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 use of marker interface? give me good example?

2 6179

what is use of threads how many ways to create thread

iTrust, Verizon,

3 10728

Program to print 1 1 2 1 2 3 1 2 3 4 like that

Huawei,

8 13549

program to find 25 square = 625 here the 625 of last two digits is equal to 25, i don't know excatly what this type of number is called

Huawei,

1 4287

i need to know the website that i can compile and run a java code in online.(while system doesn't contain any jdk and jre)

2063

What is JAVA? Why it is platform independent?

NIIT,

10 14517

i need to know the site which compiles and run the java program completely in online... thank you for your reply in advance

2 4077

what questions are been asked ??? for interview in apti

2142

Features of JAVA ? In which version of java synchronizedXXX() methods are included in Collections class.

NIIT,

1 6919

all are saying java doesn't support multiple inheritance but by default Object class is super class for all the user defined classes and we can extend atmost one class so each class can extend more than one class so java supports multiple inheritance?i am confused with this,pls any one explain me.

4 7592

CFG,

8 9350

what is class.forname() and how it will be useful ?

3 5893

how and when compiler knows that the Java code throws the checked Exception.

HSBC,

2 12725

diff. b/w JAVA and javascript...

NIIT,

3 6694

what is the difference between String s="hello"; and String s=new String("hello");?

3 13784

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Un-Answered Questions { Core Java }

What is the difference between abstraction and encapsulation?

1048

Difference between this() and super() in java ?

1078

Explain java thread life cycle.

1034

Who developed java?

990

Is null a string or object in java?

967

How is the marker interface used in Java?

1100

Is java owned by oracle?

1015

Explain wrapper classes in java?

993

How is tree Mirroring implemented?

1079

What do you know about the garbate collector?

1018

What is a methodologist?

1067

What is the return type of the main method?

1040

Can constructor be static or final?

1090

Is null false in java?

1193

Can variables be used in java without initialization?

1081

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