public class ThisUsage {
    int id;

    ThisUsage(int i) {
        this.id = i;// access and initialize field from the constructor
    }

    ThisUsage() {
        this(1);// invoke the constructor with one parameter.
    }

    public static void main(String[] args) {
        ThisUsage tu = new ThisUsage();
        ThisUsage tu2 = new ThisUsage(2);
        System.out.println("If no id provided, the default id is-->" + tu.id);
        System.out.println("otherwise, print the user-defined id -->" + tu2.id);
    }
}