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

Core Java Interview Questions

Questions Answers Views Company eMail

Implement two stacks using a single array.

Global Logic,

1111

What is the use of 'super' keyword inside a constructor?

Flextronics, Thomson Reuters, Virtusa,

1027

What is the method to declare member of a class static?

HCL,

1063

What is Mutex (Mutual Exclusion Object) ?

Ciena,

1221

Give differences between Quicksort &Mergesort. When should these sorts be used andwhat is their running time in java?

Genpact,

1293

What do you mean by JVM?

Ericsson,

1143

When does a class need a virtual destructor?

Flextronics,

1070

How is tree Mirroring implemented?

Fidelity,

1125

How can u increase the heap size in the memory?

Infosys,

1072

What do you understand by abstract classes?

HCL,

1140

How do you implement tree mirroring in java?

EXL, HCL,

1128

Explain the key functions of data binding?

Akamai Technologies, Aspire, Impetus, Infogain, Tavant Technologies, Virtusa,

1073

What is Major and importance difference between for and foreach loop ?

Infosys,

1212

What is the use of generics? When was it added to the Java development Kit?

Impetus,

1072

Explain the difference between a Thread and a Process.

Ciena,

1050

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Un-Answered Questions { Core Java }

What is the default value of byte datatype in java?

979

What is queue in java?

1226

Explain the difference between throw and throws in java?

1068

What is a locale?

1223

What are the wrapped, classes?

1111

What are user defined exceptions?

1096

Is oracle charging for java?

1089

What are advantages and disadvantages of OOPs?

1198

Can you call one constructor from another if a class has multiple constructors?

1105

What are autoboxing and unboxing? When does it occur?

1020

What is void keyword?

1162

Why main method is static in java?

1239

What will happen when using pass by reference in java?

1045

What is the static method?

1134

What is the benefit of lambda expressions?

1141

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