class Printer{    int index=0;    //输出奇数    public synchronized void printA(int a)    {        while(index%2==0)        {            try {                this.wait();            } catch (InterruptedException e) {                // TODO Auto-generated catch block                e.printStackTrace();            }        }        index++;        System.out.println(a);        notify();            }    public  synchronized void printB(char b)    {        while(index%2!=0)        {            try {                this.wait();            } catch (InterruptedException e) {                // TODO Auto-generated catch block                e.printStackTrace();            }        }        index++;        System.out.println(b);        notify();            }    }public class 多线程1 {    public static void main(String args[])    {        Printer p=new Printer();        Thread t1=new Thread(new A(p));        Thread t2=new Thread(new B(p));        t1.start();        t2.start();                                    }    }class A implements Runnable{    Printer p=null;    public A(Printer p)    {        this.p=p;    }    @Override    public void run() {        // TODO Auto-generated method stub        for(int i=1;i<=26;i++)        {        p.printA(i);        }                    }        }class B implements Runnable{    Printer p=null;    public B(Printer p)    {        this.p=p;    }    public void run() {        // TODO Auto-generated method stub        for(char c=‘a‘;c<=‘z‘;c++)        {        p.printB(c);        }                    }        }