SingleGC.java

class SingleGC{
    public static void main(String A[]){
        System.out.println("Inside main");

        Derived dobj = new Derived();

        System.out.println(dobj.i);
        System.out.println(dobj.j);
        System.out.println(dobj.x);

        dobj.fun();
        dobj.gun();

        dobj = null;

        System.gc();
        

        System.out.println("End of main");
     
    }
}

class Base {
    public int i;
    public int j;

    public Base(){
        System.out.println(" Inside Base Constructor");    
        this.i = 0;                         // here, use of 'this' is optional
        this.j = 0;
    }

    protected void finalize(){
        System.out.println(" Inside finalize method of Base");
    }
    
    public void fun(){
        System.out.println("Inside Base fun");
    }
}

class Derived extends Base{
    public int x;

    public Derived(){
        System.out.println(" Inside Derived Constructor");    
        this.x = 0;                         // use of this is optional
    }

    protected void finalize(){
        System.out.println(" Inside finalize method of Derived");
    }
    
    public void gun(){
        System.out.println("Inside Derived gun");
    }

}