public class Wacky1 extends Thread {   // Correct Version

    static private int n=0;   // shared counter
    private int count;  //  how long to run;

    public Wacky1(int i) { count = i; }

    static synchronized public void inc() {
        int j = n+1;
        try { sleep((int)(Math.random() * 10)); }  catch (InterruptedException e) {}
        n = j;
        try { sleep((int)(Math.random() * 10)); }  catch (InterruptedException e) {}
    }

    public static void main(String[] args) {
       Thread t1 = new Wacky1(100);
       Thread t2 = new Wacky1(100);
       Thread t3 = new Wacky1(100);
       t1.start(); t2.start(); t3.start();
       try {
          t1.join(); t2.join(); t3.join();
       }  catch (InterruptedException e) {}
       System.out.println("Final value " + n);
    }
    public void run() {
        for (int i = 0; i < count; i++) {
            inc();
        }
    }
}