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

Core Java Interview Questions

Questions Answers Views Company eMail

Why java is free from garbage values??

4 14679

what is singlton class?where it is use in real time senario.

Wipro,

1 5801

What are the override methods in Object class?

Tech Mahindra, Wipro,

2 6048

how to call one program .class file in another program

TCS,

7 10400

What is the difference(or similarity if there are some) between object and a variable?

ME,

4 6678

what are literals in java?

2 5223

When we r go to abstract class and when we go to Interface? i have confusion this question while in interview plz clarify

HCL, Photon,

3 7109

When should I use abstract classes and when should I use interfaces?

2 5680

What is basic concept of static in java ?

iGate,

1 6477

What is the difference between static synchronize() metod and synchronize() method?

Polaris,

1 3674

How can we get one Interface methods whit out using implementation of interface

Oracle,

1 3960

Why wait(),notify(),notifyAll() methods defined in Object class althought we are using in only threads.

Mphasis,

2820

can we write two same methods in outer class and innerclass.

3i Infotech,

1 3272

can we take more than one null values for Unique constraints.

3i Infotech,

1 4130

what is the main differene between synchronize() method and Synchronize{}block?

3i Infotech,

1 4260

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Un-Answered Questions { Core Java }

What are java packages? What is the significance of packages?

1006

What is the simpletimezone class in java programming?

1126

What is a byte string?

1093

Tell me the Importent classes in net package?

1993

Write a program to search a number in the given list of numbers.

1027

What are the major drawbacks of external iteration?

1057

What is method in java with example?

946

Write a program to print count of empty strings in java 8?

999

Why does the integer quotient -0/3 yield 0, but the double quotient -0.0/3.0 yields – 0.0?

1042

What is string args [] in java?

1031

What exactly is a .class file?

1042

Explain jdk, jre and jvm?

967

If two threads have same priority which thread will be executed first ?

1471

When throws keyword is used?

994

What do you mean by scope of variable?

886

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