» «);
//For Audios
InputStream in;
try{
in=new FileInputStream(new File(«»));
AudioStream audios=new AudioStream(in);
AudioPlayer.player.start(audios);
}
catch(Exception e)
{
JOptionPane.showMessageDialog(null,e);
}
///////////

for(int x=0;x<wrongwords.getText().length()-1;x++)
{
if(Character.isLetter((wrongwords.getText()).charAt(x))){
numberofMisses++;
break;
}
}
}
}
}
inputtext.setText(null);
}
//change image of Hangman
if(numberofMisses==1)
{
hangman.setIcon(hang);
}
else if(numberofMisses==2)
{
hangman.setIcon(hang1);
}
else if(numberofMisses==3)
{
hangman.setIcon(hang2);
}
else if(numberofMisses==4)
{
hangman.setIcon(hang3);
}
else if(numberofMisses==5)
{
hangman.setIcon(hang4);
}

if(numberofMisses == 6) //loosing condition
{
hangman.setIcon(hangdead);
outputtext.setText(«You Lost !»);
inputtext.setEnabled(false);
conform.setEnabled(false);
exit.setEnabled(true);
////// AUDIO
InputStream in;
try{
in=new FileInputStream(new File(«»));
AudioStream audios=new AudioStream(in);
AudioPlayer.player.start(audios);
}
catch (Exception e){
JOptionPane.showMessageDialog(null,e);

}
////////////////////////////////////////////////////////////////
}

if(SortedLinearSearch(letter,b)!=-1){
StringBuilder tempWord=new StringBuilder(labelword.getText());
tempWord.setCharAt(SortedLinearSearch(letter,b),letter[SortedLinearSearch(letter,b)].charAt(0));
String displayAnswer=tempWord.toString();
labelword.setText(displayAnswer);
//////audio
InputStream in;
try{
in=new FileInputStream(new File(«»));
AudioStream audios=new AudioStream(in);
AudioPlayer.player.start(audios);
}
catch (Exception e){
JOptionPane.showMessageDialog(null,e);
}
///////////////////////////////////
}
for(int x=0;x<=labelword.getText().length()-1;x++)
{
if(((labelword.getText()).charAt(x)) != ‘-‘){
numberofBlank—; //count number Of blanks in labelword
}
}
if(numberofBlank ==0){
conform.setEnabled(false);//if no label — player wins
outputtext.setText(«Hurray! You Won»);
exit.setVisible(true);
InputStream in;
try{
in=new FileInputStream(new File(«»));
AudioStream audios=new AudioStream(in);
AudioPlayer.player.start(audios);
}
catch (Exception e){
JOptionPane.showMessageDialog(null,e);
}
///////////////////////////
}
labOutputNoOfMisses.setText(String.valueOf(numberofMisses));
}

private void inputtextKeyTyped(java.awt.event.KeyEvent evt) {
if(numberofMisses<6){
c=evt.getKeyChar();
if(!(Character.isLetter(c))){
outputtext.setText(«A Letter Please»);
evt.consume();
inputtext.setText(«»);

}
else{
if(inputtext.getText()!=null){
inputtext.setText(null);
outputtext.setText(«»);
}
if(Character.isLowerCase(c)){
evt.setKeyChar(Character.toUpperCase(c));
}}
}
}

private void tryagain1ActionPerformed(java.awt.event.ActionEvent evt) {
this.setVisible(false);
new HangmanGameFrame().setVisible(true); //this will refresh page
///////////audio
InputStream in;
try{
in=new FileInputStream(new File(«»));
AudioStream audios=new AudioStream(in);
AudioPlayer.player.start(audios);
}
catch (Exception e){
JOptionPane.showMessageDialog(null,e);

}
}

/**
* @param args the command line arguments
*/
public static void main(String args[]) {
/* Set the Nimbus look and feel */
//<editor-fold defaultstate=»collapsed» desc=» Look and feel setting code (optional) «>
/* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
* For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if («Nimbus».equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(HangmanGameFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(HangmanGameFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(HangmanGameFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(HangmanGameFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//

/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new HangmanGameFrame().setVisible(true);
}
});
}

// Variables declaration — do not modify
private java.awt.Button conform;
private javax.swing.JButton exit;
private javax.swing.JLabel hangman;
private javax.swing.JLabel infoNOofMisses;
private javax.swing.JTextField inputtext;
private javax.swing.JScrollPane jScrollPane1;
private javax.swing.JLabel labOutputNoOfMisses;
private javax.swing.JLabel labelword;
private javax.swing.JTextField outputtext;
private javax.swing.JButton tryagain1;
private javax.swing.JTextArea wrongwords;
// End of variables declaration
static class setVisible{
public setVisible(boolean b){

}
}
}

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package Application;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.File;
import java.io.FileInputStream;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import org.xml.sax.helpers.DefaultHandler;
import javax.swing.DefaultComboBoxModel;
import javax.swing.JOptionPane;
import Assingment.User;
import Assingment.NormalUser;
import Assingment.AdminUser;
import Assingment.UserList;
import Assingment.BusinessManager;
import Assingment.UserHandler;

/**
 *
 * @author Tristan
 */
public class UserManagement extends javax.swing.JFrame {

    private BusinessManager theBM;
    private UserList users;
    private AdminUser adminUsers;
    private NormalUser normalUsers;
    private DefaultComboBoxModel userModel;
    private File fileName;
    private String[] userNames;

    /** Creates new form UserManagement */
    public UserManagement() {
        createDM();
        createUserCmb();
        initComponents();

        // Create the File object to hold the file name
        fileName = new File("C:\Users\Tristan\Desktop\edited\Assingment 2010-01-16 at 16.11.38", "UserData.xml");

        // Create the data in a Branch object, then get the
        // account numbers and place them in the combo box.
        getData();
        userNames = users.getUserNames();
        userModel = new DefaultComboBoxModel(userNames);

        // NetBeans method to initialise GUI components


        // Show the data for the first Users
        cmbUsers.setSelectedIndex(0);
        showUsersDetails();
    }

    private void getData() {
        // Set up the file details and create the parser, then start it.
        // On completion, retrieve the accounts and display them.
        DefaultHandler handler = new UserHandler();

        try {
            SAXParserFactory factory = SAXParserFactory.newInstance();
            SAXParser parser = factory.newSAXParser();
            parser.parse(fileName, handler);
        } catch (Exception err) {
            System.out.println("Exception: " + err.getMessage());
            err.printStackTrace();
        }

        // On completion of the parsing process, get the branch object
        // created by the account handler
        users = ((UserHandler) handler).getUserlist();
    }

    private void createDM() {
// Creates the model through test data
        generateTD();
    }

    private void createUserCmb() {
        String[] userNames = users.getUserNames();
        userModel = new DefaultComboBoxModel(userNames);
    }

    private void generateTD() {
        // This method creates the data model from hard-coded test data.

        NormalUser nUser;
        AdminUser aUser;
// Create the object that controls the data model

        theBM = new BusinessManager();

        // allows the GUI to access the objects they contain.
        users = theBM.getUsers();


        aUser = new AdminUser("Tristan Parker", "taparker", "tristan@parker.com", 2);
        users.addUser(aUser);

        nUser = new NormalUser("Caroline Williams", "cmwillaims", "caroline@williams.com", 2);
        users.addUser(nUser);
    }

// Event Handlers
    private void showUsersDetails() {
        User selected = users.getUserAt(cmbUsers.getSelectedIndex());
        txtEmailAddress.setText(selected.getEmail());
        txtUsername.setText(selected.getUserID());

        if (selected instanceof AdminUser) {
            radAdmin.setSelected(true);
        } else {
            radNormal.setSelected(true);
        }

    }

    private void addUserDetails() {
        AddUserGUI createUser;
        User user;

        user =new AdminUser();
        user =new NormalUser();
        createUser =new AddUserGUI(this, true, user);
        createUser.setVisible(true);

        if (createUser.getCloseButton().equals("OK")) {
            users.addUser(user);
            userModel.addElement(user.getName());
            cmbUsers.setSelectedIndex(users.size() - 1);
        }

    }

    private void updateUser() {
        int selectedIndex = cmbUsers.getSelectedIndex();
        if (selectedIndex == -1) {
            JOptionPane.showMessageDialog(null,
                    "User not selected!", "Error",
                    JOptionPane.ERROR_MESSAGE);
        } else {
            AddUserGUI augUpdate;
            User selected = users.getUserAt(selectedIndex);

            augUpdate =
                    new AddUserGUI(this, true, selected);
            augUpdate.setVisible(true);

            // On return from the dialog, rebuild model in case
            // the name has changed
            if (augUpdate.getCloseButton().equals("OK")) {
                userModel = new DefaultComboBoxModel(users.getUserNames());
                cmbUsers.setModel(userModel);
                cmbUsers.setSelectedIndex(selectedIndex);
            }

        }
    }

    private void deleteUser() {
        int confirmed = JOptionPane.showConfirmDialog(null,
                "Are you sure you want to delete this user ",
                "Confirm closure!", JOptionPane.YES_NO_OPTION);
        if (confirmed == JOptionPane.YES_OPTION) {
            users.removeUserAt(cmbUsers.getSelectedIndex());
            userModel.removeElementAt(cmbUsers.getSelectedIndex());
        }

    }

    // Save and exit
    private void saveAndExit() {
        FileOutputStream outStream;
        PrintWriter pw;
        User user;

        // Create stream and write the DTD
        try {
            outStream = new FileOutputStream(fileName);
            pw = new PrintWriter(outStream);

            // write out DTD
            pw.println("<?xml version = "1.0" standalone = "yes"?>");
            pw.println("<!DOCTYPE Users [");
            pw.println("  <!ELEMENT Users (aUser, nUser)+ >");
            pw.println("  <!ELEMENT aUser (name, userID, emailAddress) >");
            pw.println("  <!ELEMENT nUser (name, userID, emailAddress) >");
            pw.println("  <!ELEMENT name (#PCDATA) >");
            pw.println("  <!ELEMENT userID (#PCDATA) >");
            pw.println("  <!ELEMENT emailAddress (#PCDATA) >");
            pw.println("] >");

            // Write out the data
            pw.println("<Users>");

            // Write out the xml representation of each account object.
            // It doesn't matter which type of account it is - because
            // BankAccount has a getXML() method as well as the sub-classes
            // having the same signature methods, it will use whichever is
            // appropriate to the current object.
            for (int ct = 0; ct < users.size(); ct++) {

                user = users.getUserAt(ct);
                pw.println(user.getXML());
            }


            pw.println("</Users>");

            // Close the file
            pw.close();
        } catch (IOException err) {
            err.printStackTrace();
        }

        // Finally, close the program.
        System.exit(0);
    }

fileName = new File("C:\Users\Tristan\Desktop\edited\Assingment 2010-01-16 at 16.11.38", "UserData.xml");

public class Hangman extends JFrame{

    private JButton a;  //created variable 'a' to refer to a future button.

    public Hangman(){
        JButton n = new JButton("n");  //then here I put "JButton" again, and aparently didn't need that? Because when I removed JButton from this line, everything went back to normal.
    }


    //then down here I had another method that was used to set a few properties of n.

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posted 14 years ago

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