Create java class not collectable by GC -

i want create class: - have 1 instance - accesible during lifetime of app. - class not have destroyed garbage collector.

can achive using static, or singleton pattern?

thanks

the way ensure class cannot garbage collected ensure remains reachable. could:

• refer in class reachable,
• load in initial classloader (which reachable),
• put instance of class variable remains reachable,
• etcetera.

in practice, unless class dynamically loaded using classloader created yourself, unlikely class unloaded / destroyed gc.

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on other hand ... if concerned singleton instance (not class) being garbage collected, normal implementation of singleton design pattern takes care of that:

public class mysingleton {     private static integer instance = new integer(42);      public static integer getinstance() {         return instance;     } } 

the static variable reachable long mysingleton class remains reachable ... lifetime of application run; see above.

a public static variable work too, though bad idea other perspectives.