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 you check if a string contains only numeric digits?

1140

Is it possible to cast an int value into a byte variable? What would happen if the value of int is larger than byte?

970

Differentiate between a constructor and a method? Can we mark constructors final?

1209

What is the difference between heap and stack memory?

1212

What do you understand by java?

1007

Explain 5 io best practices?

1054

What are the differences between throw and throws?

1084

What is the difference between jvm and jre? What is an interface?

1113

What is the numeric promotion?

1048

What is the multi-catch block in java?

1062

What are constants?

1067

Is java platform independent?

993

Can we have multiple classes in a single file?

1000

What is the exception hierarchy in java?

984

What is constructor chaining in java?

1081

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Un-Answered Questions { Core Java }

What do negative exponents mean?

1065

Why does java not support pointers?

1128

What is the difference between @before and @beforeclass annotation?

1131

Explain the difference between a Thread and a Process.

1019

How do you use parseint in java?

995

Is java a software?

965

What is preparedstatement in java?

1069

Which software is used for java programming?

1042

What is append function?

1019

Explain the difference between throw and throws in java?

1022

What is the advantage of functional interface in java 8?

1009

What does || mean in code?

1057

What is substring 1 in java?

1177

Can we make constructors static?

1254

Define inheritance?

1030

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