1 public class Student {
 2     //静态的数据
 3     private String name;
 4     private int Id;
 5     private String gender;
 6     private int weight;
 7     
 8     
 9     //动态的行为
10     public void study(){
11         System.out.println(name + "在学习");//创建的对象 在学习
12     }
13     public void sayHello(String sname){
14         System.out.println(name + "向" + sname +"说：你好！！");//创建的对象向 谁 说： 你好！
15     }
16     public static void main(String[] args) {
17         Student s1 = new Student();
18         s1.name = "张强";
19         s1.study();
20         s1.sayHello("小明");
21     }
22 }