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check box in java


              check box with condition(if else)

import java.awt.*;
import java.applet.*;
import java.awt.event.*;
/*<applet code="Classtest" height=300 width=300>
</applet>*/
public class Classtest extends Applet implements ItemListener
{
   Checkbox c1,c2,c3;
  Canvas s1;
public void init( )
{
   c1=new Checkbox("Red");
   add(c1);
  c1.addItemListener(this);
 c2=new Checkbox("Green");
   add(c2);
  c2.addItemListener(this);
 c3=new Checkbox("Blue");
   add(c3);
  c3.addItemListener(this);
s1=new Canvas( );
s1.setSize(50,50);
add(s1);
}
public void itemStateChanged(ItemEvent ie)
{
            Color c;
            if(c1.getState()==true)
            {
                        if(c2.getState()==true)
                        {
                                    if(c3.getState()==true)
                                    {
                                                c=new Color(255,255,255);
                                                s1.setBackground(c);
                                    }
                                    else
                                    {
                                                c=new Color(255,255,0);
                                    s1.setBackground(c);
                                    }
                        }
                        else
                        {                                                                     
                                    if(c3.getState()==true)
                                    {
                                                c=new Color(255,0,255);
                                                s1.setBackground(c);
                                    }
                                    else
                                    {
                                                c=new Color(255,0,0);
                                                s1.setBackground(c);
                                    }
                                   
                        }
            }
            else
            {                     
                        if(c2.getState()==true)
                        {
                                    if(c3.getState()==true)
                                    {
                                                c=new Color(0,255,255);
                                                s1.setBackground(c);
                                    }
                                    else
                                    {
                                                c=new Color(0,255,0);
                                                s1.setBackground(c);
                                    }
                        }
                        else
            {         
                                    if(c3.getState()==true)
                                    {
                                                c=new Color(0,0,255);
                                                s1.setBackground(c);
                                    }
                                    else
                                    {
                                                c=new Color(0,0,0);
                                                s1.setBackground(c);
                        }
                        }
            }
 }        
}

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