public class Exchange {
    public static void main(String[] args) {
        int a = 1234;
        int b = 99;
        int t = a; 
        a = b;     
        b = t;     
        System.out.println("a = " + a); // a = 99
        System.out.println("b = " + b); // b = 1234
    }
}