How do I restrict object creation not more than 3 in Java class?

Question

How do I restrict object creation not more than 3 in Java class?

Can you give me an idea of how I can to do it?

Answer 1

Instanciate your class via a factory (see design patterns) and limit it to 3 instances using a simple counter.

Answer 2

You need Modified Singleton. See this - same http://stackoverflow.com/questions/2323814/oops-design-patterns

Answer 3

Factory pattern is the way to go. Or a static counter can be used. Need to careful about thread safety.

Answer 4

You can also have a look at ObjectPool of Apache Commons. The source code is freely available...