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 14690

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

Wipro,

1 5814

What are the override methods in Object class?

Tech Mahindra, Wipro,

2 6059

how to call one program .class file in another program

TCS,

7 10431

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

ME,

4 6698

what are literals in java?

2 5237

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 7120

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

2 5698

What is basic concept of static in java ?

iGate,

1 6486

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

Polaris,

1 3687

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

Oracle,

1 3969

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

Mphasis,

2821

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

3i Infotech,

1 3280

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

3i Infotech,

1 4141

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

3i Infotech,

1 4275

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Un-Answered Questions { Core Java }

What carriage return means?

965

Why singleton pattern is better than creating singleton class with static instance?

1000

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

1017

What is default size of arraylist in java?

1157

What is enhanced loop in java?

987

What are inbuilt functions?

994

What are the Class Libraries ?

1046

How to reverse a string in java?

1078

What means public static?

1038

Explain covariant method overriding in java.

1106

how many types of Inheritance?

1176

What is the difference between the direct buffer and non-direct buffer in java?

1032

How many bits is a string?

1005

What is mnemonic in assembly language?

1074

What is singleton class and how can we make a class singleton?

1100

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