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 14854

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

Wipro,

1 5879

What are the override methods in Object class?

Tech Mahindra, Wipro,

2 6150

how to call one program .class file in another program

TCS,

7 10644

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

ME,

4 6825

what are literals in java?

2 5346

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 7233

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

2 5795

What is basic concept of static in java ?

iGate,

1 6567

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

Polaris,

1 3763

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

Oracle,

1 4048

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

Mphasis,

2890

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

3i Infotech,

1 3364

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

3i Infotech,

1 4213

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

3i Infotech,

1 4337

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Un-Answered Questions { Core Java }

What is void keyword?

1159

What is data movement?

1200

What are dot operator queries?

1153

What is singleton math?

1217

Difference between Preemptive scheduling vs. Time slicing?

1055

What is the role of the java.rmi.naming class?

1143

What is identifier with example?

1096

What do you mean by scope of variable?

939

What are variable names?

1019

How do you remove duplicates from an array in java?

1012

What are assembly attributes?

1062

How to perform bubble sort in java?

1051

Explain how to force the garbage collection in java.

1023

Which method must be implemented by all threads?

1318

Name few java util classes introduced with java 8 ?

964

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