TIJ读书笔记-第21章-并发

一本Think in java，从去年6月份开始读，读了快一年了，也快读完了，然而回头想想，却好像什么也不记得了，好记性不如烂笔头，那就从现在开始记录一下吧。由于现在在读的是并发，那就先从这章开始吧。（由于是个人学习笔记，不是教程什么的，不会特别全面，如果有什么错误，还望大神指出）

一，线程的实现方式

1.实现Runnable接口

package com.pikzas.cocurrent;

/**
 * Created by pikzas on 2017/5/22.
 */
public class LiftOff implements Runnable {
    protected int countDown = 10;
    private  static int taskCount = 0;
    private final int id = taskCount++;
    public LiftOff(){}
    public LiftOff(int countDown){
        this.countDown = countDown;
    }
    private String status(){
        return "#" + id + "(" + (countDown > 0? countDown:"LiftOff!") + "),";
    }
    public void run() {
        while(countDown-->0){
            System.out.print(status());
            Thread.yield();
        }
    }

    public static void main(String[] args) {
        LiftOff liftOff = new LiftOff();
        liftOff.run();
    }
}

2.继承Thread类

package com.pikzas.cocurrent;

/**
 * Created by pikzas on 2017/5/22.
 */
public class LiftOffThread extends Thread {
    protected int countDown = 10;
    private static int taskCount = 0;
    private final int id = countDown++;
    public LiftOffThread(){
        System.out.println("i am running!");
    }
    public LiftOffThread(int countDown){
        this.countDown = countDown;
    }
    public String status(){
        return "*" + id + "(" + (countDown>0? countDown:"LiftOffAgain") + ")";
    }

    public static void main(String[] args) throws InterruptedException {
        System.out.println("waiting for liftoff");
        for (int i=0;i<5;i++){
            Thread thread = new Thread(new LiftOffThread());
            thread.start();
        }
    }
}

3.线程的启动

　　3.1. Thread thread = new Thread();

　　　　　　thread.run();　　//会等待当前调用线程任务执行完成后在启动

　　　　　　thread.start();　　//会立即启动执行

二，线程的管理--Executor