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 26175

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

2 5308

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

10 23448

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 7994

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

5 11387

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

Infosys, Synechron,

8 14695

why marker interfaces are there in java

Digital Group,

4 9361

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

Saksoft,

1 5822

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

5 17959

What are Advatages of Overloading and Overridding.

TCS, Wipro,

8 25447

Can we declare static variables in JSP page.

TCS,

3 23928

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

IBM,

12 18970

write java code to print second max number in the array

Huawei, IBAB,

12 23635

how to call One constructor from another;

Innodata Isogen,

10 17400

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 9603

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Un-Answered Questions { Core Java }

Can you inherit a constructor java?

1028

Does sprintf allocate memory?

1053

What about method local inner classes or local inner classes in java?

1009

What is immutability in java?

1037

How do you write a good declaration?

916

What is an example of procedure?

968

Is namespace same as package in java?

941

How many types of memory areas are allocated by jvm?

986

Is ++ operator is thread safe in java?

903

What is generic class?

1050

What do you mean by constant time complexity?

1152

What is the difference between final, finally and finalize()?

1074

How is garbage collection controlled?

1124

Why do we use variables?

936

How do you download stubs from Remote place?

1727

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