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Core Java Interview Questions
Questions Answers Views Company eMail

How will you reverse a singly-link list?

Akamai Technologies,

1053

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

Akamai Technologies,

1013

What are the Main functions of Java?

Akamai Technologies,

1137

State the merge-sort principle and its time complexity.

Akamai Technologies,

1038

What are access specifiers in java ?

Akamai Technologies,

1205

What data structures are used to perform recursion?

Akamai Technologies,

1106

What is a stack class in java ?

Akamai Technologies,

1158

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

Akamai Technologies,

1153

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

Akamai Technologies,

1145

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

Amazon,

988

Program to Find the second largest element in an array.

Amazon,

1264

Print Vertical traversal of a Binary Tree.

Amazon,

1067

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,

1381

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

Amazon,

1200

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

Amazon,

1138

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Un-Answered Questions { Core Java }

take an array with -ve and +ve value both.find out the nearest value of 0(zero).if two values are same like(-2 and +2)then extract +2 is nearest of 0(zero).

2047

Explain how can you debug the Java code?

1121

Explain numeric promotion?

1166

What is string made of?

1021

Is the empty set a singleton?

1039

What is the escape character in java?

1039

give an example for encapsulation?

1095

Implement two stacks using a single array.

1110

What is indexof in java?

1058

Explain the significance of class loaders in bootstrap?

1021

What is boolean example?

1024

How many types of gc are there in java?

1048

What are the 2 types of java programs?

1160

Can you run java program without main method?

1117

Why is singleton not thread safe?

1112

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