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

Core Java Interview Questions

Questions Answers Views Company eMail

whats the life cycle of jsp

Satyam,

2 5903

what is mean by method signature?

Satyam,

8 12844

what is mean by String and StringBuffer? What is mean by Methooverriding and Overloading?

Satyam, STI,

3 8725

whats the life cycle of jsp

Satyam,

15 23247

wht is customised exception?

Logica CMG, Novell, Prudential,

1 6664

what is diff bet iterator and enumeration?

4 9455

whats is the use of final,in which situation final can be used in the application?

DNS,

2 5591

Explain class A{} class B{} class C{} all the three classes are saved in a single file name, what the name should i provide to the file ,in what file name should i run the program? Ple Explain

DNS, Infosys, TCS,

9 13547

what is overloading in java?

Ascent, DNS, Infosys, SDA, VelTech,

13 34215

They had given one progam final HashMap hm=new HashMap(); public void show() { hm.put("name",value); } in this prg here the final hashtable value can be changed in put method,its the prg run?

DNS, Wipro,

3 13670

they asked class A{} class B{} class c{} all the three class saved as a single file,there is no main method in the file and anothe class M.java class m { psvm(String args[]) { // here the parent class can access } }

DNS, IPSR Solutions,

2 6366

how you will prevent inheritance is there any other way other than inheritance?

Wipro,

4 9354

how you will prevent method overriding?

HCL,

6 14534

byte a=5; byte b=5; byte c=a+b; System.out.println(c); whats the o/p?

NIIT, Wipro,

7 23827

whats is inheritance?

CTS, HCL,

15 19335

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Un-Answered Questions { Core Java }

What does @override mean?

1135

Can vector have duplicates in java?

903

What is the main function in java?

1023

What is map in java?

959

What is the common usage of serialization? What exceptions occur during serialization?

1071

How does singleton class work?

950

What is the access scope of protected access specifier?

952

What is difference between classpath and path variables in java?

1157

What is numeric function?

973

What is the primary benefit of encapsulation?

1036

Can we have multiple public classes in a java source file?

1125

How do you escape json?

951

Is null an object in java?

990

What is string length in java?

907

What is difference between synchronize and concurrent collection in java?

1007

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