作业-----改进后的类与对象学生题目

 1 public class Test3
 2 {
 3     public static void main(String[] args)
 4     {
 5         Student s1=new Student(10,"貂蝉",18);
 6         Student s2=new Student(11,"西施",17);
 7         Student s3=new Student(-12,"刘欢",-18);
 8         s2.setNumber(-10);
 9         System.out.println(s1.getInfo());
10         System.out.println(s2.getInfo());
11         System.out.println(s3.getInfo());
12     }
13 }
14 
15 class Student
16 {
17     private int number;
18     private String name;
19     private int age;
20 
21     Student(int number,String name,int age)
22     {
23         this.setNumber(number);
24         this.setName(name);
25         this.setAge(age);
26     }
27     
28     public void setNumber(int number)
29     {
30         if(number>=1)
31         this.number=number;
32     }
33     public int getNumber()
34     {
35         return number;
36     }
37     public void setName(String name)
38     {
39         this.name=name;
40     }
41     public String getName()
42     {
43         return name;
44     }
45     public void setAge(int age)
46     {
47         if(age>=0&&age<135)
48         this.age=age;
49     }
50     public int getAge()
51     {
52         return age;
53     }
54     
55     public String getInfo()
56     {
57         return "学号："+this.getNumber()+"，姓名："+this.getName()+"，年龄："+this.getAge();
58     }
59 }