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 26343

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

2 5422

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

10 23802

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 8213

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

5 11593

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

Infosys, Synechron,

8 14933

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 5901

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

5 18136

What are Advatages of Overloading and Overridding.

TCS, Wipro,

8 25721

Can we declare static variables in JSP page.

TCS,

3 24078

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

IBM,

12 19398

write java code to print second max number in the array

Huawei, IBAB,

12 24040

how to call One constructor from another;

Innodata Isogen,

10 17765

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 9764

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Un-Answered Questions { Core Java }

Do loops java?

1019

Who found java?

981

Difference between abstract and concrete class ?

1178

What are desktop procedures?

1045

what is session in java?

1248

Highest level event class of the event-delegation model?

4015

What is the difference between an inner class and a sub-class?

1018

Do I need java on my pc?

1051

How destructors are defined in java?

1191

Can we call virtual funciton in a constructor ?

2203

What is string builder in java?

1016

What are sets in java?

948

What is the relationship between class and object?

1046

What is outofmemoryerror in java?

1026

Is set thread safe java?

925

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