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Immutable Strings Object
How String object is immutable and why?
ramnath_19
- Jan 3rd, 2008
Ur question can be answered with an example : String s = "here it goes";s.toUppercase(); This does not modify the variable s at all. Instead, a new String object is created with all the cha...
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What is the difference between exit(o) and exit(1) in Java?
ravi_1229
- Mar 24th, 2008
The number is only the status code for the termination of the JVM. It does not effect the actual command. By convention 0 means a normal exit, any other number is an abnormal termination.
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What is the difference between JDK1.4 and JDK1.5
prawintowin
- Mar 26th, 2008
In JDK 1.5 there are many new IO classes, enhanced for loop, autoboxing (i.e., we can directly use the Wrapper classes are primitive data types.) For example,Integer a = 10; where as in JDK 1.4 it is not possible. These are the main differences.Hope I have answered your question.
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JIT Compiler and Interpretor in JVM
In Java JVM we have both JIT compiler and interpretor What are the functionalities of both?
Aravinda Rao
- Mar 31st, 2008
Both JIT compiler and Interpretor are used to convert Virtual Machine(VM) instructins into native machine code and VM use this code for Execution.Running the JIT compiled code is...
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Make .exe file
How to make .exe file in Java for desktop application?
AmitPai
- Apr 19th, 2008
Java is a secure programming language!!Its nearly impossible to make .exe files!!
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Memory Allocation
How can you ensure that the memory allocated by an object is freed?
haribcse
- Mar 23rd, 2009
Garbage collection in Java cannot be forced. JVM will decide when to free memory
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Scenarios to Test Sessions
What could be possible scenarios to test sessions in any J2EE based application?
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Class and Instance Variable
What is the difference between a class variable and an instance variable?
ravi_1229
- Mar 24th, 2008
Instance variables created? per copy. for ex: class A{??? private String instVariable="Hello";??? public static void main(String a[]){??? ?? A obj1=new A();??? ?? A obj2=new A();??...
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Equals() and hashCode()
Why should we implement equals() and hashCode() while using hastable?
inder_gwl
- Sep 24th, 2009
You must override hashCode in every class that overrides equals(). Equal objects must have equal hash codes. In other words, If two objects are equal according to the equals (Object)method, then calli...
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Expression and Boolean Expression
Explain the difference between an expression and boolean expression
mkannanmca86
- Apr 29th, 2008
Every expression have some value after the evavulation. If the resultant value is neither TRUE nor FALSE then it is known as a boolean expression, else if come any other values then it is k...
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Print Command Line Arguments
How to print Command Line Arguments without using IO Classes?
aswinikalapeeti
- Jun 20th, 2008
you can print command line arguments, by giving what to print while executing java program.the code for this isclass Demo{ ...
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Phantom memory
What is phantom memory and how it is useful?
rajamuthuramans
- May 27th, 2008
A phantom reference lets you do final touch up closing on an object, even after it has been declared dead no longer referenced by any live object.Java has four orders of strength in holding onto O...
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HTTP Status 500
Followign down error i get when i try to login to my page.here my front login page is open and then when i try to login that time this error i reciving.here my server is AIX server and TOMCAT webserver and DB2 database i m using.Few month before this portal was working and now giving this error.please give me any solution if u have.====================================HTTP Status 500 - --------------------------------------------------------------------------------type...
srinivasan_81
- Aug 4th, 2008
Please let us know what action are you trying to perform after login? Are you getting this error while login? Have you stored login members list and trying to retrieve them from DB and while retrieving are you getting this error? if so check up your JDBC connections and the resultset.
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Interface and Inheritance
Explain why we go for interface instead of multiple inheritnace?
giridhar49
- Oct 11th, 2008
Suppose we have 3 classes A,B,C. Here C is derived from classes A and B. HERE A and B classes have same method suppose print(). As we know we can call base class methods by creating objects of derived...
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Choose between abs class with abs method and interface with abs method
If i have a class that can extend abs class n implement interface...and it doesn't have to achieve inheritance ,doesn't have to extend any other class then which 1 should i use between extending a abs class with abs method or implementing interface with abs method.?/pls ans
kandulas
- Mar 27th, 2009
interface cde { void abc();}class abc implements cde { public void abc() {System.out.println("hai"); }}class greek&n...
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Java iText
I would like to create a PDF file using java and iText , getting data from the database.I am looking for examples.
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Package Program
How to create a package program and what is the step to use a package program and how to run this type of programs?
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Adding Two Numbers
How to add two numbers without using arithmetic operators?
antony75
- Aug 4th, 2008
int firstnumber = 1int secondno =2for(int count =0;count<secondno;count++){ firstnumber++;System.out.println(firstnumber);}
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Change jar File Icon
How to change jar file icon.
Sandhya.Kishan
- Aug 1st, 2012
The jar file doesnt have an icon, its a system-wide setting that applies to ALL jar files.
Java Interview Questions
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