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 do I get a substring?

931

What is basic syntax?

979

Is integer a class?

1018

Why is string builder not thread safe?

1015

What is the instance of an object?

1118

Is string a wrapper class?

967

What is the generic function?

928

Is string an object?

1064

How do you replace all in word?

991

How do you know if a value is nan?

1012

Does printwriter create a file?

912

How do you use wildcards?

984

What is difference between string and stringbuffer?

999

What are the special characters?

927

What does it mean that strings are immutable?

1075

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Un-Answered Questions { Core Java }

What is codebase?

945

Is boolean a wrapper class in java?

1002

What is the difference between final, finally and finalize()?

1065

What is nextint java?

977

Explain the difference between extends thread vs implements runnable in java?

1061

What is the purpose of a default constructor?

1038

What is the protected method modifier?

990

What is sortedmap in java?

977

Explain the difference between an object-oriented programming language and object-based programming language?

931

what are three ways in which a thread can enter the waiting state? : Java thread

952

How do you join strings in java?

983

Is logger a singleton?

896

List some important features of java 10 release?

982

What is difference between jdk,jre and jvm?

1048

Why we go for collections in java?

925

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