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,

1009

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

Akamai Technologies,

971

What are the Main functions of Java?

Akamai Technologies,

1092

State the merge-sort principle and its time complexity.

Akamai Technologies,

979

What are access specifiers in java ?

Akamai Technologies,

1143

What data structures are used to perform recursion?

Akamai Technologies,

1054

What is a stack class in java ?

Akamai Technologies,

1107

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

Akamai Technologies,

1103

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,

932

Program to Find the second largest element in an array.

Amazon,

1190

Print Vertical traversal of a Binary Tree.

Amazon,

1017

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,

1336

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

Amazon,

1134

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 }

How to print nodes of a Binary tree?

2251

What is meant by memory leak?

1075

What is a treeset class?

1008

Can we have multiple classes in single file ?

1070

How do you add an arraylist to an array in java?

982

How do you use substring in java?

1141

What is immutable state?

1028

What are the differences between path and classpath variables?

1042

What is an object class?

1027

Why main() method is public, static and void in java ?

1101

What is void class in java?

977

What is difference between throw and throws ?

1139

Explain about sets?

1026

How many bytes is a unicode character?

1007

What is the difference between the jdk 1.02 event model and the event-delegation model introduced with jdk 1.1?

1136

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