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Why constructors don't have return type?
nandha gopal
- Apr 13th, 2006
The constructor is getting called when ever the object for the class is created.In java or c++ the object is created like as followsclass A{//some code}//class endsin java A obj = ne...
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Creating database tables during the application run time
hi,I'm doing a project using jsp, java script, HTML as front end and sql server as backend.i want to create my database inn runtime. while doing so ,1. how do i check for an already existing class2. if there is an already existing class then i need to update the table .how do i do this. can any one guide through this.vidhya
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}">What is the meaning of final keyword in java? I know that it is used to declare constant values which are not modifiable. But in the below program even I declare the vector as final, then still I am able to modify it? Can any body explain what is the scenario here?import java.util.*;public class A{ public static void main(String args[]) { final Vector v=new Vector(); v.addElement("element1"): }}
badkasys
- May 2nd, 2006
wot my perception is when u declare this object reference as finalthis means that u can not change this reference, i mean u can not makethis final variable to point to another Vector object.e.g in sa...
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What is Mutable and Immutable Objects?
sivanesh.a
- Dec 4th, 2006
Mutable Objects; - > values can be modified.Immutable Objects:-> Values cannot be modified.
sarrajuvarma
- May 29th, 2006
The objects whose contents can be modified are called as MUTABLE objects.Ex : StringBufffer class objects.The objects whose contents cannot be modified are called as IMMUTABLE objects.Ex : String clas...
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What is meant by Tomcat in java and its usage?
Kamal
- Aug 26th, 2006
Tomcat is Webserver.As one requires to execute there websites on some of the server.Tomcat is solution .We can execute .jsp files on this server
sadashivarao
- Jun 18th, 2006
Tomcat is a webserver, which supports only http protol, we can use tomcat to deploy webapplications in it.
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What is real life use of singletone class in java
rgoel79
- May 25th, 2006
Singleton ensures that you have only one object of a particular class per JVM. It is used when you need to refer to same object in say different instances of other classes. e.g. in a servlet, each tim...
Kavitha
- May 22nd, 2006
The best use is, In most of the pooling(Connection Pool) we use singleton to access the connection
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Does import make my class bigger? Does it actually compile the imported class or package into my code?
hmashruf
- Oct 5th, 2006
HiOnce a class is declared in import statment, during compilation of the class which imported, the compiler checks whether imported class is compiled if not then ClassNotFoundException is th...
Jitender
- Jun 22nd, 2006
There is no runtime cost from using an import statement The compilation process can take a little more time with an import statement The compilation process can take even more time with a wildcard imp...
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Can you make a method final, without making the whole class final?
Seetha Ram Janapala
- May 22nd, 2006
Definitely we can make a method final, without making the whole class as final.ex:public class MyClass{ private String name = "Ram"; public String getName() &n...
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Wat is dynamic binding?
ajaykjha
- Oct 16th, 2006
Generally, java resolves calls to methods at run time. This is called late binding or dynamic binding. This occurs in the case of overriding. Sometimes a call to one can be resolved at compile time. ...
Sangram
- Jul 13th, 2006
Dynamic binding is feature in which method calls are processed at runtime.Type recognition of object is also comes under dynamic binding.But after all it is binding of variables and methods at runtime.
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What are adapter classes?
sivanesh.a
- Dec 24th, 2006
Implementing all the methods is not necessary if the class is declared as Adapter class.
Manivannan Palanichamy
- Aug 2nd, 2006
In general, an adapter class is a pattern, thats an abstract. It provides empty implmentation for its method, optionally you can implement some of them.
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Can some one pls tell me the exact difference between mutable and immutable ?
manoj
- Aug 21st, 2006
Scripting languages often follow the syntax and semantics of command languages. For instance, many scripting languages do not require quoting of string literals, but rather require explicit evaluation of variables (x denotes the string "x", but $x denotes the value of the variable x).
luckshme
- Jul 31st, 2006
A class is said to be designed for Mutable objects if the class provides public attributes that can be directly changed or public methods that can change the values of private attributes thereby chang...
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1.what is a lock in core java?
ajaykjha
- Oct 15th, 2006
The lock is acieved in java by using monitor which is implecitely available to all objects. Once a thread enters into monitor no other thread can enter into the monitor on the same object.
debabrat panda
- Sep 26th, 2006
hi sheetallock concept in not a class level it is object levelClass locks are actually implemented as object locks. When the JVM loads a class file, it creates an instance of class java.lang.Class. When you lock a class, you are actually locking that class's Class object.deb
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Take 2 classes.i.e., Class A,Class B.In Class B declare constructor as Private.But I have to access Class A using the constructor in Class B.How is it possible?One interviewer told that Through getInstance() method it's possible to access Class A.eEven Class B declare as Private.How is it possible?Explain with an example.
byteTech
- Jan 9th, 2007
The whole point of making the constructor of Class B private is to prevent its instantiation by the general audience. This is the genesis of factory design pattern, Class B in this case will define a getInstance() method which will return objects of class A
Nithya
- Nov 29th, 2006
It is possible using a 'FRIEND'
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ArrayIndexOutOfBoundsException – attempt to access an out of range array index. int x [ ] = new int [ 5 ]; int y = -2; // 1 x [ y ] = 2; // 2 x [ 2 ] = 2; // 3 x [ 5 ] = 5; // 4 System.out.println( x[0] ); // 5 a) Statement 1 and 2 are false b) Statement 2 and 3 are false c) Statement 2 and 4 are false d) Statement 2 and 5 are false
bihag
- Mar 17th, 2007
Cbecause u develope array x[0],x[1],x[2],x[3],x[4]y=-2x[y] ==> give exceptionx[5] ==> give exception
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How can we connect to a database without using connection class?
Srikanth Rao
- Nov 13th, 2006
using DataSources We can Connect to DataBase
srinivasaraobora
- Oct 15th, 2006
Hi,I think it is possible by Hibernate (ORM tool).if any one want example code plz send a mail to id.keeps smiling and mailingbora_srinivasarao@yahoo.co.incell:+919989190898"HELP EVER HURT NEVER"&...
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