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

Core Java Interview Questions

Questions Answers Views Company eMail

Which is the best way to use for String concatenation in Java?

HCL,

7 22614

In Serialization, whether you will use Static variables?

HCL,

3 9908

How do you relate a Interface to a Class? Tell me in Detail?

4 8294

Is java supports multiple inheritance? explain?

BUET, Inforica,

12 20942

which swing component is similar to rich text box in .net/vb

1 5352

Which One is optimal to choose ? Syncronized hash map or Hash table with single thread model? How can a hash map syncronized with out using syncrozed blocks in programm?

Four soft,

3 9257

int a=10,b=20,c=30 a= b+c;b=a+c;c=a+b; System.out.println("The value is"+a+b+c;

Honeywell,

17 31632

int a=1; float b=1.0; System.out.println(a==b);

CTS, Honeywell, McAfee,

13 30488

what is difference between abstraction and interface?

FIC,

8 13427

waht happens when a return type ,even void is specified for a constructor?

11 35177

Describe inheritance as applied to java?

4 11696

what is a package?

11 15813

what is a thread?

IBM, SunGard,

13 22159

class{ ... ... interface myinterface{ ... ... } abstract class{ .. .. } ... .. .. } is this possible to write "Interface and/ or Abstract class inside a class ? if possible whcich one is possible is only interface? is only abstract?

Logica CMG,

2 8353

class A{ m2(){ } } class B extends A{ m2(){ } } class c extends B{ m2(){ } } class my_class extends c{ m2(){ } pulic static void main(){ ...My_class a = new my_class(); super.super.super.m2(); is this is leagal if not find what is the legal procedure in order to call A's version of m2(); }

Logica CMG,

8 20838

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Un-Answered Questions { Core Java }

What is pass by value?

958

Is assembly language a low level language?

973

What does opcode mean?

1099

What is += mean in java?

1010

What is vector?

1079

How to create com object in Java?

1086

Explain reverse a linked list recursive java solution?

997

Is a copy constructor?

1069

Which is better list or arraylist in java?

878

What is hasnext in java?

1028

What is the Scope of Static Variable?

1246

What is wrapper class example?

1011

What are synchronized methods and synchronized statements in java programming?

1033

There are two classes named classa and classb. Both classes are in the same package. Can a private member of classa can be accessed by an object of classb?

1501

What is string pool in java?

1036

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