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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();
}
}
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