关于类的创建和调用

 1 public class ObjectStudent {
 2 
 3     //创建成员变量
 4     String name;
 5     String sex;
 6     String stuNo;
 7     int age;
 8     
 9     public void study(){
10         
11         System.out.println("学生正在学习");
12     }
13     
14     public void play(){
15         
16         System.out.println("学生正在玩耍");
17     }

 1     public static void main(String[] args) {
 2         
 3         ObjectStudent o = new ObjectStudent();
 4         o.name  = "王大锤";
 5         o.sex = "男";
 6         o.stuNo = "250250";
 7         o.age = 25;
 8         
 9         System.out.println(o.name );
10         System.out.println(o.sex);
11         System.out.println(o.stuNo);
12         System.out.println(o.age );
13         
14         o.play();
15         o.study();