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public class Foo { 
    private int x = 100; 
    public int getX() { 
        return x; 
    } 
    public int fix(int y) { 
        x = x - y; 
        return x; 
    } 
}
 
public class MyRunnable implements Runnable { 
    private Foo foo = new Foo(); 
    public static void main(String[] args) { 
        MyRunnable r = new MyRunnable(); 
        Thread ta = new Thread(r, "Thread-A"); 
        Thread tb = new Thread(r, "Thread-B"); 
        ta.start(); 
        tb.start(); 
    } 
    public void run() { 
        for (int i = 0; i < 3; i++) { 
            this.fix(30); 
            try { 
                Thread.sleep(1); 
            } catch (InterruptedException e) { 
                e.printStackTrace(); 
            } 
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