스레드 병발의 주 스레드와 수호 스레드 통신 방식

package policequerytest.test;

import java.util.concurrent.TimeUnit;

/**
 *
 * @author User
 */
public class Test2 {

    public static void main(String[] args) {
        Data data = new Data();

        MainThread mainThread = new MainThread(data);
        mainThread.run();
    }

    private static class MainThread implements Runnable {

        private Data data;

        public MainThread(Data data) {
            this.data = data;
        }

        @Override
        public void run() {
            int plus = data.plus();
            Thread childThread = new Thread(new ChildThread(Thread.currentThread(), data));
            childThread.setDaemon(false);
            childThread.start();
            System.out.println(Thread.currentThread().getName() + "---" + plus);
            try {
                TimeUnit.MILLISECONDS.sleep(10000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }

    private static class ChildThread implements Runnable {

        private Thread mainThread;
        private Data data;

        public ChildThread(Thread mainThread, Data data) {
            this.mainThread = mainThread;
            this.data = data;
        }

        @Override
        public void run() {
            while (mainThread.isAlive()) {
                int reduce = data.reduce();
                System.out.println(Thread.currentThread().getName() + "---" + reduce);
                try {
                    TimeUnit.MILLISECONDS.sleep(1000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }
    }

    /**
     *  ： 
     */
    private static class Data {

        private int i = 50;

        public String getTicket() {
            return ticket;
        }

        public void setTicket(String ticket) {
            this.ticket = ticket;
        }
        private String ticket;

        public synchronized int plus() {
            return i++;
        }

        public synchronized int reduce() {
            return i--;
        }
    }
}