Overloading and overriding Interview Example Code

 class Test {

    static int s = 4;
    final int d = 5;

    static void sit() {
        System.out.println(" sit method of  test class ");
    }

    void get() {
        System.out.println("  get method test class");

    }
}

class Test1 extends Test {
    static int s = 6;
    static int a = 2;
    final int d = 3;

    static void sit() {
        System.out.println("sit  method test1 class");
    }

    void get() {

        System.out.println("get  method get test1 class");
    }
}

class Test2 extends Test1 {
    static int s = 7;

    static void sit() {
        System.out.println("sit method test2 class");
    }

    void get() {
        System.out.println("get  method get test2 class");
    }

}

class Demo {
}

public class HelloWorld {
    public static void main(String[] args) {
        System.out.println("1 : test2 class instance of test2 class.......... ");
        System.out.println();
        Test2 obj2 = new Test2();
        //class c inherit static 
        System.out.println("static varialble : " + obj2.a); // 2
        System.out.println();

        System.out.println("final varibale : " + obj2.d); //3
        System.out.println();

        obj2.sit();//print method of test2 class 

        System.out.println();
        System.out.println();

        System.out.println("2 : test1 class instance of test2 class.......... ");
        System.out.println();
        Test1 obj1 = new Test2();

        obj1.sit();// print method of class test1 : static method
        System.out.println();


        obj1.get();//print method of class test2 :non static method
        System.out.println();


        //testing the type cast 
        Test objtrail1 = new Test1();//correct
        Test objtrail2 = new Test2();//correct

        // Test1 cannot be converted to Test2
        //     Test2 objtrail3=new Test1();//incorrect type cast error 

        // incompatible types: Test cannot be converted to Test2
        //    Test2 objtrail3=new Test();//incorrect type cast error


        //    Test1 obje=new Test();//error: incompatible types: Test cannot be converted to Test1

        System.out.println();
        System.out.println();
        System.out.println("3 : test class instance of test1 class.......... ");

        Test obje = new Test1();//the instance of test1 but print the static and final variable and static method of test
        System.out.println();

        System.out.println("print the static  variable of test class  " + obje.s);//4
        System.out.println();

        System.out.println("print the final  variable of test  class " + obje.d);//5
        System.out.println();

        obje.sit();//print the method of static test class 
        System.out.println();

        obje.get();//print method of non static test1 class

        System.out.println();


        //    System.out.println("3 : test2 class instance of test class.......... "); 


        // Test2 objet=new Test();

        // objet.sit();//error: incompatible types: Test cannot be converted to Test2
        //    Test2 objet=new Test1();//error: incompatible types: Test1 cannot be converted to Test2


        //    Test s=new Demo();//error: incompatible types: Demo cannot be converted to Test
    }
}

output :  

1 : test2 class instance of test2 class.......... 

static varialble : 2

final varibale : 3

sit method test2 class


2 : test1 class instance of test2 class.......... 

sit  method test1 class

get  method get test2 class



3 : test class instance of test1 class.......... 

print the static  variable of test class  4

print the final  variable of test  class 5

 sit method of  test class 

get  method get test1 class