import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;


public class sample extends MIDlet 
{
    static int a=10,b=20;
    
    public void startApp()
    {
        swap(a,b);
        System.out.println("a :"+a);
        System.out.println("b :"+b);           
    }    
    public void pauseApp()
    {
    }
    public void swap(int a,int b)
    {       
        int t=a;
            a=b;
            b=t;
    }
    public void destroyApp(boolean unconditional) 
    {
    }
}

 public void swap(sample s)
    {       
             int t=s.a;
            s.a=s.b;
           s.b=t;
    }