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 22554

In Serialization, whether you will use Static variables?

HCL,

3 9882

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

4 8253

Is java supports multiple inheritance? explain?

BUET, Inforica,

12 20860

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

1 5328

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 9223

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 31524

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

CTS, Honeywell, McAfee,

13 30389

what is difference between abstraction and interface?

FIC,

8 13361

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

11 35124

Describe inheritance as applied to java?

4 11658

what is a package?

11 15741

what is a thread?

IBM, SunGard,

13 22065

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 8339

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 20788

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Un-Answered Questions { Core Java }

Explain about doubly linked list

1032

How do you avoid global variables?

1088

What is fail fast in java?

1164

What’s the difference between applets and standalone program?

1047

How do you find the absolute value?

1060

Describe method overriding

1126

Can a static class implement an interface?

1124

How variables are stored in memory?

1000

What is size_t?

983

What are new features introduced with java 8 ?

993

What is keyword in oop?

953

Explain the differences between abstraction and encapsulation?

1055

Give a brief description of java socket programming?

964

What are the differences between path and classpath variables?

1042

Explain the access modifiers for a class, method and variables?

1142

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