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

Core Java Interview Questions

Questions Answers Views Company eMail

1.what is the exact difference between applet and frame? 2.Do we use main method in frames?

5 26349

diff between abstract methods and interfaces with programing (code) example?

2 5427

Is it compulsory to have atleast one abstract method in abstract class?

10 23807

public class Garbage { int a=0; public void add() { int c=10+20; System.out.println(c); System.out.println(a); } public static void main(String args[]) { Garbage obj=new Garbage(); System.gc(); System.out.println("Garbage Collected"); obj.add(); } } Above is a code in java used for garbage collection. object obj has been created for the class Garbage and system.gc method is called. Then using that object add method is called.System.gc method if called the obj should be garbage collected?

6 8217

Why cant we define System.out.println() inside a class directly?

5 11597

If all the methods in abstract class are declared as abstract then what is difference between abstract class and in interface?

Infosys, Synechron,

8 14937

why marker interfaces are there in java

Digital Group,

4 9526

How to validate the request (Eg:user name and password) in session(http session)? not in LDAP server ?

Saksoft,

1 5905

In C we use only compiler. Why java uses both compiler and interpreter? What is its significance?

5 18143

What are Advatages of Overloading and Overridding.

TCS, Wipro,

8 25727

Can we declare static variables in JSP page.

TCS,

3 24081

wHAT IS DEFAULT SPECIFIER IN JAVA wHAT IS DEFAULT CONSTRUCTOR IN JAVA wHAT IS DEFAULT METHOD IN JAVA

IBM,

12 19416

write java code to print second max number in the array

Huawei, IBAB,

12 24059

how to call One constructor from another;

Innodata Isogen,

10 17774

Write java code to print "Hello how are you" Thread1 should have "Hello" Thread2 should have "how are you" both the threads should start at the same time

Huawei,

4 9769

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Un-Answered Questions { Core Java }

What is keyset in java?

1083

What is private static class in java?

1020

What restrictions are placed on method overloading in java programming?

1053

Can we use string in switch case in java?

1058

What are the 7 types of characters?

1081

Can an integer be null java?

1011

What does substring mean?

979

List some important characteristics on jre

1076

What is space character in java?

1113

What is the java idl system?

1048

What are the methods available in a class?

1083

What is boolean used for?

1038

What is the use of 'super' keyword inside a constructor?

976

What is java’s garbage collected heap?

982

Is java same as core java?

1103

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