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 8460

What is meant by wrapper classes?

3 9239

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

2 27541

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

Wipro,

7 11683

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 3898

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

1 3928

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

4 6490

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

2 4977

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).

2045

Is there memory leaks in java?

3 6001

Need to use public,static keywords in main function?

5 7437

How core java/j2ee project performance can be measured ?

1 3924

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 7772

How Marker Interfaces are instruct to complete the desired need ?

2 4323

Matrix multiplication only using OOP concepts .

3984

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Un-Answered Questions { Core Java }

What is cr keyboard?

1344

How many characters is 2 bytes?

1040

how we can make a read-only class in java?

1040

What environment variables are required to be set on a machine in order to run Java programs?

1276

What are serialization and deserialization?

1316

What is a newline character in java?

1088

How dead lock situation occurs in java and how you can identify it?

1045

What are voids?

1019

Can we call the constructor of a class more than once for an object?

1140

What is advantage of java?

1070

Can there be an abstract method without an abstract class?

1012

How would overload a function based on return type?

1038

What is java util list?

1035

What is the meaning of flag day?

1082

Explain covariant method overriding in java.

1167

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