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 22860

In Serialization, whether you will use Static variables?

HCL,

3 10017

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

4 8467

Is java supports multiple inheritance? explain?

BUET, Inforica,

12 21202

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

1 5419

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 9387

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 32113

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

CTS, Honeywell, McAfee,

13 30912

what is difference between abstraction and interface?

FIC,

8 13657

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

11 35613

Describe inheritance as applied to java?

4 11868

what is a package?

11 16150

what is a thread?

IBM, SunGard,

13 22593

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 8461

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 21054

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Un-Answered Questions { Core Java }

What are basic keywords?

1088

How can a gui component handle its own events in java programming?

1094

Why is string class considered immutable?

1118

What are variable names?

1029

What about main() method in java ?

1065

What was java originally called?

1009

What does java se mean?

1104

What is the lifetime and scope of a variable?

1068

Why java applets are more useful for intranets as compared to internet?

1143

What is command line argument in java?

1237

How does the java compiler work?

1046

How much is a java license?

991

Explain about fail safe iterators in java?

1086

Where are global variables stored?

1021

How is garbage collection controlled?

1234

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