1、想了解不同類(lèi)型線(xiàn)程之間的關(guān)系（此程序沒(méi)考慮線(xiàn)程安全問(wèn)題），想模擬電腦是怎樣執(zhí)行多線(xiàn)程，但是得到一個(gè)莫名奇妙的結(jié)果。思考了很長(zhǎng)時(shí)間，還是沒(méi)有解決，希望能得到幫助；

2、代碼如下

   public class StudentDemo {
        public static void main(String[] args) {
            Student s = new Student();

            SetThread st = new SetThread(s);
            GetThread gt = new GetThread(s);
        
            Thread t1 = new Thread(st, "SetTread");
            Thread t2 = new Thread(gt,"GetTread");
        
            t2.start();
            t1.start();
        }
    }

    public class Student {
        public String  name;
        public int age;
    }

    public class SetThread implements Runnable{
        private Student s;

        public SetThread(Student s) {
            this.s = s;
        }

        @Override
        public void run() {
           s.name = "jzian";
           s.age = 27;
        }
    }

    public class GetThread implements Runnable {
        private Student s;

        public GetThread(Student s) {
           this.s = s;
        }

        @Override
        public void run() {
            System.out.println( s.name + "-----" + s.age);
        }
    }

3、得到的結(jié)果為：
null----27
請(qǐng)問(wèn)是怎樣得到這樣的結(jié)果的？