JAVA CODE NoSuchMethodError: main

[craztfreak04]

i tried executing this code but it compiles with the build output as

"Note: K:\tower.java uses or overrides a deprecated API.
Note: Recompile with -Xlint:deprecation for details.

Process completed."

and the General output as

"java.lang.NoSuchMethodError: main
Exception in thread "main"
Process completed."

i executed this in JCreator and it does not give me an output. Plz help me...its reali urgent. I have posted the codin below

import java.awt.*;
import java.awt.event.*;
import java.applet.*;
import java.util.*;

public class tower extends Applet 
{
    TowerPanel panel;
    TowerControl control;
 
    public void init() 
    {
    	  

	resize(500,450);
	setLayout(new BorderLayout());

	panel = new TowerPanel();
	add("Center", panel);
	add("South", control = new TowerControl(panel));
	
    }

    public void start()
    {
		panel.start();
    }

    public void stop()
    {
		panel.stop();
    }
    
    
    public boolean action(Event evt, Object arg) 
    {
        if (arg instanceof Boolean) 
        	{
        		
            if (((Checkbox)evt.target).getLabel().equals("Reset"))
            	 {
            	 	
                panel.reset = ((Boolean)arg).booleanValue();
                
            	 }else
           		 {
           		 	
                panel.reset = ((Boolean)arg).booleanValue();
           		 }
           		 
            return true;
            
        	}
        	
        return false;
    }
}

class Towering
 {
 	
	int num_rings[] = new int[3];
	int top_size[] = new int[3];

	public Towering(int a)
	{
		num_rings[0] = a;
		num_rings[1] = 0;
		num_rings[2] = 0;
		top_size[0] = 40;
		top_size[1] = 1000;
		top_size[2] = 1000;
	}

	public void reset(int b)
	{
		num_rings[0] = b;
		num_rings[1] = 0;
		num_rings[2] = 0;
		top_size[0] = 40;
		top_size[1] = 1000;
		top_size[2] = 1000;
	}

}

class ring
 {
 	
	int ring_size[] = new int[10];
	int old_x[] = new int[10];
	int which_x[] = new int[10];
	int which_y[] = new int[10];
	int order[] = new int[10];
	int which_tower[] = new int[10];

	public ring(int a)
	{
		
	 for(int i = 0; i<a; i++)
	 	{
			ring_size[i] = 40+20*i;
			which_x[i] = 100;
			old_x[i] = which_x[i];
			which_y[i] = 400-30*(a-i);
			order[i] = a-i;
			which_tower[i] = 0;
		}
	}

	public void reset(int b)
	{
		
	 for(int i = 0; i<b; i++)
	 	{
		ring_size[i] = 40+20*i;
		which_x[i] = 100;
		old_x[i] = which_x[i];
		which_y[i] = 400-30*(b-i);
		order[i] = b-i;
		which_tower[i] = 0;
		
		}
	}
}

class TowerPanel extends Panel implements Runnable
{
	Thread going = null;
	int width = 500;
	int height = 400;
	int tower_height = 350;
	int tower_width = 20;
	int num_rings = 8;
	int pick_ring = 1000;
	int tempx;
	int tempy;
	boolean win = false;
	boolean reset;

	//special effect words
	String s = new String("Tower of Hanoi : By :- Razia Roshan");
	char separated[];
	int x_coord = 0, y_coord = 0;

	Towering towers = new Towering(num_rings);
	ring rings = new ring(num_rings);

	TowerPanel()
	{
		setFont(new Font("TimesRoman",Font.BOLD,40));
		setBackground(new Color(170,170,170));
		separated = new char [s.length()];
		s.getChars(0,s.length(),separated,0);
	}

	public void paint(Graphics g)
	{
		//special words
		for(int i=0;i<s.length();i++)
		{
		x_coord = (int) (Math.random()*10+15*i+100);
		y_coord = (int) (Math.random()*10+36);
		g.setColor(new Color(200-10*i, 10*i, 10*i));
		g.drawChars(separated, i,1,x_coord,y_coord);
		}

		//drawing those three towers
		g.setColor(Color.red);
		g.fill3DRect(90,height-tower_height, tower_width, tower_height, true);
		g.setColor(Color.blue);
		g.fill3DRect(240,height-tower_height, tower_width, tower_height, true);
		g.setColor(Color.yellow);
		g.fill3DRect(390,height-tower_height, tower_width, tower_height, true);


		//drawing all the rings
		g.setColor(Color.black);
		for(int j=0;j<num_rings;++j)
			{
			g.setColor(new Color(20*j+55,200-20*j,20*j+55));
			g.fill3DRect(rings.which_x[j]-rings.ring_size[j]/2, rings.which_y[j], rings.ring_size[j], 30, true);
			}

		//Congratulation
		if(win)
			{
			g.setColor(Color.white);
			g.drawString("Congratulation!!!",150,150);
			}

	}

	public synchronized boolean mouseDown(Event evt, int x, int y) 
	{
		for(int k=0; k<num_rings; ++k)
			{
				if(rings.order[k] == towers.num_rings[rings.which_tower[k]]) 
				{
					if((x>=(rings.which_x[k]-rings.ring_size[k]/2))&&(x<=((rings.which_x[k]-rings.ring_size[k]/2)+rings.ring_size[k])))
					{
	 					if((y>=rings.which_y[k])&&(y<=(rings.which_y[k]+30)))
	 					{
							pick_ring = k;
						}		
					}
				}
			}
		return true;
	}

	public synchronized boolean mouseDrag(Event evt, int x, int y)
	 {
		if(pick_ring!=1000)
			{
				rings.which_x[pick_ring] = x;
				rings.which_y[pick_ring] = y;
			
				//repaint(1,x-40,y-40,rings.ring_size[pick_ring]*5,200);
				repaint();
			}
		return true;
	}

	public synchronized boolean mouseUp(Event evt, int x, int y)
	 {
		if(pick_ring!=1000)
			{
			if((140>=rings.which_x[pick_ring])&&(100<=(rings.which_x[pick_ring]+rings.ring_size[pick_ring]))&&(rings.ring_size[pick_ring]<towers.top_size[0]))
				{
				  ++towers.num_rings[0];
			 	 --towers.num_rings[rings.which_tower[pick_ring]];
				  rings.which_tower[pick_ring] = 0;
				  rings.which_x[pick_ring] = 100;
				  rings.order[pick_ring] = towers.num_rings[0];
				  rings.which_y[pick_ring] = 400-30*towers.num_rings[0];
				}else if((280>=rings.which_x[pick_ring])&&(240<=(rings.which_x[pick_ring]+rings.ring_size[pick_ring]))&&(rings.ring_size[pick_ring]<towers.top_size[1]))
				{
	 		  			++towers.num_rings[1];
			  			--towers.num_rings[rings.which_tower[pick_ring]];
			  			rings.which_tower[pick_ring] = 1;
			 			 rings.which_x[pick_ring] = 250;
			 			 rings.order[pick_ring] = towers.num_rings[1];
			 			 rings.which_y[pick_ring] = 400-30*towers.num_rings[1];

				}else if((430>=rings.which_x[pick_ring])&&(390<=(rings.which_x[pick_ring]+rings.ring_size[pick_ring]))&&(rings.ring_size[pick_ring]<towers.top_size[2]))
					{
			  			++towers.num_rings[2];
			 			 --towers.num_rings[rings.which_tower[pick_ring]];
			 			 rings.which_tower[pick_ring] = 2;
			 			 rings.which_x[pick_ring] = 400;
			 			 rings.order[pick_ring] = towers.num_rings[2];
			 			 rings.which_y[pick_ring] = 400-30*towers.num_rings[2];
					}else
					{
					 	 rings.which_x[pick_ring] = rings.old_x[pick_ring];
						  rings.which_y[pick_ring] = 400-30*towers.num_rings[rings.which_tower[pick_ring]];
					}
			}
						rings.old_x[pick_ring] = rings.which_x[pick_ring];
						pick_ring = 1000;

						//recompute the to_size for all towers
						for(int z=0;z<num_rings;++z)
						{
							if(rings.order[z] == towers.num_rings[rings.which_tower[z]])
							{
								towers.top_size[rings.which_tower[z]] = rings.ring_size[z];
							}
						}

		//see if the user wins
		for(int t=0;t<3;++t)
		{
			if((t!=0)&&(towers.num_rings[t] == num_rings))
				{
				win = true;
				}
			if(towers.num_rings[t] == 0)
				{
				towers.top_size[t] = 1000;
				}
		}
		repaint();
		return true;
	}

	public void start()
	{
		if(going == null)
		{
			going = new Thread(this);
			going.start();
		}
	}

	public void stop() 
		{
			going = null;
		}

/*
	private Image offScreenImage;
	private Dimension offScreenSize;
	private Graphics offScreenGraphics;

	public final synchronized void update (Graphics g){
		Dimension d = size();
		if((offScreenImage == null) || (d.width !=offScreenSize.width) || (d.height != offScreenSize.height)) {
			offScreenImage = createImage(d.width, d.height);
			offScreenSize = d;
			offScreenGraphics = offScreenImage.getGraphics();
		}
		paint(offScreenGraphics);
		g.drawImage(offScreenImage, 0, 0, null);
	}

*/
	public void run() 
		{
			while (going!=null) 
			{
				try {Thread.sleep(100);} catch (InterruptedException e){}
				repaint(1,0,0,500,45);
				//repaint();
			}
			
	 		going = null;
		}


    public void reset(boolean filled, int num_blocks)
     {
		win = false;
		num_rings = num_blocks;
		towers.reset(num_rings);
		rings.reset(num_rings);
		repaint();
   	 }
}

class TowerControl extends Panel 
{
    TextField s;
    TextField e;
    TowerPanel pa;

    public TowerControl(TowerPanel pa) 
    {
		this.pa = pa;
		add(s = new TextField("8", 4));
		add(new Button("Reset Blocks Number"));
    }

    public boolean action(Event ev, Object arg)
    {
		if (ev.target instanceof Button)
		 {
	   		 String label = (String)arg;

	   		 pa.reset(label.equals("Reset Blocks Number"),Integer.parseInt(s.getText().trim()));

	    return true;
		}

		return false;
    }
}

[masijade]

Well, do you have method "main" in those classes?

http://java.sun.com/docs/books/tutorial/getStarted/application/index.html

[craztfreak04]

no i havent got a main method in the calsses....this is an applet program..if so where should i include the main method in the class???

[peter_budo]

no i havent got a main method in the calsses....this is an applet program..if so where should i include the main method in the class???

You got that error because you tried to execute that applet as Java application. Read this how to deploy applet

[craztfreak04]

well yeah i did try that way n it shot me with the same error again, but instead if i add the general main method which is public static void main(String [] arg) it does not show any error but the thin is i cant open the program in the web browser... i have two questions now

1) does applet have a main class?? if so wat is it???
2) how do i embed the applet hmtl code into the java class itself ???

im posting below the edition of the codin. plz do check and reply ASAP... THANK YOU IN ADVANCE

/*<applet code="Tower.class" width=500 height=450>
</applet>*/

import java.awt.*;
import java.awt.event.*;
import java.applet.*;
import java.util.*;

public class Tower extends Applet 
{
	public static void main(String [] arg)
	{
		
	}
   
    TowerPanel panel;
    TowerControl control;

    public void init() 
    {
    	 TowerPanel panel;
    TowerControl control;
	resize(500,450);
	setLayout(new BorderLayout());

	panel = new TowerPanel();
	add("Center", panel);
	add("South", control = new TowerControl(panel));
	
    }

    public void start()
    {
    	 

		panel.start();
    }

    public void stop()
    {
    	
  
		panel.stop();
    }
    
    
    public boolean action(Event evt, Object arg) 
    {
    	 
 
        if (arg instanceof Boolean) 
        	{
        		
            if (((Checkbox)evt.target).getLabel().equals("Reset"))
            	 {
            	 	
                panel.reset = ((Boolean)arg).booleanValue();
                
            	 }else
           		 {
           		 	
                panel.reset = ((Boolean)arg).booleanValue();
           		 }
           		 
            return true;
            
        	}
        	
        return false;
    }
}

class Towering
 {
 	
	int num_rings[] = new int[3];
	int top_size[] = new int[3];

	public Towering(int a)
	{
		num_rings[0] = a;
		num_rings[1] = 0;
		num_rings[2] = 0;
		top_size[0] = 40;
		top_size[1] = 1000;
		top_size[2] = 1000;
	}

	public void reset(int b)
	{
		num_rings[0] = b;
		num_rings[1] = 0;
		num_rings[2] = 0;
		top_size[0] = 40;
		top_size[1] = 1000;
		top_size[2] = 1000;
	}

}

class ring
 {
 	
	int ring_size[] = new int[10];
	int old_x[] = new int[10];
	int which_x[] = new int[10];
	int which_y[] = new int[10];
	int order[] = new int[10];
	int which_tower[] = new int[10];

	public ring(int a)
	{
		
	 for(int i = 0; i<a; i++)
	 	{
			ring_size[i] = 40+20*i;
			which_x[i] = 100;
			old_x[i] = which_x[i];
			which_y[i] = 400-30*(a-i);
			order[i] = a-i;
			which_tower[i] = 0;
		}
	}

	public void reset(int b)
	{
		
	 for(int i = 0; i<b; i++)
	 	{
		ring_size[i] = 40+20*i;
		which_x[i] = 100;
		old_x[i] = which_x[i];
		which_y[i] = 400-30*(b-i);
		order[i] = b-i;
		which_tower[i] = 0;
		
		}
	}
}

class TowerPanel extends Panel implements Runnable
{
	Thread going = null;
	int width = 500;
	int height = 400;
	int tower_height = 350;
	int tower_width = 20;
	int num_rings = 8;
	int pick_ring = 1000;
	int tempx;
	int tempy;
	boolean win = false;
	boolean reset;

	//special effect words
	String s = new String("Tower of Hanoi : By :- Razia Roshan");
	char separated[];
	int x_coord = 0, y_coord = 0;

	Towering towers = new Towering(num_rings);
	ring rings = new ring(num_rings);

	TowerPanel()
	{
		setFont(new Font("TimesRoman",Font.BOLD,40));
		setBackground(new Color(170,170,170));
		separated = new char [s.length()];
		s.getChars(0,s.length(),separated,0);
	}

	public void paint(Graphics g)
	{
		//special words
		for(int i=0;i<s.length();i++)
		{
		x_coord = (int) (Math.random()*10+15*i+100);
		y_coord = (int) (Math.random()*10+36);
		g.setColor(new Color(200-10*i, 10*i, 10*i));
		g.drawChars(separated, i,1,x_coord,y_coord);
		}

		//drawing those three towers
		g.setColor(Color.red);
		g.fill3DRect(90,height-tower_height, tower_width, tower_height, true);
		g.setColor(Color.blue);
		g.fill3DRect(240,height-tower_height, tower_width, tower_height, true);
		g.setColor(Color.yellow);
		g.fill3DRect(390,height-tower_height, tower_width, tower_height, true);


		//drawing all the rings
		g.setColor(Color.black);
		for(int j=0;j<num_rings;++j)
			{
			g.setColor(new Color(20*j+55,200-20*j,20*j+55));
			g.fill3DRect(rings.which_x[j]-rings.ring_size[j]/2, rings.which_y[j], rings.ring_size[j], 30, true);
			}

		//Congratulation
		if(win)
			{
			g.setColor(Color.white);
			g.drawString("Congratulation!!!",150,150);
			}

	}

	public synchronized boolean mouseDown(Event evt, int x, int y) 
	{
		for(int k=0; k<num_rings; ++k)
			{
				if(rings.order[k] == towers.num_rings[rings.which_tower[k]]) 
				{
					if((x>=(rings.which_x[k]-rings.ring_size[k]/2))&&(x<=((rings.which_x[k]-rings.ring_size[k]/2)+rings.ring_size[k])))
					{
	 					if((y>=rings.which_y[k])&&(y<=(rings.which_y[k]+30)))
	 					{
							pick_ring = k;
						}		
					}
				}
			}
		return true;
	}

	public synchronized boolean mouseDrag(Event evt, int x, int y)
	 {
		if(pick_ring!=1000)
			{
				rings.which_x[pick_ring] = x;
				rings.which_y[pick_ring] = y;
			
				//repaint(1,x-40,y-40,rings.ring_size[pick_ring]*5,200);
				repaint();
			}
		return true;
	}

	public synchronized boolean mouseUp(Event evt, int x, int y)
	 {
		if(pick_ring!=1000)
			{
			if((140>=rings.which_x[pick_ring])&&(100<=(rings.which_x[pick_ring]+rings.ring_size[pick_ring]))&&(rings.ring_size[pick_ring]<towers.top_size[0]))
				{
				  ++towers.num_rings[0];
			 	 --towers.num_rings[rings.which_tower[pick_ring]];
				  rings.which_tower[pick_ring] = 0;
				  rings.which_x[pick_ring] = 100;
				  rings.order[pick_ring] = towers.num_rings[0];
				  rings.which_y[pick_ring] = 400-30*towers.num_rings[0];
				}else if((280>=rings.which_x[pick_ring])&&(240<=(rings.which_x[pick_ring]+rings.ring_size[pick_ring]))&&(rings.ring_size[pick_ring]<towers.top_size[1]))
				{
	 		  			++towers.num_rings[1];
			  			--towers.num_rings[rings.which_tower[pick_ring]];
			  			rings.which_tower[pick_ring] = 1;
			 			 rings.which_x[pick_ring] = 250;
			 			 rings.order[pick_ring] = towers.num_rings[1];
			 			 rings.which_y[pick_ring] = 400-30*towers.num_rings[1];

				}else if((430>=rings.which_x[pick_ring])&&(390<=(rings.which_x[pick_ring]+rings.ring_size[pick_ring]))&&(rings.ring_size[pick_ring]<towers.top_size[2]))
					{
			  			++towers.num_rings[2];
			 			 --towers.num_rings[rings.which_tower[pick_ring]];
			 			 rings.which_tower[pick_ring] = 2;
			 			 rings.which_x[pick_ring] = 400;
			 			 rings.order[pick_ring] = towers.num_rings[2];
			 			 rings.which_y[pick_ring] = 400-30*towers.num_rings[2];
					}else
					{
					 	 rings.which_x[pick_ring] = rings.old_x[pick_ring];
						  rings.which_y[pick_ring] = 400-30*towers.num_rings[rings.which_tower[pick_ring]];
					}
			}
						rings.old_x[pick_ring] = rings.which_x[pick_ring];
						pick_ring = 1000;

						//recompute the to_size for all towers
						for(int z=0;z<num_rings;++z)
						{
							if(rings.order[z] == towers.num_rings[rings.which_tower[z]])
							{
								towers.top_size[rings.which_tower[z]] = rings.ring_size[z];
							}
						}

		//see if the user wins
		for(int t=0;t<3;++t)
		{
			if((t!=0)&&(towers.num_rings[t] == num_rings))
				{
				win = true;
				}
			if(towers.num_rings[t] == 0)
				{
				towers.top_size[t] = 1000;
				}
		}
		repaint();
		return true;
	}

	public void start()
	{
		if(going == null)
		{
			going = new Thread(this);
			going.start();
		}
	}

	public void stop() 
		{
			going = null;
		}

/*
	private Image offScreenImage;
	private Dimension offScreenSize;
	private Graphics offScreenGraphics;

	public final synchronized void update (Graphics g){
		Dimension d = size();
		if((offScreenImage == null) || (d.width !=offScreenSize.width) || (d.height != offScreenSize.height)) {
			offScreenImage = createImage(d.width, d.height);
			offScreenSize = d;
			offScreenGraphics = offScreenImage.getGraphics();
		}
		paint(offScreenGraphics);
		g.drawImage(offScreenImage, 0, 0, null);
	}

*/
	public void run() 
		{
			while (going!=null) 
			{
				try {Thread.sleep(100);} catch (InterruptedException e){}
				repaint(1,0,0,500,45);
				//repaint();
			}
			
	 		going = null;
		}


    public void reset(boolean filled, int num_blocks)
     {
		win = false;
		num_rings = num_blocks;
		towers.reset(num_rings);
		rings.reset(num_rings);
		repaint();
   	 }
}

class TowerControl extends Panel 
{
    TextField s;
    TextField e;
    TowerPanel pa;

    public TowerControl(TowerPanel pa) 
    {
		this.pa = pa;
		add(s = new TextField("8", 4));
		add(new Button("Reset Blocks Number"));
    }

    public boolean action(Event ev, Object arg)
    {
		if (ev.target instanceof Button)
		 {
	   		 String label = (String)arg;

	   		 pa.reset(label.equals("Reset Blocks Number"),Integer.parseInt(s.getText().trim()));

	    return true;
		}

		return false;
    }
}

[masijade]

Read that link Peter posted and/or this one.

No, an Applet does not have a main method, but you don't execute from the command line either (although you can using the appletviewer command instead of the java command).

[masijade]

no i havent got a main method in the calsses....this is an applet program..if so where should i include the main method in the class???

Well, then say it is an applet, because when you post an unformatted mess, like you did, although another mod now added the code tags, I am not even going to attempt to read it.

When you simply plop code and an error message onto the forum and don't provide anymore info, such as what you've tried to fix it, what you think the exception might mean if you don't understand it, etc, etc (IOW showing us that you are at least trying), then you are going to get answers from people taking as much thought posting them as you did posting your question. I.E. no thought what-so-ever.

If you'll notice, a link was included that explained the main method, which is what the error message was about and was so the only thing we had to go on, so I don't know what it was you had to complain about.