java 线程同步 synchronized

public class Test {

private int i = 0;

public Test() {

}

public int getI() {
    return i;
}

public void setI(int i) {
    this.i = i;
}

public static void main(String[] args) throws InterruptedException {
    Test t = new Test();
    Thread tt1 = new Thread(new TestThread(t));
    Thread tt2 = new Thread(new TestThread(t));
    Thread tt3 = new Thread(new TestThread(t));
    Thread tt4 = new Thread(new TestThread(t));
    tt1.start();
    tt2.start();
    tt3.start();
    tt4.start();
    tt1.join();
    tt2.join();
    tt3.join();
    tt4.join();
    System.out.println("ok");
}

}

public class TestThread implements Runnable {

Test t;

public TestThread (Test t) {
    this.t = t;
}

public synchronized void run() {
    t.setI(t.getI() + 10);
    System.out.println(t.getI());
}

}

 输出:
30
30
40
40
ok

问题 :
想要得到输出10 20 30 40,为什么加了synchronized还不行

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code_monkey_sun
codeMonkey_sun
2017/07/13 09:06
  • synchronized
  • java
  • 线程
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