Implementation of Join() method of Thread

Implementation of Join()


public class MyReader {

    BufferedReader b;

    public MyReader() {
        b = new BufferedReader(new InputStreamReader(System.in));
    }
    public String readData(String msg){
        String str;
        try{
            System.out.println(msg);
            str=b.readLine();
            return str;
        }catch(Exception e){System.out.println(e);}
        return null;
    }
}

public class NameThread extends Thread{
final MyReader r;
public NameThread(MyReader reader){
    r=reader;
}
    @Override
public void run(){
        synchronized(r){
            String name=r.readData("Enter name");
    System.out.println("Hello,"+name);
        }
  
}
}
public class MailThread extends Thread{
final MyReader r;
public MailThread(MyReader reader){
    r=reader;
}
    @Override
public void run(){
        synchronized(r){
    String mailId=r.readData("Enter mailId");
    System.out.println("your EmailId "+mailId);
        }
  
}

}
public class ReaderTest {

    public static void main(String as[]) throws Exception{
        MyReader m = new MyReader();
        NameThread nt = new NameThread(m);
        MailThread mt = new MailThread(m);
        nt.start(); // NameThread is started(call made for run method of Name thread  by jvm)
        mt.start(); //MailThread is started(call made for run method of Mail thread  by jvm)
        mt.join();//suspend current thread(main thread) till mailThread not complete
        nt.join();//suspend current thread(main thread) till NameThread not complete

        System.out.println("Execution from main start...!");
    }
}

That means join used to start a thread (mt, nt) and again calling join(mt, nt) to stop current thread(main thread) by providing priority to currently started thread.