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,

1011

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

Akamai Technologies,

975

What are the Main functions of Java?

Akamai Technologies,

1097

State the merge-sort principle and its time complexity.

Akamai Technologies,

982

What are access specifiers in java ?

Akamai Technologies,

1148

What data structures are used to perform recursion?

Akamai Technologies,

1060

What is a stack class in java ?

Akamai Technologies,

1110

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

Akamai Technologies,

1107

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

Akamai Technologies,

1089

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

Amazon,

934

Program to Find the second largest element in an array.

Amazon,

1199

Print Vertical traversal of a Binary Tree.

Amazon,

1019

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,

1345

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

Amazon,

1135

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

Amazon,

1095

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Un-Answered Questions { Core Java }

What are the six ways to use this keyword?

1061

What is the use of arraylist class in java?

1087

Is age a discrete variable?

984

List the features of java programming language.

1063

What are basic data types?

1104

What does += mean in java?

1098

What is a singleton factory?

961

Why is method overloading not possible by changing the return type in java?

1011

Why arraylist is not synchronized in java example?

1075

Can we have a method name same as class name in java?

1061

what is function overloading in java?

1309

What is a nested structure?

1050

What is the purpose of methodology?

1083

Can a class be private in java?

1002

What is a platform?

1086

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