Different ways to write singleton in Java - Stack Overflow Initialization on Demand Holder (IODH) idiom...

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Different ways to write singleton in Java - Stack Overflow



Initialization on Demand Holder

(IODH) idiom which requires very

little code and has zero

synchronization overhead. Zero, as in

even faster than volatile. IODH

requires the same number of lines of

code as plain old synchronization, and

it's faster than DCL!





IODH utilizes lazy class

initialization. The JVM won't execute

a class's static initializer until you

actually touch something in the class.

This applies to static nested classes,

too. In the following example, the

JLS guarantees (Link->http://ift.tt/1wzGxaU) the JVM will not

initialize instance until someone

calls getInstance():

static class SingletonHolder {

static Singleton instance = new Singleton();

}

public static Singleton getInstance() {

return SingletonHolder.instance;

}

http://ift.tt/1GEOdLY

Done

Different ways to write singleton in Java - Stack Overflow

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