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

Core Java Interview Questions

Questions Answers Views Company eMail

What is difference between add() and addelement() in vector?

1546

Describe how to implement singleton design pattern in struts.

1020

What is a treeset class?

1026

Can you explain the meaning of aggregation and composition

1028

What are the actions that can occur when a thread enters blocked state?

1073

What is garbage collector?

1100

Can we force the garbage collection to run?

973

why doesn't java run on all platforms?

1044

Can you tell me range of byte?

1010

Explain the use of javap tool.

1154

Difference between arraylist and vector.

1142

What is the difference between multiple processes and multiple threads?

1228

Explain the difference between abstraction and encapsulation.

994

What do you understand by synchronization?

1066

Define locale.

1047

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Un-Answered Questions { Core Java }

What is ordered map in java?

1030

How do you clear a list in java?

1143

What do you mean by local variable and instance variable?

966

Explain oops concepts in detail?

1040

What is local variable and instance variable?

1067

How to check if linked list contains loop in java?

915

What is a nullable field?

1054

Can a class have 2 constructors?

916

What are the escape sequences in java?

1041

What does the append?

1015

Difference between operator overloading and function overloading

1086

What is string :: npos?

1106

Explain inheritance in java?

1009

What does n mean?

1011

What is the difference between jdk, jre, and jvm?

1134

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