Core Java Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

Core Java Interview Questions

Questions Answers Views Company eMail

whether java is fully object oriented language or partially object oriented language

Infosys, ME, SMK,

4 8661

while creating thread why we extend thread class

2 5085

How HashMap implemented in java? how it internally works when values are added or searched from hashMap?What is the difference betweenthe implementation of hashmap and Linked Hashmap?

IBM,

3 10841

what is mean by synchronization?

BOB Technologies, GCPL,

3 6698

what is mean by thread lock?

Infosys, TCS,

2 6577

I declared main() method as private. But it still running and displaying the output. Please Answer it . Code Snippet as Below: import java.io.*; class over { private static void main(String[] args) { int high = Integer.MAX_VALUE; int overflow = high + 1; int low = Integer.MIN_VALUE; int underflow = low - 1; System.out.println(high + "\n" +overflow +"\n"+ low +"\n"+underflow); //System.out.println(overflow); //System.out.println(low); //System.out.println(underflow); } }

Cap Gemini,

4 7615

Hi Every One I Have Small Doubt Please answer This???????????????????????????? I Want to use AbstractList class methods(java.util.AbstractList) My Program is import java.util.*; class DemoOne extends AbstractList { public static void main(String[] args) { AbstractList a=new DemoOne();//This One is Correct?? DemoOne a1=new DemoOne();//This One is Correct?? Both Are Not Working System.out.println("Hello World!"+a); System.out.println("Hello World!"+a1); } } Error IS: DemoOne.java:2: DemoOne is not abstract and does not override abstract method get(int) in java.util.AbstractList class DemoOne extends AbstractList AnyOne can Please Provide The Solution????????????????????????? Plzzzzzzz

3 4947

how system.out.println() works?

2 5261

In Inheritance if we are implementing Multi level inheritance and all class having same name of variable and now i want to access each class variable and how it is possible?

2 5162

What is the alternate of 'Inheritance' ?

CybAge, HCL,

4 14097

explain how many oops concepts available in java with realtime scenarios?

TCS,

1 14327

int a=1,b=10; System.out.println(a+b--);

HCL,

12 17707

1) Find the Merge point of two linked lists. 2) Swap two bits of integer. 3) Reverse individual words of the sentence. 4) Reverse string without using temp string.

HCL,

2 6679

what is object slice?

2163

why did you choose your career in IT?

LIC,

1 3878

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Un-Answered Questions { Core Java }

What is a literal coding?

1067

How to compare two strings in java program?

1104

Why we cannot override static method?

1123

What is the main difference between java platform and other platforms?

1177

how to convert Java project into Maven ?

1107

What is the meaning of flag day?

1082

What does int [] mean in java?

1093

Can java arraylist hold different types?

1152

os is developed in c no java is more secured then c na why dont the os developed is developed using java

4306

Can we extend singleton class?

1000

What is difference between iterator and enumeration in java?

1037

Which method cannot be overridden in java?

1043

What is member in java?

1116

why java uses class level type casting ?

2703

What is object cloning in Java?

1150

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