OOPS concepts

To implement multiple inheritance in Java we use

• Package

• Abstract class

• Interface

• Abstract method

Abstract class can have

• Abstract methods

• Methods with code implementation

• Used to create objects

• Used to create subclasses

Hybrid inheritance and multiple inheritance is possible in Java using the concept

• Package

• Interface

• Super

• Access specifiers

Who invented Java?

• Ryan Gosling

• Bjarne Stroustrup

• James Gosling

• Guido van Rossum

int[] myArray = {11, 22, 33, 44, 55};

which code is correct to print length of above int-array?

• System.out.println(int[].myArray.length());

• System.out.println(myArray.length);

• System.out.println(myArray.length());

• System.out.println(int[].myArray.size());

The difference between static and non static method is ....

• for non static method : user need to create object in a class to call a method.

• A method is to perform only specific task.

• There is no significant differences between static and non - static method.

• Both are bounded with a class.

Assuming Point is a valid class, what would be the result of this code: Point p[] = new Point[10]; System.out.println(p[3].getX());

• 0

• Null Pointer Exception

• -999

• Index Out of Bound Error

Identifiers can start with a number. True or False?

• True

• False

Which of the following is not a Java features?

• Dynamic

• Architecture Neutral

• Object-oriented

• Use of pointers

1. class main_class

2. {

3. public static void main(String args[])

4. {

5. int y = 10;

6. if (y == 10)

7. {

8. int y = 11;

9. System.out.println(y);

10. }

11. }

12. }

• Compilation error

• 10

• 11

• Run time error