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 convert string to byte array and vice versa?

1161

What is string subsequence method?

1184

How can we make sure main() is the last thread to finish in java program?

1264

how to split string in java?

1296

What does string intern() method do?

1137

Difference between string, stringbuffer and stringbuilder?

1083

What is volatile keyword in java

1189

Explain differences between collection api and stream api?

1259

What are the three parts of a lambda expression? What is the type of lambda expression?

1091

Does string is thread-safe in java?

1157

What is java thread dump, how can we get java thread dump of a program?

1078

How to convert string to char and vice versa?

1056

Write a method to check if input string is palindrome?

1076

How can we make string upper case or lower case?

1146

How to compare two strings in java program?

1116

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Un-Answered Questions { Core Java }

Is java a utf 8 string?

1028

Write a factorial program using recursion in java?

1099

How to display all the prime numbers between 1 and n (n is the number, get the input from user)

1035

Explain inheritance in java?

1071

What does n mean in java?

1036

What is meant by main method?

1127

What is the default value of an object reference declared as an instance variable?

1189

Explain the concept of hashtables?

1235

What modifiers are allowed for methods in an interface?

1229

Define how objects are stored in java?

1131

What is the difference between call by reference and call by pointer?

1030

How do you sort a set in java?

978

What is the difference between overriding & overloading?

1152

How can you generate random numbers in java?

1107

What will happen when using pass by reference in java?

1049

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