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Static object

Dev Cunningham
Greenhorn

Joined: Oct 12, 2001
Posts: 9
What's the best way to create an instance of a Java class that 'globally' available throughout my application? For instance, with C++ I might create an object when my application starts and store a pointer to that object in a global variable.
In this case, I am creating a hash table, which is useful to many parts of my application. Obviously I don't want to create the hash table each time I need to use it.
Thanks!!
Greg Brouelette
Ranch Hand

Joined: Jan 23, 2002
Posts: 144
Do a quick search for "Singleton" on this board.
A "Singleton" object is an object designed in such a way that you can't actually make a new instance of it. You use a static getInstance() method instead. If this is the first time that the getInstance method was called then the object is constructed. On the 2nd and subsequent time that it's called then the method returns the already constructed object.
Here's an example:

[ May 15, 2002: Message edited by: Greg Brouelette ]

For a good Prime, call:<br />29819592777931214269172453467810429868925511217482600306406141434158089
Dev Cunningham
Greenhorn

Joined: Oct 12, 2001
Posts: 9
Thanks Greg!!
That looks perfect.
 
It is sorta covered in the JavaRanch Style Guide.
 
subject: Static object
 
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