Oops moment/1

Which keyword is used to inherit a class in Java?

• Implements

• Inherits

• Extends

• Super

Which is the correct way to create an object of class Dog?

• Dog d = Dog();

• Dog d = new Dog;

• Dog d = new Dog();

• Dog = new d();

Which keyword refers to the current object?

• this

• super

• final

• extends

What does method overloading mean?

• Using multiple classes

• Creating methods with same name but different parameters

• Calling one method from another

• Using one method in multiple classes

What keyword is used to call a parent class constructor?

• parent

• this

• extends

• super

What does the final keyword do when applied to a class?

• It prevents inheritance

• It allows only static methods

• It makes the class abstract

• It allows method overriding

class Animal {

void sound() {

System.out.println("Animal sound");

}

}

class Dog extends Animal {

void sound() {

System.out.println("Bark");

}

}

public class Main {

public static void main(String[] args) {

Animal a = new Dog();

a.sound();

}

}

• Animal sound

• Bark

• Error

• Nothing

class A {

int x = 5;

}

class B extends A {

int x = 10;

void print() {

System.out.println(super.x);

}

}

public class Main {

public static void main(String[] args) {

B obj = new B();

obj.print();

}

}

• 5

• 10

• Error

• Null

public class Main {

public static void main(String[] args) {

String str = "One" + 1 + 2 + 3;

System.out.println(str);

}

}

• One123

• One6

• 6One

• Error

Which of the following is TRUE about static methods in Java?

• They can access instance variables directly

• They must be called using an object

• They can be called without creating an object

• They are automatically abstract