public class StaticTest {
 
    // instance variable -- one copy for every StaticTest instance
    private int x = 0;
    
    // static variable -- one copy for the entire class (not per instance)
    private static int y = 0;
    
    public StaticTest() {
        x++;
        y++;
        System.out.println("x is " + x);
        System.out.println("y is " + y);
    }
    
    public static void main(String[] args) {
        StaticTest t1 = new StaticTest();
        StaticTest t2 = new StaticTest();
        StaticTest t3 = new StaticTest();
    }
    
}