Quiz 5

What will be the output of the following code?

public class Tester {

 

        public static void main(String[] args) {

               Tester tester = new Tester();

               tester.evaluate(4, 2.5f);

        }

 

        public void evaluate(int a, int b) {

               System.out.print("First evaluate method invoked");

               System.out.println(a + b);

        }

 

        public void evaluate(float a, float b) {

               System.out.print("Second evaluate method invoked");

               System.out.println(a + b);

        }

}

• First evaluate method invoked 6

• Second evaluate method invoked 6.5

• Compilation error as two methods with same name cannot exist in the same class

• First evaluate method invoked 6.5

What is the output of the following code?

public class Tester {

        public static void main(String[] args) {

               Tester tester = new Tester();

               tester.evaluate(4.5, 2.5);

        }

 

        public void evaluate(int a, int b) {

               System.out.print("First evaluate method invoked");

               System.out.println(a + b);

        }

 

        public void evaluate(float a, float b) {

               System.out.print("Second evaluate method invoked");

               System.out.println(a + b);

        }

}

• Second evaluate method invoked 7.0

• Compilation error : The method evaluate(int, int) in the type Tester is not applicable for the arguments (double, double)

• Second evaluate method invoked 6.0

• First evaluate method invoked 6

Which of the following are overloaded methods?

a. public void add(int a, int b) { }

    public void add(float a, float b, float c) { }

b. public int add(int a, int b, int c) { }

    public float add(int a, int b, int c) { }

c. public float add(float a, int b) { }

    public float add(int a, float b) { }

• Only a

• Only a and c

• All a, b and c

• Only a and b

Which among the following best describes encapsulation?

• one It is a way of combining various data members into a single unit

• It is a way of combining various member functions into a single unit

• It is a way of combining various data members and member functions into a single unit which can operate on any data

• It is a way of combining various data members and member functions that operate on those data members into a single unit

Encapsulation is also called as?

• Data Hidding

• Data Hiding

• Data Encapsulation

• None of the above

Encapsulation is implemented by using__________

• public

• private

• defalut

• protected

If data members are private, what can we do to access them from the class object?

• Create public member functions to access those data members

• Create private member functions to access those data members

• Create protected member functions to access those data members

• Private data members can never be accessed from outside the class

Which feature comes under compile time polymorphism?

• Method overloading

• Constructor overloading

• Method overriding

• Both A and B

In below java code, whose “Car” will be called?

class Father {

public void car()

{

System.out.println("Father's Car");

}

}

class Son extends Father {

public void car() {

System.out.println("Son's Car");

}

}

public class Sample {

public static void main(String[] args)

{

Son john = new Son();

john.car();

}

}

• Father’s Car

• Son’s Car

• There is an ambiguity, so no one Car

• Compiler Error

The encapsulation is achieved by combining which ones into a class?

• Methods and Attribute

• Methods and Object

• Object and Attribute

• None of the above