Java 多线程问题例子

package SixthChapterXianCheng;class Ck {    private char[] rl = new char[8];    private int wp = 0;    public synchronized void shengchan(char aa)    {        while (wp == rl.length)        {            try            {                this.wait();            }            catch (Exception e){}        }        this.notify(); //叫醒另一个线程。是在当前线程处于就绪状态的前提下        rl[wp] = aa;        ++wp;        System.out.println("生产线程正在生产第"+wp+"个产品，该产品是:"+aa);    }    public synchronized void xiaofei()    {        char aa;        while (wp == 0)        {            try            {                this.wait();            }            catch (Exception e){}        }        this.notify();        aa = rl[wp-1];        System.out.println("消费线程正在消费第"+wp+"个产品，该产品是:"+aa);        --wp;           }   }class Sc implements Runnable{    private Ck xc = null;    public Sc(Ck xc)//用于初始化对象，一旦创建Sc对象后就会初始化，就会传进来一个Sc类    {        this.xc = xc;    }    public void run()//run方法是两个线程，同时执行    {        char aa;        for (int i=0; i<26; i++)        {            aa = (char)('A'+i);            xc.shengchan(aa);        }    }}class Xf implements Runnable{    private Ck xc = null;    public Xf(Ck xc)    {        this.xc = xc;    }    public void run()    {        for (int i=0; i<26; i++)        {            xc.xiaofei();        }    }}public class L6_12{    public static void main(String[] args)    {        Ck ck = new Ck();        Sc sc = new Sc(ck);        Xf xf = new Xf(ck);        Thread xc1 = new Thread(sc);        xc1.start();        Thread xc2 = new Thread(xf);        xc2.start();    }}

//run方法是两个线程，同时执行。两个run方法又调用两个方法【xc.shengchan(aa); xc.xiaofei();】因此是被调用的两个方法分为两个
//线程去同时执行。两个同时执行的方法被synchronized 修饰，一次性执行完。