Core Java Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

Core Java Interview Questions

Questions Answers Views Company eMail

Why java is free from garbage values??

4 14509

what is singlton class?where it is use in real time senario.

Wipro,

1 5731

What are the override methods in Object class?

Tech Mahindra, Wipro,

2 5936

how to call one program .class file in another program

TCS,

7 10141

What is the difference(or similarity if there are some) between object and a variable?

ME,

4 6535

what are literals in java?

2 5129

When we r go to abstract class and when we go to Interface? i have confusion this question while in interview plz clarify

HCL, Photon,

3 6991

When should I use abstract classes and when should I use interfaces?

2 5598

What is basic concept of static in java ?

iGate,

1 6408

What is the difference between static synchronize() metod and synchronize() method?

Polaris,

1 3565

How can we get one Interface methods whit out using implementation of interface

Oracle,

1 3897

Why wait(),notify(),notifyAll() methods defined in Object class althought we are using in only threads.

Mphasis,

2774

can we write two same methods in outer class and innerclass.

3i Infotech,

1 3205

can we take more than one null values for Unique constraints.

3i Infotech,

1 4047

what is the main differene between synchronize() method and Synchronize{}block?

3i Infotech,

1 4183

Post New Core Java Questions

Un-Answered Questions { Core Java }

What do you mean by inner class in java?

1023

What is runtime polymorphism or dynamic method dispatch?

976

Can you extend main method in java?

1112

How do you compare two strings lexicographically?

894

Draw a UML class diagram for the code fragment given below: public class StringApplet extends Applet { private Label sampleString; private Button showTheString; private ButtonHandler bHandler; private FlowLayout layout; public StringApplet() { sampleString = new Label(" "); showTheString = new Button (" Show the String"); bHandler = new ButtonHandler(); layout = new FlowLayout(); showTheString.addActionListener(bHandler); setLayout(layout); add(sampleString); add(showTheString); } class ButtonHandler implements ActionListener { public void actionPerformed(ActionEvent e) { samplestring.setText("Good Morning"); } } } Note: The methods need not be indicated on the diagram.

1999

Garbage collection in java?

962

Why unicode is important?

900

What are the topics in core java?

1014

What is use of a abstract variable?

934

What is meant by attribute?

1043

What is the function of character?

1014

How list contains works in java?

934

Why is multiple inheritance not supported in java?

974

What does @param args mean in java?

1023

What is final modifier?

996

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