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 Student16 {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 }