博主的第一个线程同步的例子应该这样举才合适吧
package thread;

public class Foo {
private static int x = 100;

public int getX() {
return x;
}

public int fix(int y) {
x = x - y;
try {
Thread.currentThread().sleep(1);
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println(Thread.currentThread().getName()
＋ " : 当前foo对象的x值=" ＋ getX());
return x;
}
}

package thread;

public class SynchronizedDemo implements Runnable {
private Foo foo = new Foo();

public void run() {
for (int i = 0; i < 100; i＋＋) {
this.fix(30);
}
}

public int fix(int y) {
return foo.fix(y);
}

public static void main(String[] args) {
SynchronizedDemo a = new SynchronizedDemo();
Thread tha = new Thread(a, "A");
Thread thb = new Thread(a, "B");
Thread thc = new Thread(a, "C");
Thread thd = new Thread(a, "D");
Thread the = new Thread(a, "E");
Thread thf = new Thread(a, "F");
Thread thg = new Thread(a, "G");
Thread thh = new Thread(a, "H");
Thread thi = new Thread(a, "I");
Thread thj = new Thread(a, "J");
Thread thk = new Thread(a, "K");
tha.start();
thb.start();
thc.start();
thd.start();
the.start();
thf.start();
thg.start();
thh.start();
thi.start();
thj.start();
thk.start();
}
}