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Java Interview Questions and Answers

Java Generics

Explain the use of Generics in Java.

Can we use Generics with multiple type parameters?

Explain Generics with Bounded Types.

Explain Generics with WildCard Arguments.

Explain Generics using Bounded WildCards.

How can we create Generic method in Java?

How can we create Generic constructor in Java?

 

Garbage Collection

Explain Garbage Collection in Java.

 

Call by value & call by reference in Java

Explain the difference between call by value & call by reference in Java.

 

Auto Boxing & Unboxing

Explain Auto Boxing & Unboxing.

 

this Keyword

Explain this Keyword in Java.

 

Abstract Class

Explain Abstract class in Java.

 

Java Interfaces

Explain Interfaces in Java.

What is default interface method in Java?

 

Java Exception Handling

What is Exception Handling in Java?

Explain Multiple Catch Clauses in Java.

Explain Try with Resources in Java.

 

Java Multithreading

What is Multithreading in Java?

What is preemptive & non-preemptive multitasking in Java?

Explain Thread Life Cycle in Java.

What is Thread Scheduler in Java?

What are the ways to create a thread in Java?

Explain join() method in Java?

Explain sleep() method in Java?

How & when a thread can be interrupted?

Explain Thread Synchronization in Java.

Explain Inter Thread Communication in Java.

 

Java String

What is a String in Java?

What are the String Method in Java?

 

Java Inner Classes

What is Inner Class in Java?

 

Java Object & Class

What is the difference between an Object & the Class in Java?

What is an instance variable in Java?

What is the static member in Java?

 

Java Collection Framework

What is the collection framework in Java?

What is the difference between Collection & Map in Java?

 

Java Control Statements

How if-else control statement Works.

Explain the working of for loop.

Explain the working of while loop.

Explain the working of do-while loop.

What is a nested loop?

Explain the working of break statement?

Explain the working of continue statement?

Explain the working of switch statement?

 

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