Java Methods and Constructors Quiz

You’ve learned a lot, and now it’s time to test yourself with this Methods and Constructors Quiz. This is a great way to check your knowledge and skills. This quiz will help you see how much you’ve learned and identify areas you might need to review.

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1. Which of the following is true about constructor overloading?

A. Constructors cannot be overloaded

B. Overloaded constructors must have different names

C. Overloaded constructors must have different parameter lists

D. Overloaded constructors cannot call other constructors

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2. Which of the following statements is true about static blocks?

A. Static blocks are executed before the main method

B. Static blocks are executed after instance initializers

C. Static blocks are executed each time an object is created

D. Static blocks cannot throw exceptions

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3. Which of the following is true about static methods?

A. They can access instance variables directly

B. They can be called on an instance of the class

C. They belong to the class, not instances of the class

D. They can override instance methods

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4. What will be the output of the following code?

class A {
    A() {
        System.out.println(“A”);
    }
}
class B extends A {
    B() {
        System.out.println(“B”);
    }
}
class C extends B {
    C() {
        System.out.println(“C”);
    }
}
public class Main {
    public static void main(String[] args) {
        C c = new C();
    }
}

A. A B C

B. C B A

C. A C B

D. Compilation error

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5. What will be the output of the following code?

class Parent {
    Parent() {
        System.out.println(“Parent Constructor”);
    }
}
class Child extends Parent {
    Child() {
        System.out.println(“Child Constructor”);
    }
}
public class Main {
    public static void main(String[] args) {
        Child c = new Child();
    }
}

A. Parent Constructor Child Constructor

B. Compilation error

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6. Which of the following is true about the `super` keyword in Java?

A. It can be used to call the superclass's constructor

B. It can be used to call a method in the superclass

C. It can be used to access a field in the superclass

D. All of the above

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7. What is a default constructor?

A. A constructor provided by the programmer

B. A constructor that takes no parameters and is provided by the Java compiler if no other constructors are defined

C. A constructor with a default access modifier

D. A constructor that initializes all member variables to default values

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8. What will be the output of the following code?

   class A {
       void display(int a) {
           System.out.println(“Class A”);
       }
   }
   class B extends A {
       void display(double a) {
           System.out.println(“Class B”);
       }
   }
   public class Main {
       public static void main(String[] args) {
           B obj = new B();
           obj.display(5);
       }
   }

A. Class A

B. Class B

C. Compilation error

D. Runtime error

9 / 15

9. Which of the following is true about method overloading?

A. Overloaded methods must have the same parameter list

B. Overloaded methods must have the same return type

C. Overloaded methods must have different parameter lists

D. Overloaded methods must have different names

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10. What will be the output of the following code?

   class Demo {
       int x;
       Demo() {
           this(10);
           System.out.println(“Default constructor”);
       }
       Demo(int x) {
           this.x = x;
           System.out.println(“Parameterized constructor”);
       }
   }
   public class Main {
       public static void main(String[] args) {
           Demo obj = new Demo();
       }
   }

A. Default constructor

B. Parameterized constructor

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11. Which keyword is used to call a constructor from another constructor in the same class?

A. this

B. super

C. new

D. static

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12. Can a Java class have multiple constructors?

A. Yes

B. No

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13.

What will be the output of the following code?

   class Test {
       int x;
       Test(int x) {
           this.x = x;
       }
       void display() {
           System.out.println(x);
       }
   }
   public class Main {
       public static void main(String[] args) {
           Test obj = new Test(5);
           obj.display();
       }
   }

A. 0

B. 5

C. Compilation error

D. Runtime error

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14. Which of the following is true about constructors?

A. Constructors can have a return type

B. Constructors cannot be overloaded

C. Constructors are called implicitly when an object is created

D. Constructors can be called like regular methods

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15. What is the difference between a constructor and a method in Java?

A. A constructor initializes an object, and a method performs actions on objects

B. A constructor can return a value, but a method cannot

C. A constructor is called explicitly, but a method is called implicitly

D. A method initializes an object, and a constructor performs actions on objects

Your score is

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