public class Test {
    static int i; //key point
    int j;
    public static void main(String[] args) {
        Test x1 = new Test();
        Test x2 = new Test();
        x1.i = 3;
        x1.j = 4;
        x2.i = 5;
        x2.j = 6;
        System.out.println(
        x1.i + " "+
        x1.j + " "+
        x2.i + " "+
        x2.j);
    }
}

Output:5456