HOW TO EXCHANGE TWO VARIABLES IN FUNCTION?

[dyingsky]

hello,i am a java novice ,now i meet a problem:
how to exchange two variables in function?
in c++, we can use the point to do this,just like that:
//c++ programme
void exchange(int *a,int *b)
{
int temp=*a;
*a=*b;
*b=temp;
}
int x=3,y=5;
exchange(x,y);
then the values of x and y have exchanged,but how can reach this effect in java ?
thanks!!

[sherinetresa]

i think this code will help

public class exchange
{
int a,b;
exchange(int s,int r)
{
a=s;b=r;
}
public void change()
{
int temp=a;
a=b;
b=temp;

}
public static void main(String args[])
{
exchange e1=new exchange(20,30);
System.out.print("\n Before exchange");

System.out.print("\n a:"+e1.a);
System.out.print("\n b:"+e1.b);
e1.change();
System.out.print("\n After exchange ");
System.out.print("\n a:"+e1.a);
System.out.print("\n b:"+e1.b);
}
}

regards,
sherine

[dyingsky]

thanks for sherine's reply,your answer is right
but ,if there are many numbers i want to exchange,and i don't know which will be exchange firstly,which will next, how to exchange these numbers?
for example : a=1,b=2,c=3,d=4,e=5;
i want to exchange a and b firstly, then exchange c and d,then exchange e and a , …… , and so on
i want to do these in a function,how to do this?
thanks again!