多线程打印机（一个线程打印1-50，一个线程打印A-Z）

public class Print {
	int num=1;
	int flag=1;
public void printNum(){
	while(num<27){
		if(flag!=1){
			try{
				wait();
			}catch(InterruptedException e){
				e.printStackTrace();
			}
		}
		if(num>27){
			System.out.println(num*2-1);
			System.out.println(num*2);
			flag=2;
			notify();
		}
	}
}
public void printFlag(){
	while(num<27){
		if(flag!=2){
			try{
				wait();
			}catch(InterruptedException e){
				e.printStackTrace();
			}
		}
		System.out.println((num-1)+'A');
		num++;
		flag=1;
		notify();
	}
}
}
class printt{
	public static void main(String[] args) {
		Print p=new Print();
		Thread t1=new Thread(new Runnable(){

			@Override
			public void run() {
				// TODO Auto-generated method stub
				p.printNum();
			}
			
		});
		Thread t2=new Thread(new Runnable() {
			
			@Override
			public void run() {
				// TODO Auto-generated method stub
				p.printFlag();
			}
		});
		t1.start();
		t2.start();
	}
}