Software

What is a Type Wrapper or simply a Wrapper in Java?

A Wrapper class is an object version of Primitive Data Type

A Wrapper provides additional methods for ease of use

Wrapper types are useful for using with generic collections

All the above

What will be the output of the following Java program?

a. True false true

b. False false false

c. False true true

d. True true false

What will be the output of the following Java program?

a. 257.0

b. 0

c. 257

D. 1

Choose the correct statement about Character wrapper class in Java?

a. Character class has static methods toUpperCase(char), toLowerCase(char)

Character class has static methods isDigit(char), isLetter(char)

Character class has static method valueOf(char) to convert char to Character.

All the above

Standard output variable ‘out’ is defined in which class?

Void

Runtime

Process

System

Which of these method of class String is used to remove leading and trailing whitespaces?

Trim()

StartsWith()

DoTrim()

What will be the output of the following Java program?

Hewlo

Hello

Hewwo

Helwo

What will be the output of the following Java program?

Hello

Worl

World

Hell

What will be the output of the following Java program?

4 9

5 8

5 9

4 8

What will be the output of the following Java code?

True

False

Which of the following class definitions defines a legal abstract class?

Class A { abstract void unfinished() { } }

Class A { abstract void unfinished(); }

Public class abstract A { abstract void unfinished(); }

abstract class A { abstract void unfinished(); }

Public class School{ public abstract double numberOfStudent(); } which of the following statements is true?

The method numberOfStudent() in class School must have a body.

The keywords public and abstract cannot be used together.

Class School must be defined abstract.

You must add a return statement in method numberOfStudent().

Why do we need to handle exceptions?

To prevent abnormal termination of program

To avoid syntax errors

To encourage exception prone program

To save memory

Which is the universal exception handler class?

Object

Errors

Exceptions

Math

Java Compiler translates the source code into?

JVM code

Machine code

Assembly code

Byte code

What does polymorphism in OOPs mean?

Concept of keeping things in different modules/files

Concept of allowing overriding of functions

Concept of wrapping things into a single unit

Concept of hiding data

Which concept allows you to reuse the written code?

Abstraction

Polymorphism

Inheritance

Encapsulation

Which of the following statements regarding abstract classes are true?

A subclass can override a concrete method in a superclass to declare it abstract.

A subclass of a non-abstract superclass can be abstract

An abstract class can be extended

All of the above

Which of these can be used to fully abstract a class from its implementation?

Objects

Packages

Interfaces

None of the Mentioned

Software

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