OOPs Quiz - Advanced

What is the output of the following code? class Test { int x; Test(int x) { this.x = x; } void print() { System.out.println(x); } } Test t = new Test(5); t.print();

• 5

• 0

• Error

• null

Which keyword is used to call a superclass constructor?

• this

• super

• extends

• base

What is the output of the following code? class A { A() { System.out.println("A's Constructor"); } } class B extends A { B() { System.out.println("B's Constructor"); } } new B();

• B's Constructor

• A's Constructor

• A's Constructor B's Constructor

• Error

Which of the following can be overloaded?

• Constructors

• Static methods

• Main method

• All of the above

What is the role of a constructor in Java?

• Initialize objects

• Destroy objects

• Create classes

• Run threads

Which of these is NOT true about abstract classes?

• Can have abstract and non-abstract methods

• Can be instantiated

• Can have constructors

• Can have static methods

Which keyword is used to prevent inheritance?

• private

• static

• final

• const

Which is the correct way to call a static method?

• object.method()

• method()

• ClassName.method()

• this.method()

What is the output? class Test { static int count = 0; Test() { count++; } public static void main(String[] args) { new Test(); new Test(); System.out.println(Test.count); } }

• 1

• 2

• 0

• Error

Which method is called when an object is created?

• main()

• start()

• constructor

• run()