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 22553

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 20858

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

1 5327

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 9222

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 31520

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

CTS, Honeywell, McAfee,

13 30386

what is difference between abstraction and interface?

FIC,

8 13360

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

11 35122

Describe inheritance as applied to java?

4 11657

what is a package?

11 15737

what is a thread?

IBM, SunGard,

13 22062

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 20787

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Un-Answered Questions { Core Java }

What is a nested structure?

1041

What is mvc in java?

1013

What is default exception handling in java?

1031

Explain the difference between an object-oriented programming language and object-based programming language?

983

What are loops in java? What are three types of loops?

1033

What does serializing data mean?

941

What is a predicate method?

1017

What is the difference between super class & sub class?

1193

Explain importance of inheritance in java?

1025

What is a method in coding?

1055

what is mutual exclusion? : Java thread

1021

What is the transient keyword?

2176

How do you calculate square roots?

1166

What is thread life cycle?

967

Why constructor has no return type?

1099

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