Java多線程順序執行

此方法實現java多線程順序執行,依賴的是LinkedList < Runnable > ,因爲鏈表裏的元素是有序的,先放進去的先出來,所以最先進去的CreateTaskByThread最先出來. 其次consumptionThread 線程監聽tasks裏面放進去的任務,類似於消費者,如果有任務的話會立即執行,消費掉tasks裏面的任務;productionThread 線程負責向LinkedList 鏈表裏增加任務(每隔2s增加一個任務),這樣呢就簡單模仿了一個多線程順序執行的一個案例

import java.util.LinkedList;

public class MultithreadedOrder {

    //鏈表
    private volatile static LinkedList<Runnable> tasks = new LinkedList<Runnable>();

    public static void main(String[] args){
        //開始執行,輸出,現在鏈表裏插入10個 runnable 執行
        System.out.println("start");
        for (int i = 0; i < 10; i++) {
            excuteTime();
        }
        System.out.println("end");

        //消費者  執行鏈表裏的任務,消耗鏈表裏的任務
        Thread consumptionThread = new Thread(){
            @Override
            public void run(){
                while(true){
                    try {
                        Thread.sleep(1);
                    } catch (InterruptedException e) {

                    }
                    if (!tasks.isEmpty()) {
                        final Runnable task;
                        synchronized (tasks) {
                            task = tasks.getFirst();
                        }
                        try {
                            System.out.println("LinkedList-tasks size:"+tasks.size());
                            task.run();
                        } catch (Exception ex) {
                            //throw ex;
                            System.out.println(ex);
                        } finally {
                            synchronized (tasks) {
                                tasks.removeFirst();
                            }
                        }
                    }

                }
            }

        };
        consumptionThread.start();

        //生產者 負責向鏈表裏面添加 runnable
        Thread productionThread = new Thread() {
            @Override
            public void run() {
                while(true) {
                    try {
                        Thread.sleep(2000);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                    CreateTaskByThread createTaskByThread = new CreateTaskByThread();
                    tasks.add(createTaskByThread);
                }
            }
        };
        productionThread.start();
    }

    public static void excuteTime(){
        CreateTaskByThread createTaskByThread = new CreateTaskByThread();
        tasks.add(createTaskByThread);
    }

}

class CreateTaskByThread implements Runnable{
    private static  int i = 0;
    @Override
    public void run() {
        System.out.println("best_"+ i++);
    }
}