Test Preparation on JAVA Test Prep. - Java Environment & OOPS Concepts

Which of the following is not OOPS concept in Java?

1Inheritance
2Encapsulation
3Polymorphism
4Compilation

Explanation: There are 4 OOPS concepts in Java. Inheritance, Encapsulation, Polymorphism and Abstraction.

Which of the following is a type of polymorphism in Java?

1Compile time polymorphism
2Execution time polymorphism
3Multiple polymorphism
4Multilevel polymorphism

Explanation: There are two types of polymorphism in Java. Compile time polymorphism (overloading) and runtime polymorphism (overriding).

When does method overloading is determined?

1At run time
2At compile time c) At coding time
3At coding time
4At execution time

Explanation: Overloading is determined at compile time. Hence, it is also known as compile time polymorphism.

When Overloading does not occur?

1More than one method with same name but different method signature and different number or type of parameters
2More than one method with same name, same signature but different number of signature
3More than one method with same name, same signature, same number of parameters but different type
4More than one method with same name, same number of parameters and type but different signature

Explanation: Overloading occurs when more than one method with same name but different constructor and also when same signature but different number of parameters and/or parameter type.

Which concept of Java is a way of converting real world objects in terms of class?

1Polymorphism
2Encapsulation
3Abstraction
4Inheritance

Explanation: Abstraction is the concept of defining real world objects in terms of classes or interfaces.