线程定制调度，

需求：模拟3*10mi的接力赛，分别有三个线程，A ， B，C 分别打印1 - 10 ， 11 - 20 ， 21 - 30 并且完成线程的顺序交替打印。实现代码如下：

其实可以使用jon来实现，但是这样做的效率并不是很高。

package hello_java;

import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

public class Customize_Thread {
    public static void main(String[] args) {
        ShareData shareData = new ShareData();

        new Thread(() -> {
            shareData.print10();
        },"A").start();

        new Thread(() -> {
            shareData.print20();
        },"C").start();

        new Thread(() -> {
            shareData.print30();
        },"B").start();
    }
}

class ShareData{
    public int flag = 1;
    private Lock lock = new ReentrantLock();
    private Condition condition1 = lock.newCondition();
    private Condition condition2 = lock.newCondition();
    private Condition condition3 = lock.newCondition();

    public void  print10(){
        lock.lock();
        try {
            while(flag != 1){
                condition1.await();
            }
            for (int i = 1; i <= 10; i++) {
                System.out.println(i);
            }
            flag = 2;
            condition2.signal();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            lock.unlock();
        }
    }
    public void  print20(){
        lock.lock();
        try {
            while(flag != 2){
                condition2.await();
            }
            for (int i = 11; i <= 20; i++) {
                System.out.println(i);
            }
            flag = 3;
            condition3.signal();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            lock.unlock();
        }
    }
    public void  print30(){
        lock.lock();
        try {
            while(flag != 3){
                condition3.await();
            }
            for (int i = 21; i <= 30; i++) {
                System.out.println(i);
            }
            flag = 3;
            condition1.signal();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            lock.unlock();
        }
    }

}

运行结果如下：

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30

Process finished with exit code 0

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