CSS font stacks & developer FAQs with Web standards
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A: To count all instances of a class you should create a static int variable to store the number of instances and include an increment statement in all constructors. You must also implement a final finalize() method that is called upon garbage collection to decrement the count. And since multiple instances may increment and decrement the static value in separate threads, these statements should be enclosed in a synchronized block, as in the example below.
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How can I count the number of instances of an object?