Core Java Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

Core Java Interview Questions

Questions Answers Views Company eMail

Can a set contain duplicates?

1000

How does map works in java?

1050

Why array is used in java?

1018

Can we increase size of array?

1069

What is tostring () method?

1086

Is ++ operator is thread safe in java?

1003

Is linkedlist thread safe in java?

1034

Why map is used in java?

1084

Why arraylist is used in java?

1119

How to change value in arraylist java?

1244

How is hashcode calculated in java?

1086

Why do we need hashmap in java?

1174

How does queue work in java?

1025

Why constructor has no return type?

1131

Why for each loop is used?

1064

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Un-Answered Questions { Core Java }

What are the differences between this and super keyword?

983

How do you remove duplicates in java?

1071

Can a abstract class be defined without any abstract methods?

1055

Why string is not a wrapper class?

1226

How do you define a parameter?

1085

Give few examples of final classes defined in Java API?

1280

What is the difference between hashset and treeset in java?

1105

What is the difference between static and global variables and also define what are volatile variables?

1103

Which is better 64 bit or 32 bit?

982

What are accessor methods in java?

1053

Can a class have more than one object?

1048

What is javac in java?

1056

Where is const variable stored?

987

How we can make copy of a java object?

1145

What are "methods" and "fields"?

1065

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