/**
* Java线程：线程的同步-同步代码块
*
* @author leizhimin 2009-11-4 11:23:32
*/
public class Test {
        public static void main(String[] args) {
                User u = new User("张三", 100);
                MyThread t1 = new MyThread("线程A", u, 20);
                MyThread t2 = new MyThread("线程B", u, -60);
                MyThread t3 = new MyThread("线程C", u, -80);
                MyThread t4 = new MyThread("线程D", u, -30);
                MyThread t5 = new MyThread("线程E", u, 32);
                MyThread t6 = new MyThread("线程F", u, 21);

                t1.start();
                t2.start();
                t3.start();
                t4.start();
                t5.start();
                t6.start();
        }
}

class MyThread extends Thread {
        private User u;
        private int y = 0;

        MyThread(String name, User u, int y) {
                super(name);
                this.u = u;
                this.y = y;
        }

        public void run() {
                u.oper(y);
        }
}

class User {
        private String code;
        private int cash;

        User(String code, int cash) {
                this.code = code;
                this.cash = cash;
        }

        public String getCode() {
                return code;
        }

        public void setCode(String code) {
                this.code = code;
        }

        /**
         * 业务方法
         *
         * @param x 添加x万元
         */
        public void oper(int x) {
                try {
                        Thread.sleep(10L);
                        synchronized (this) {
                                this.cash += x;
                                System.out.println(Thread.currentThread().getName() + "运行结束，增加“" + x + "”，当前用户账户余额为：" + cash);
                        }
                        Thread.sleep(10L);
                } catch (InterruptedException e) {
                        e.printStackTrace();
                }
        }

        @Override
        public String toString() {
                return "User{" +
                                "code='" + code + '"'' +
                                ", cash=" + cash +
                                '}';
        }
}

线程E运行结束，增加“32”，当前用户账户余额为：132
线程B运行结束，增加“-60”，当前用户账户余额为：72
线程D运行结束，增加“-30”，当前用户账户余额为：42
线程F运行结束，增加“21”，当前用户账户余额为：63
线程C运行结束，增加“-80”，当前用户账户余额为：-17
线程A运行结束，增加“20”，当前用户账户余额为：3

Process finished with exit code 0