Methods - Java Multiple Choice Questions

This section of our 1000+ Java MCQs focuses on Methods of Java Programming Language.

1. What is the return type of a method that does not return any value?
a) int
b) float
c) void
d) double
View Answer

Answer: c
Explanation: Return type of a method must be made void if it is not returning any value.

2. What is the process of defining more than one method in a class differentiated by method signature?
a) Function overriding
b) Function overloading
c) Function doubling
d) None of the mentioned
View Answer

Answer: b
Explanation: Function overloading is a process of defining more than one method in a class with same name differentiated by function signature i:e return type or parameters type and number. Example – int volume(int length, int width) & int volume(int length , int width , int height) can be used to calculate volume.

3. Which of the following is a method having same name as that of it’s class?
a) finalize
b) delete
c) class
d) constructor
View Answer

Answer: d
Explanation: A constructor is a method that initializes an object immediately upon creation. It has the same name as that of class in which it resides.

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4. Which method can be defined only once in a program?
a) main method
b) finalize method
c) static method
d) private method
View Answer

Answer: a
Explanation: main() method can be defined only once in a program. Program execution begins from the main() method by java runtime system.

5. Which of this statement is incorrect?
a) All object of a class are allotted memory for the all the variables defined in the class
b) If a function is defined public it can be accessed by object of other class by inheritation
c) main() method must be made public
d) All object of a class are allotted memory for the methods defined in the class
View Answer

Answer: d
Explanation: All object of class share a single copy of methods defined in a class, Methods are allotted memory only once. All the objects of the class have access to methods of that class are allotted memory only for the variables not for the methods.

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6. What will be the output of the following Java program?

```
    class box 
```
```
    {
```
```
        int width;
```
```
        int height;
```
```
        int length;
```
```
        int volume;
```

        void volume(int height, int length, int width)

```
        {
```

             volume = width*height*length;

```
        } 
```
```
    }    
```
```
    class Prameterized_method
```
```
    {
```

        public static void main(String args[])

```
        {
```
```
            box obj = new box();
```
```
            obj.height = 1;
```
```
            obj.length = 5;
```
```
            obj.width = 5;
```
```
            obj.volume(3,2,1);
```

            System.out.println(obj.volume);

```
        } 
```
```
     }
```

a) 0
b) 1
c) 6
d) 25
View Answer

Answer: c
Explanation: None.
output:

$ Prameterized_method.java
$ Prameterized_method
6

7. What will be the output of the following Java program?

```
    class equality 
```
```
    {
```
```
        int x;
```
```
        int y;
```
```
        boolean isequal()
```
```
        {
```
```
            return(x == y);  
```
```
        } 
```
```
    }    
```
```
    class Output 
```
```
    {
```

        public static void main(String args[])

```
        {
```

            equality obj = new equality();

```
            obj.x = 5;
```
```
            obj.y = 5;
```

            System.out.println(obj.isequal());

```
        } 
```
```
    }
```

a) false
b) true
c) 0
d) 1
View Answer

Answer: b
Explanation: None.
output:

$ javac Output.java
$ java Output 
true

8. What will be the output of the following Java program?

```
    class box 
```
```
    {
```
```
        int width;
```
```
        int height;
```
```
        int length;
```
```
        int volume;
```
```
        void volume() 
```
```
        {
```

             volume = width*height*length;

```
        } 
```
```
    }    
```
```
    class Output 
```
```
    { 
```

        public static void main(String args[])

```
        {
```
```
            box obj = new box();
```
```
            obj.height = 1;
```
```
            obj.length = 5;
```
```
            obj.width = 5;
```
```
            obj.volume();
```

            System.out.println(obj.volume);

```
        } 
```
```
    }
```

a) 0
b) 1
c) 25
d) 26
View Answer

Answer: c
Explanation: None.
output:

$ javac Output.java
$ java Output
25

9. In the following Java code, which call to sum() method is appropriate?

```
class Output 
```
```
{
```
```
 
```
```
        public static int sum(int ...x)
```
```
        {
```
```
             return; 
```
```
        }
```

        static void main(String args[])

```
        {    
```
```
             sum(10);
```
```
             sum(10,20);
```
```
             sum(10,20,30);
```
```
             sum(10,20,30,40);
```
```
        } 
```
```
}
```

a) only sum(10)
b) only sum(10,20)
c) only sum(10) & sum(10,20)
d) all of the mentioned
View Answer

Answer: d
Explanation: sum is a variable argument method and hence it can take any number as an argument.

10. What will be the output of the following Java program?

```
    class area 
```
```
    {
```
```
        int width;
```
```
        int length;
```
```
        int volume;
```
```
        area() 
```
```
        {
```
```
           width=5;
```
```
           length=6;
```
```
        }
```
```
        void volume() 
```
```
        {
```

             volume = width*length*height;

```
        } 
```
```
    }    
```
```
    class cons_method 
```
```
    {
```

        public static void main(String args[])

```
        {
```
```
            area obj = new area();
```
```
            obj.volume();
```

            System.out.println(obj.volume);

```
        } 
```
```
    }
```

a) 0
b) 1
c) 30
d) error
View Answer

Answer: d
Explanation: Variable height is not defined.
output:

$ javac cons_method.java
$ java cons_method
error: cannot find symbol height

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