Method learn

src/test/java/examples/Student.java:36–43

()

        System.out.println(this.toString());
    }
    public void learn() throws Exception{
//        long start = System.currentTimeMillis();
        Random rand = new Random();
        int time =  rand.nextInt(1000)+3000;
        Thread.sleep(time);
//        long end = System.currentTimeMillis();
//        System.out.println(end-start);
    }
    public static void main(String[] args) {
        Student s  = new Student();
        s.display();