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 26342

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

2 5419

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

10 23796

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 8212

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

5 11591

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

Infosys, Synechron,

8 14931

why marker interfaces are there in java

Digital Group,

4 9524

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 18134

What are Advatages of Overloading and Overridding.

TCS, Wipro,

8 25716

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 19380

write java code to print second max number in the array

Huawei, IBAB,

12 24035

how to call One constructor from another;

Innodata Isogen,

10 17760

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 9759

Post New Core Java Questions

Un-Answered Questions { Core Java }

Describe string intern() methodology

1063

What is identifier in java?

1113

What are the important features of Java 10 release?

985

What is the importance of main method in Java?

1057

explain different ways of using thread? : Java thread

1013

Can you explain inner class.

1088

Difference between java and javascript

1095

State the main difference between c++ and java?

1088

What is jit compiler in java?

1107

Can you declare a private method as static?

1154

What is the purpose of garbage collection in java? When is it used?

1048

What is the difference between overriding and overloading in OOPS.

1165

What is purpose of find feature?

1080

When is the finally clause of a try-catch-finally statement executed?

1070

extending thread class or implementing runnable interface. Which is better? : Java thread

999

For More Un-Answered { Core Java } Questions Click Here