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

Core Java Interview Questions

Questions Answers Views Company eMail

How will you reverse a singly-link list?

Akamai Technologies,

954

Is linked list a linear or non-linear data structure?

Akamai Technologies,

930

What are the Main functions of Java?

Akamai Technologies,

1061

State the merge-sort principle and its time complexity.

Akamai Technologies,

932

What are access specifiers in java ?

Akamai Technologies,

1070

What data structures are used to perform recursion?

Akamai Technologies,

1004

What is a stack class in java ?

Akamai Technologies,

1061

What is method overloading in JAVA? Why is it not present in C ?

Akamai Technologies,

1052

What is the difference between quicksort & mergesort? When should they be used? What is their running time?

Akamai Technologies,

1039

Lowest Common ancestor in a Binary Search Tree and Binary Tree.

Amazon,

898

Program to Find the second largest element in an array.

Amazon,

1125

Print Vertical traversal of a Binary Tree.

Amazon,

985

Make a data structure and implement an algorithm to print all the files in a directory. (The root directory can have sub-directories too.)

Amazon,

1292

Is {a, n, d} a palindrome? If you are given a random string, is it a palindrome or not?

Amazon,

1066

Add a value x to array from index l to r where 0 <= l <= r <= n-1

Amazon,

1033

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Un-Answered Questions { Core Java }

What are recursive functions?

993

Explain about narrowing conversion in java?

970

What are the 3 types of control structures?

968

What exactly is methodology?

867

When would you use a static class?

929

What are the pillars of java?

875

What are the advantages of java over C++?

1154

What is the function of http?

979

Differentiate between the constructors and methods in java?

907

What is polymorphism and what are the types of it?

948

How many bytes is a string java?

975

What is a consumer in java?

974

How to make object serializable in java?

932

Explain about doubly linked list

983

What is the abstraction?

976

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