import java.applet.*;
public class Class2 extends Applet {
    public void init() {
	A a = new A(1);
	a.printit();
	a = new A();
	a.printit();
    }
}
class A {
	int x;
	A() { x = 42;}
	A(int v) { x = v; }
	void printit() { System.out.println("A's value is "+x); }
}

A's value is 1
A's value is 42

Source