Swap two number using third variable.

// main class
public class swap
{
// void main function
public static void main(String[] args)
{
//variable declaration
int a,b,temp;
a=10;
b=20;
//by this method number would swap
temp=a;
a=b;
b=temp;
// print method
System.out.println("b="+b);
System.out.println("a="+a);
}
}