to print pattern

**Charanleen** · September 29th, 2010, 08:54 AM

I got a question in a java quiz which is to Print the Pattern shown below but i could not crack...need ur help in this

NITIN
I I
T T
I I
NITIN

i did it by using charAt but it printed all like..
NITIN
I
T
I
N
I
T
I
N
.
.
.
and so on can u please give me some idea to do so

**copeg** · September 29th, 2010, 09:07 AM

Please share the code you have

**Charanleen** · October 2nd, 2010, 05:28 AM

Thanks for ur soon reply sir, that was a mini problem and by Gods Grace i am solving that but this which i am going to post is simply unbreakable for me...i was making a ball game using applet but keyListener is not working...i want to move my plate using keys but there is a big halt...

import java.awt.event.*;
import java.awt.*;
import java.applet.*;
/*
<applet code="moveball" width=500 height=500>
</applet>
*/
 
 public class moveball  extends Applet implements KeyListener,Runnable
{
 int p=0,q=0,dp = 3, dq = 3; Thread t;
 boolean left,right;
 
 
 public void init()
 {
   addKeyListener(this);
   setBackground(Color.cyan);
 
 }
 
 
 public void keyPressed(KeyEvent k)
 {
 
 
  switch(k.getKeyCode())
   {
     case KeyEvent.VK_LEFT:
     left = true;showStatus("Key pressed left");
     break;
 
     case KeyEvent.VK_RIGHT:
     right = true;showStatus("Key pressed right");
     break;
   }
 
 
 } 
 
 
 public void keyReleased(KeyEvent k)
 {
 
 
   switch(k.getKeyCode())
    {
    case KeyEvent.VK_LEFT:
    left = false;showStatus("Key released left");
    break;
 
    case KeyEvent.VK_RIGHT:
    right = false;showStatus("Key released right");
    break;
    }
 
 
 } 
 
 
 public void keyTyped(KeyEvent k)
 {
  showStatus("Key Typed");
 } 
 
 
 
 public void start()
 {
  t= new Thread(this,"Demo");
  t.start();
 }
 
 
 public void run()
 {
 for(;;)
  {
   try
  {
   repaint(); 
  Thread.sleep(10);
  }catch(InterruptedException e){}
 
  }
 
 }
 
 
 public void paint(Graphics g)
 { 
  Dimension d = this.getSize();
 
  int u=d.width/2,v=d.height-10,up=15;
 
  g.fillRect(u,v,40,6);
 
  if(left==true && u>0)
   {
    u-=up;
   }
 
   if(right==true && u<d.width)
   {
    u+=up;
   }
  g.fillRect(u,v,40,6);
 
  g.fillOval(p,q,16,16);
  p += dp;
  q += dq;
 
 
   if (p < 0)
   {
     p = 0;
     dp = -dp;
   }
 
   if (p  >= d.width)
   {
      p = d.width ;
      dp = -dp;
   }
 
   if (q < 0)
   {
      q = 0;
      dq = -dq;
   }
 
   if (q  >= d.height )
   {
      q = d.height ;
      dq = -dq;
   }
 
    g.fillOval(p, q, 16, 16); 
 
 
 } 
}

**Norm** · October 2nd, 2010, 07:56 AM

but there is a big halt.

Why is there a halt? What variables control the movement of the ball? Are those variables being changed as you want?

Try debugging your code by adding print outs to show the values of the variables as they are changed and as they are used. You should be able to see where they are being changed incorrectly and correct it so the ball moves as you want it to.

**Charanleen** · October 2nd, 2010, 09:34 AM

ball is moving correctly but the plate at which it should strike is not ....if it doesn't move i won't be able to write the striking condition of ball onto the plate ...

but that was a good idea to add SOP statements.. i'll just do it and let u know it worked or not..thanks..

**Norm** · October 2nd, 2010, 09:55 AM

Also I notice you have two booleans: left and right for controlling the movement.
Can they both be true? The code in the paint method looks like it expects that. Otherwise the test for right would be in an else if

Does your applet have focus? It needs it for the keylistener. Click on the applet to give it focus while testing

**Charanleen** · October 3rd, 2010, 02:37 AM

Originally Posted by Norm

Also I notice you have two booleans: left and right for controlling the movement.
Can they both be true? The code in the paint method looks like it expects that. Otherwise the test for right would be in an else if

Does your applet have focus? It needs it for the keylistener. Click on the applet to give it focus while testing

Sir would you please check it by executing Key Listeners are now Ok(thanks for that) but the plate is having chaos

..would you please take a look

 
import java.awt.event.*;
import java.awt.*;
import java.applet.*;
/*
<applet code="moveball" width=500 height=600>
</applet>
*/
 
 public class moveball  extends Applet implements KeyListener,Runnable
{
 int p=0,q=0,dp = 3, dq = 3; Thread t;
 boolean left=false,right=false;
 
 
 public void init()
 {
   addKeyListener(this);
   setBackground(Color.cyan);
 
 }
 
 
 public void keyPressed(KeyEvent k)
 {
  System.out.println("pressed");
 
  switch(k.getKeyCode())
   {
     case KeyEvent.VK_LEFT:
     left = true;showStatus("Key pressed left");
     break;
 
     case KeyEvent.VK_RIGHT:
     right = true;showStatus("Key pressed right");
     break;
 
 
 
   }
 
 
 } 
 
 
 public void keyReleased(KeyEvent k)
 {
   System.out.println("released");
 
   switch(k.getKeyCode())
    {
    case KeyEvent.VK_LEFT:
    left = false;showStatus("Key released left");
    break;
 
    case KeyEvent.VK_RIGHT:
    right = false;showStatus("Key released right");
    break;
    }
 
 
 } 
 
 
 public void keyTyped(KeyEvent k)
 {
  showStatus("Key Typed");
 } 
 
 
 
 public void start()
 {
  t= new Thread(this,"Demo");
  t.start();
 }
 
 
 public void run()
 {
 for(;;)
  {
   try
  {
   repaint(); 
   Thread.sleep(3);
  }catch(InterruptedException e){}
 
  }
 
 }
 
 
 public void paint(Graphics g)
 { 
    Dimension d = this.getSize();
 
    int u=d.width/2,v=d.height-10,up=15;
 
    g.fillRect(u,v,40,6);
 
    while(left==true && u>0)
    {u-=up; g.fillRect(u,v,40,6);}
 
    while(right==true && u<d.width)
    {u+=up; g.fillRect(u,v,40,6);}
    g.fillRect(u,v,40,6);
 
  g.fillOval(p,q,16,16);
  p += dp;
  q += dq;
 
 
   if (p < 0)
   {
     p = 0;
     dp = -dp;
   }
 
   if (p  >= d.width)
   {
      p = d.width ;
      dp = -dp;
   }
 
   if (q < 0)
   {
      q = 0;
      dq = -dq;
   }
 
   if (q  >= d.height )
   {
      q = d.height ;
      dq = -dq;
   }
 
    g.fillOval(p, q, 16, 16); 
 
 
 } 
}

**Norm** · October 3rd, 2010, 07:20 AM

the plate is having chaos

Please describe what the plate is doing.
Try debugging your code by adding print outs to show the values of the variables as they are changed and as they are used. You should be able to see where they are being changed incorrectly and correct it so the plate moves as you want it to.

Please put posted code in code tags. Info here: Java Forums - BB Code List

**Charanleen** · October 3rd, 2010, 07:32 AM

the plate should move left every time i press left key and right when i press right key by 3 units but when i press left or right key the plate just lengthens till the end of applet window i.e. if plate is at the center and i press "->" the plate will not move but instead its length increases till the last point of window but i want whenever i press that key the plate should move by 3 and remain there until i move it again.

**Norm** · October 3rd, 2010, 07:54 AM

Try debugging your code by adding print outs to show the values of the variables as they are changed and as they are used. You should be able to see where they are being changed incorrectly and correct it so the plate moves as you want it to.

YOU need to see what the code is doing. Print out the values to see why it is doing what it is doing.

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