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

Core Java Interview Questions

Questions Answers Views Company eMail

What is the major drawback of internal iteration over external iteration?

1040

Why string is immutable or final in java

1100

What is internal iteration in java se 8?

1215

What is thread pool? How can we create thread pool in java?

1089

Why string is popular hashmap key in java?

1 2507

how to create daemon thread in java?

1091

Write a program to print all permutations of string?

1126

Why char array is preferred over string for storing password?

1123

Can we use string in switch case in java?

1074

How can we achieve thread safety in java?

1167

What is string in java? String is a data type?

1030

What is string pool?

1141

When do we need to use internal iteration? When do we need to use external iteration?

1142

How can we create a thread in java?

1052

Differences between external iteration and internal iteration?

1178

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Un-Answered Questions { Core Java }

How does linkedlist work in java?

954

What is the indent key?

1050

I want to re-reach and use an object once it has been garbage collected. Define how it’s possible?

1028

Can a method be overloaded based on different return type but same argument type?

983

Why do people says “java is robust”?

1048

What things should be kept in mind while creating your own exceptions in java?

1179

Difference between object and reference?

1187

How to sort double array in java?

1003

Explain the difference between call by refrence and call by value?

1042

What is the base class of all classes?

1071

What is variable and constant explain with example?

1107

Why is boolean important?

1078

What is api data?

1018

What is regex in java?

961

What is considered an anti pattern?

948

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