java 并发编程(2)

java_thread

原本想都以做菜开饭来讲解这个套 java 并发编程，不过对于那些不做菜的朋友有点太乏味了，也缺乏亲自体验，所以还是多元化，关键是以做菜为例进行讲解在配上美食图，会不会听到不是知识饥渴，而真的变得饥渴了。

starcraft barracks

这个游戏是我的时代游戏，一听就能猜出我大概哪个时代的人了? 也不肯定。游戏过程中我们获取资源，用资源建造兵营，兵营负责出兵进行战斗。

兵营的任务就是建造士兵，所以可以将线程比喻成兵营，代码如下。

• 玩过游戏的人都知道兵数量是有上限的，这里给 50.
• 而且兵是一个一个出。

public class Barracks extends Thread{    private final String name;    private final int MAX = 50;    private int index = 1;    public Barracks(String name) {        this.name = name;    }    @Override    public void run() {        while(index <= MAX){            System.out.println("barrack  " + name + " create warrior: " + (index++));        }    }}

public class ClientB {    public static void main(String[] args) {        Barracks barracks = new Barracks("one");        barracks.start();    }}

为了快速出兵，我们可以建造多个兵营同时出兵。

    public static void main(String[] args) {        Barracks barrackOne = new Barracks("one");        barrackOne.start();        Barracks barrackTwo = new Barracks("two");        barrackTwo.start();        Barracks barrackThree = new Barracks("three");        barrackThree.start();    }

不过从输出来看，由于出兵数量控制业务逻辑放置兵营（线程），这样就带来问题。对兵数量控制应该交个种族而不是兵营

barrack  two create warrior: 2barrack  three create warrior: 3barrack  one create warrior: 1barrack  three create warrior: 5barrack  two create warrior: 4barrack  three create warrior: 7barrack  one create warrior: 6barrack  three create warrior: 9barrack  two create warrior: 8barrack  three create warrior: 11barrack  one create warrior: 10barrack  three create warrior: 13barrack  two create warrior: 12barrack  three create warrior: 15barrack  one create warrior: 14barrack  three create warrior: 17barrack  two create warrior: 16barrack  two create warrior: 20barrack  two create warrior: 21barrack  three create warrior: 19barrack  one create warrior: 18barrack  three create warrior: 23barrack  three create warrior: 25barrack  two create warrior: 22barrack  three create warrior: 26barrack  one create warrior: 24barrack  three create warrior: 28barrack  two create warrior: 27barrack  three create warrior: 30barrack  one create warrior: 29barrack  three create warrior: 32barrack  two create warrior: 31barrack  three create warrior: 34barrack  three create warrior: 36barrack  one create warrior: 33barrack  one create warrior: 38barrack  three create warrior: 37barrack  three create warrior: 40barrack  three create warrior: 41barrack  two create warrior: 35barrack  three create warrior: 42barrack  one create warrior: 39barrack  three create warrior: 44barrack  two create warrior: 43barrack  three create warrior: 46barrack  one create warrior: 45barrack  one create warrior: 49barrack  one create warrior: 50barrack  three create warrior: 48barrack  two create warrior: 47

我们可以把这些业务逻辑冲一个个线程从提取到 Runnable 接口以达到多线程共享。

public class BarrackRunnable implements Runnable{    private int index = 0;    private final static int MAX = 50;    @Override    public void run() {        while(index <= MAX){            System.out.println("barrack  " + Thread.currentThread().getName() + " create warrior: " + (index++));        }    }}

public class ClientC {    public static void main(String[] args) {        final BarrackRunnable barrackRunnable = new BarrackRunnable();        Thread barrackThreadOne = new Thread(barrackRunnable,"one");        Thread barrackThreadTwo = new Thread(barrackRunnable,"two");        Thread barrackThreadThree = new Thread(barrackRunnable,"three");        barrackThreadOne.start();        barrackThreadTwo.start();        barrackThreadThree.start();    }}

barrack  one create warrior: 0barrack  one create warrior: 3barrack  one create warrior: 4barrack  one create warrior: 5barrack  one create warrior: 6barrack  one create warrior: 7barrack  one create warrior: 8barrack  one create warrior: 9barrack  one create warrior: 10barrack  one create warrior: 11barrack  one create warrior: 12barrack  one create warrior: 13barrack  one create warrior: 14barrack  one create warrior: 15barrack  one create warrior: 16barrack  one create warrior: 17barrack  one create warrior: 18barrack  two create warrior: 1barrack  two create warrior: 20barrack  two create warrior: 21barrack  two create warrior: 22barrack  one create warrior: 19barrack  one create warrior: 24barrack  one create warrior: 25barrack  one create warrior: 26barrack  one create warrior: 27barrack  one create warrior: 28barrack  one create warrior: 29barrack  one create warrior: 30barrack  one create warrior: 31barrack  two create warrior: 23barrack  two create warrior: 33barrack  two create warrior: 34barrack  one create warrior: 32barrack  one create warrior: 36barrack  two create warrior: 35barrack  two create warrior: 38barrack  two create warrior: 39barrack  one create warrior: 37barrack  one create warrior: 41barrack  two create warrior: 40barrack  two create warrior: 43barrack  one create warrior: 42barrack  one create warrior: 45barrack  one create warrior: 46barrack  one create warrior: 47barrack  one create warrior: 48barrack  one create warrior: 49barrack  one create warrior: 50barrack  two create warrior: 44barrack  three create warrior: 2

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