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 26535

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

2 5512

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

10 24161

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 8422

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

5 11758

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

Infosys, Synechron,

8 15216

why marker interfaces are there in java

Digital Group,

4 9696

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

Saksoft,

1 5988

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

5 18336

What are Advatages of Overloading and Overridding.

TCS, Wipro,

8 26001

Can we declare static variables in JSP page.

TCS,

3 24232

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

IBM,

12 19831

write java code to print second max number in the array

Huawei, IBAB,

12 24476

how to call One constructor from another;

Innodata Isogen,

10 18090

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 9942

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Un-Answered Questions { Core Java }

Is oracle java 11 free?

1015

What is the difference between @before and @beforeclass annotation?

1202

What is this keyword in java?

1088

What is module in project?

1034

What is hash table in java?

1097

What are sets in java?

1007

What are the rules for naming an array?

1109

What's the purpose of static methods and static variables?

1163

What modifiers are allowed for methods in an interface?

1219

Have you ever used hashtable and dictionary?

1070

What environment variables do I need to set on my machine in order to be able to run java programs?

1063

we have syntax like for(int var : arrayName) this syntax is to find whether a number is in the array or not.but i want to know how to find that number's location.

2083

Is assembly language a low level language?

1032

What is overriding in java?

1136

What causes memory leaks in java?

985

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