JAVA多线程同步的简单例子（—）

来源：互联网发布：不一样的天空知乎编辑：程序博客网时间：2024/06/06 06:39

public class TestThread {
            public static void main(String[] args) {
                    BankCard b = new BankCard();//4个线程共享数据，将这个对象传给4个线程，而不是在线程中new
                        Parent p1 = new Parent("爸爸",1000,b);
                        Parent p2 = new Parent("妈妈",1000,b);
                        Child c1 = new Child("孩子1",300,b);
                        Child c2 = new Child("孩子2",500,b);
                        Thread t1 = new Thread(p1);
                        Thread t2 = new Thread(p2);
                        Thread t3 = new Thread(c1);
                        Thread t4 = new Thread(c2);
                        t1.start();t2.start();t3.start();t4.start();
            }
}
class BankCard {
             int sum=0;
             public synchronized void save(String s,int count) throws Exception{
                         while(sum > 3000) {
                                          System.out.println(s+"你等等，已经有足够存款了");
                                          this.wait();
                          }
                          this.sum += count;
                            notifyAll();
                            System.out.println(s+"村了"+count+"块钱,孩子们，快来取用吧");
              }
              public synchronized void disposit(String s,int count) throws Exception {
                            while(sum < count) {
                          System.out.println(s+"你等等，钱不够了");
                          this.wait();
                          }
                          this.sum -= count;
                          notifyAll();
                            System.out.println(s+"取出了"+count+"块钱");

              }
}
class Parent implements Runnable {
            String s;        int count; BankCard b;
            Parent(String s,int count,BankCard b) {
                    this.s = s;
                    this.count = count;
                    this.b = b;
            }
            public void run() {
                        while(true) {
                            try{
                                    b.save(s,count);
                                    Thread.sleep(2000);
                                }
                                catch(Exception e) {
                            }
                        }
            }
}
class Child implements Runnable {
            String s;        int count; BankCard b;
            Child(String s,int count,BankCard b) {
                    this.s = s;
                    this.count = count;
                    this.b = b;
            }
            public void run() {
                        while(true) {
                                try {
                                    b.disposit(s,count);
                                    Thread.sleep(2000);
                                }
                                catch(Exception e) {
                            }
                        }
            }
}