creating object

[kaushik saha]

Is it possible in java to create an object without using new keyword.
If it is then how is it possible?

[Campbell Ritchie]

More of a beginner's question.

Yes.

Use a factory method.

Foo myFoo = FooFactory.makeFoo();
 
. . .
 
public class FooFactory
{
 . . .
   public static Foo makeFoo(String className)
   {
      return (Foo)Class.forName(className).getInstance();
   }//end make foo
}

. . . or something like that.
[ March 20, 2007: Message edited by: Campbell Ritchie ]

[Urs Waefler]

Hi

Have a look at the following source code:


class A {

public static void main (String [] args) {

int [] B = new int [2];
B [0] = 5;
B [1] = 6;

int [] C = {7,8};

}
}


An array is an object. There are two arrays. There is an explicit memory allocation. This is array B. There is an implicit memory allocation. This is array C.

Regards
Urs

[Garrett Rowe]

String s = "Hello World";

That works because the compiler treats Strings specially.

[Stan James]

Do some searching on Java reflection and serialization. Let us know if you find more ways to create object instances.

[Anupam Sinha]

You can create objects without using the new operator atleast in the following ways.

1. Reflection
2. Serialization
3. getInstance() method but that would most probably be using the constructor somewhere.
4. Cloning

There might exist other ways also.