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 to count occurrences of each duplicate element in a list {a,b,d,c,a,b} ? Thanks in Advance

TCS,

2 8353

What is meant by wrapper classes?

3 9090

how to get the max salary and name of employee from arraylist without using the Comperator or even Comparable interface?

2 27447

how can i take the inputs from users in java program?

Wipro,

7 11428

HOW TO PRINT A NO IN WORDS USING WHILE LOOP THE NO WILL BE PRINTED WHEN IT WILL BE IN THE RANGE BETWEEN 1 AND 3?

1 3815

hoe can u call a constructor of a private classs to other inherited claa??

1 3849

how can be object class inherited to all class in a program when java does not support multiple inheritance??

4 6351

can two class in a code be public??if yes then how??

2 4887

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).

1980

Is there memory leaks in java?

3 5892

Need to use public,static keywords in main function?

5 7256

How core java/j2ee project performance can be measured ?

1 3843

If there are two notepad opened and working on it . is this a process or thread? computer based Live Example to differentiate between Thread , Process , and Multi tasking ?

TCS, Wipro,

3 7621

How Marker Interfaces are instruct to complete the desired need ?

2 4221

Matrix multiplication only using OOP concepts .

3928

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Un-Answered Questions { Core Java }

What is difference between checked and unchecked exception in java?

1020

What do you mean by platform independence?

1053

What is the difference between error and an exception?

1155

What do you mean by scope of variable?

892

Write a method to check if input string is palindrome?

1019

How does varargs work in java?

1094

what is heap memory?

1100

What is thread safe singleton?

946

Why pointers are not used in java?

1129

Can we override tostring method in java?

970

What is java dot?

951

What is :: operator in java 8?

1021

What is the lifetime and scope of a variable?

1017

what is the difference between thread and runnable types? : Java thread

1005

How do I compare two strings in word in java?

991

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