public class Main {    public static void main(String[] args) {        // TODO Auto-generated method stub                MutiThread t=new MutiThread();                Thread t1=new Thread(t);                                /*多线程断点调试，错误结果,如果在此处执行断点，t1执行完毕，numa回复正确状态-------此处注意*/                t1.start();                                for(int i=0;i<5;i++){                    new Thread(t).start();                }                t1.stop();    }}public class MutiThread  implements Runnable {    int numa=0;    @Override    public void run() {        // TODO Auto-generated method stub        synchronized (this) {            numa++;            try{                Thread.sleep(1000);            }catch(Exception e){                e.printStackTrace();            }            numa--;            String stn=Thread.currentThread().getName();            System.out.println(stn+"  numa= " + numa);        }    }    }