I can't understand the error.

**Shivam24** · July 19th, 2011, 10:19 PM

When i try running my program i get this error:
java.lang.NoSuchMethodError: main
Exception in thread "main" Java Result: 1

This is my code:

package button_game;
 
import javax.swing.*; 
import java.awt.*;
import java.awt.event.*;
public class Button_Game  {
 
 static int k;
 
 
    private static class A1 implements ActionListener{
 
    public void actionPerformed(ActionEvent e){
 
 
     k = 1;
 
 
    }
 
 private static class B1 implements ActionListener {
        public void actionPerformed(ActionEvent e){  
            System.exit(0);
                                                  }  
 }
 
 //addComponentsToPane positions the buttons on the screen randomly
   public static void addComponentsToPane(Container pane){
       int r = 1;
       while (r == 1)
       {               r = r +1;
       int x;
       int y;
        x = (int)(200*Math.random());
    y = (int)(200*Math.random());
 
 
        pane.setLayout(null);
       int a = (int)(1000*Math.random());
        int b = a%2;
        if (b == 0){
            String c = Integer.toString(a);
    JButton A2 = new JButton(c);
    JButton B2 = new JButton();
    A1 listener = new A1();
    A2.addActionListener(listener);                
    B2.addActionListener(listener);
    pane.add(B2);
    pane.add(A2);
    Insets insets = pane.getInsets();
    Dimension size = B2.getPreferredSize();
    B2.setBounds(x + insets.left, x + insets.top, size.width, size.height);
    size = A2.getPreferredSize();
    A2.setBounds(y + insets.left, y + insets.top, size.width, size.height);
                   }
        else if(b != 0);
        int c = a +1;
        String d = Integer.toString(c);
 JButton A2 = new JButton(d);
    JButton B2 = new JButton();
    A1 listener = new A1();
    A2.addActionListener(listener);                
    B2.addActionListener(listener);
    pane.add(B2);
    pane.add(A2);
    Insets insets = pane.getInsets();
    Dimension size = B2.getPreferredSize();
    B2.setBounds(x + insets.left, x + insets.top, size.width, size.height);
    size = A2.getPreferredSize();
    A2.setBounds(y + insets.left, y + insets.top, size.width, size.height); 
                       while (k == 1){
 
        x = (int)(200*Math.random());
    y = (int)(200*Math.random());
 
 
        pane.setLayout(null);
 
        if (b == 0){
 
    A2.addActionListener(listener);                
    B2.addActionListener(listener);
    pane.add(B2);
    pane.add(A2);
 
    B2.setBounds(x + insets.left, x + insets.top, size.width, size.height);
    size = A2.getPreferredSize();
    A2.setBounds(y + insets.left, y + insets.top, size.width, size.height);
                   }
        else if(b != 0);
 
    A2.addActionListener(listener);                
    B2.addActionListener(listener);
    pane.add(B2);
    pane.add(A2);
 
    B2.setBounds(x + insets.left, x + insets.top, size.width, size.height);
    size = A2.getPreferredSize();
    A2.setBounds(y + insets.left, y + insets.top, size.width, size.height); 
 
       }                                   
       }
 
               } 
    //this runs the game
 
    private static void runGUI(){
 
        JFrame window = new JFrame("Button Game");
        addComponentsToPane(window.getContentPane());
 
        window.setSize(300,300);
        window.setVisible(true);
 
 
    }
 
 
 
 
//this part runs the subroutine which runs the game
 
   public static void main(String Args[]){
 
  javax.swing.SwingUtilities.invokeLater(new Runnable(){
 
      public void run(){
 
          runGUI();
 
 
          } 
 
 
 
  });
 
  }
    }
}

**Junky** · July 19th, 2011, 10:25 PM

You have to compile your code first. Since it doesn't compile you will need to fix the errors first before you can run your program.

**Shivam24** · July 19th, 2011, 11:30 PM

what are the errors? forgive me for being a noob at java programming

**Junky** · July 19th, 2011, 11:44 PM

I'm not a compiler. The compiler is better suited to tell you what they are and where they are. Does your code compile?

The error I thought was there was due to the browser not correctly displaying the underscore in your class name.

**JavaPF** · July 20th, 2011, 03:51 AM

I can see a main method in this code and it compiled fine for me in Eclipse. It pops up the GUI with 2 buttons on but they don't do anything.

**Norm** · July 20th, 2011, 06:42 AM

This looks like a continuation of a problem the OP posted on another thread. I think that The posted code is not what he was executing. The code from the other thread has a call to the main() which was left out of the code posted here. If any of you had your crystal balls working you would have known that.

**kalyankasyapcse** · July 21st, 2011, 01:56 PM

main method defined in the Inner subclass.... check it out once

Originally Posted by Shivam24

When i try running my program i get this error:
java.lang.NoSuchMethodError: main
Exception in thread "main" Java Result: 1

This is my code:

package button_game;
 
import javax.swing.*; 
import java.awt.*;
import java.awt.event.*;
public class Button_Game  {
 
 static int k;
 
 
    private static class A1 implements ActionListener{
 
    public void actionPerformed(ActionEvent e){
 
 
     k = 1;
 
 
    }
 
 private static class B1 implements ActionListener {
        public void actionPerformed(ActionEvent e){  
            System.exit(0);
                                                  }  
 }
 
 //addComponentsToPane positions the buttons on the screen randomly
   public static void addComponentsToPane(Container pane){
       int r = 1;
       while (r == 1)
       {               r = r +1;
       int x;
       int y;
        x = (int)(200*Math.random());
    y = (int)(200*Math.random());
 
 
        pane.setLayout(null);
       int a = (int)(1000*Math.random());
        int b = a%2;
        if (b == 0){
            String c = Integer.toString(a);
    JButton A2 = new JButton(c);
    JButton B2 = new JButton();
    A1 listener = new A1();
    A2.addActionListener(listener);                
    B2.addActionListener(listener);
    pane.add(B2);
    pane.add(A2);
    Insets insets = pane.getInsets();
    Dimension size = B2.getPreferredSize();
    B2.setBounds(x + insets.left, x + insets.top, size.width, size.height);
    size = A2.getPreferredSize();
    A2.setBounds(y + insets.left, y + insets.top, size.width, size.height);
                   }
        else if(b != 0);
        int c = a +1;
        String d = Integer.toString(c);
 JButton A2 = new JButton(d);
    JButton B2 = new JButton();
    A1 listener = new A1();
    A2.addActionListener(listener);                
    B2.addActionListener(listener);
    pane.add(B2);
    pane.add(A2);
    Insets insets = pane.getInsets();
    Dimension size = B2.getPreferredSize();
    B2.setBounds(x + insets.left, x + insets.top, size.width, size.height);
    size = A2.getPreferredSize();
    A2.setBounds(y + insets.left, y + insets.top, size.width, size.height); 
                       while (k == 1){
 
        x = (int)(200*Math.random());
    y = (int)(200*Math.random());
 
 
        pane.setLayout(null);
 
        if (b == 0){
 
    A2.addActionListener(listener);                
    B2.addActionListener(listener);
    pane.add(B2);
    pane.add(A2);
 
    B2.setBounds(x + insets.left, x + insets.top, size.width, size.height);
    size = A2.getPreferredSize();
    A2.setBounds(y + insets.left, y + insets.top, size.width, size.height);
                   }
        else if(b != 0);
 
    A2.addActionListener(listener);                
    B2.addActionListener(listener);
    pane.add(B2);
    pane.add(A2);
 
    B2.setBounds(x + insets.left, x + insets.top, size.width, size.height);
    size = A2.getPreferredSize();
    A2.setBounds(y + insets.left, y + insets.top, size.width, size.height); 
 
       }                                   
       }
 
               } 
    //this runs the game
 
    private static void runGUI(){
 
        JFrame window = new JFrame("Button Game");
        addComponentsToPane(window.getContentPane());
 
        window.setSize(300,300);
        window.setVisible(true);
 
 
    }
 
 
 
 
//this part runs the subroutine which runs the game
 
   public static void main(String Args[]){
 
  javax.swing.SwingUtilities.invokeLater(new Runnable(){
 
      public void run(){
 
          runGUI();
 
 
          } 
 
 
 
  });
 
  }
    }
}

Thread: I can't understand the error.

LinkBack

Thread Tools

Display

I can't understand the error.

Related threads:

Re: I can't understand the error.

Re: I can't understand the error.

Re: I can't understand the error.

Re: I can't understand the error.

Re: I can't understand the error.

Re: I can't understand the error.

Similar Threads

I don't understand what I'm supposed to do

I dont understand why this happens....

Can't understand why Interfaces are there

I can''t understand this error

2 errors I can't understand