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/**
* JavaỊ̈߳º²¢·¢Ð­×÷-ËÀËø
*
* @author Administrator 2009-11-4 22:06:13
*/
public class Test {
        public static void main(String[] args) {
                DeadlockRisk dead = new DeadlockRisk();
                MyThread t1 = new MyThread(dead, 1, 2);
                MyThread t2 = new MyThread(dead, 3, 4);
                MyThread t3 = new MyThread(dead, 5, 6);
                MyThread t4 = new MyThread(dead, 7, 8);
                t1.start();
                t2.start();
                t3.start();
                t4.start();
        }
}
class MyThread extends Thread {
        private DeadlockRisk dead;
        private int a, b;
        MyThread(DeadlockRisk dead, int a, int b) {
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{
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  //1.nullµÄ±È½Ï£ºÖ»ÄÜÓÃ==
  System.out.println("1.nullµÄ±È½Ï£ºÖ»ÄÜÓÃ==");
  Object o1=null,o2=null;
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public class Foo {
    private int x = 100;
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