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JAVA Quiz

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Java Mastery Quiz

Test your knowledge of Java with this engaging quiz designed for programmers of all levels! Dive into 20 carefully crafted questions that cover everything from fundamental concepts to advanced programming techniques.

Are you up for the challenge? Here are some features:

Multiple choice questions
Instant scoring
Learn and reinforce your Java skills

20 Questions5 MinutesCreated by CodingWhiz321

Which class can access all public and protected methods and fields of its super class?

Super Class

Inner Class

Sub Class

Outer Class

Is HashMap thread-safe ?

Yes

Can we use Class.forName() to create object in JAVA ?

Yes

Is Runnable a part of Thread LifeCycle in Java ?

Yes

When does method overloading is determined?

Run Time

Compile Time

Coding Time

Execution

What is the state if an object has its own lifecycle and there is no owner?

Aggregation

Association

Encapsulation

Composition

What is it called where object has its own lifecycle and child object cannot belong to another parent object?

Aggregation

Association

Encapsulation

Composition

What is the return type of Constructors?

Void

Int

Float

None

Which operator is used by Java run time implementations to free the memory of an object when it is no longer needed?

Delete

Free

New

None

Which of this method of class StringBuffer is used to reverse sequence of characters?

Reverse()

Reverseall()

Reverse()

reverseAll()

Which of these is a method to clear all the data present in output buffers?

Clear()

Flush()

Close()

Clean()

Which of the following keyword is used by calling function to handle exception thrown by called function?

Throws

Throw

Try

Catch

Which of the following handles the exception when a catch is not used?

Finally

Throw handler

Default handler

Java run time system

At runtime, error is recoverable.

True

False

Which of these are legacy classes?

Stack

Array

LinkedList

None of these

Which of these methods is used to add elements in vector at specific location?

Add

Set

AddElement

Which of this method is given parameter via command line arguments?

Main()

Recursive()

Add()

System defined methods

Which of these is a method of ObjectInput interface used to deserialize an object from a stream?

Int read()

Void close()

Object readObject()

Object writeObject()

Which of these class extend InputStream class?

ObjectStream

ObjectInputStream

ObjectOutput

ObjectInput

Which of these is used to perform all input & output operations in Java?

Streams

Variables

Classes

Methods

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