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 14701

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 10437

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

ME,

4 6700

what are literals in java?

2 5241

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 7121

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

2 5698

What is basic concept of static in java ?

iGate,

1 6493

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

Polaris,

1 3688

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

Oracle,

1 3971

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

Mphasis,

2823

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

3i Infotech,

1 3284

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

3i Infotech,

1 4143

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

3i Infotech,

1 4275

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Un-Answered Questions { Core Java }

Is array dynamic in java?

939

Differentiate between the constructors and methods in java?

952

Who developed java?

999

What is variable and its types?

1028

What is the difference between method overriding and overloading?

1234

What type of variable is error flag?

1071

What is generic class?

1097

Why put method is idempotent?

919

Can we execute java program without main method?

1112

What is lexicographically smallest string?

1068

Write a function for palindrome and factorial and explain?

1079

How do you compare objects in java?

961

what do you understand by the term string with respect to java?

1041

What is double data type?

950

How do you check whether the list is empty or not in java?

980

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