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 26536

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 24164

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 8423

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

5 11759

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

Infosys, Synechron,

8 15219

why marker interfaces are there in java

Digital Group,

4 9698

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 26005

Can we declare static variables in JSP page.

TCS,

3 24233

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

IBM,

12 19836

write java code to print second max number in the array

Huawei, IBAB,

12 24482

how to call One constructor from another;

Innodata Isogen,

10 18094

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 9945

Post New Core Java Questions

Un-Answered Questions { Core Java }

What is an image buffer?

1037

Who is founder of java?

1046

Are generics important java?

1044

How many types of gc are there in java?

1050

Can we override protected method in java?

1116

What is jagged array in java?

1163

Is string a class in java?

1037

What is local variable and instance variable?

1106

What is the difference between member variables initialization and assignment in a constructor?

1343

Does string is thread-safe in java?

1148

Explain about instanceof operator in java?

1123

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

1145

What is the epoch date?

1072

What is a control variable example?

1082

What is the console in java?

1213

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