I found way to force finalize() using deprecated since JDK 1.1 method:

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class WebBank {
    boolean loggedIn = false;
    WebBank(boolean logStatus) {
        loggedIn = logStatus;
    }
    void logOut() {
        loggedIn = false;
    }
    protected void finalize() {
        if(loggedIn)
            System.out.println("Error: still logged in");
        // Normally, you'll also call the base-class version:
        // super.finalize();
    }
}
public class BankTest {
    public static void main(String[] args) {
        WebBank bank1 = new WebBank(true);
        WebBank bank2 = new WebBank(true);
        new WebBank(true);
        // Proper cleanup: log out of bank1 before going home:
        bank1.logOut();
        // Forget to logout of bank2 and unnamed new bank
        // Attempts to finalize any missed banks:
        System.out.println("Try 1: ");
        System.runFinalization();
        System.out.println("Try 2: ");
        Runtime.getRuntime().runFinalization();
        System.out.println("Try 3: ");
        System.gc();
        System.out.println("Try 4: ");
        System.runFinalizersOnExit(true);
    }
}
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output:
Try 1:
Try 2:
Try 3:
Try 4:
Error: still logged in
Error: still logged in
-------------------------------
only deprecated runFinalizersOnExit() method worked!
why not the others? even System.gc()?
any other non-deprecated way to force finalization?
Greg