/*

* @由于个人水平有限, 难免有些错误, 还请指点:

* @Author: cpu_code

* @Date: 2020-09-12 23:28:50

* @LastEditTime: 2020-09-12 23:29:24

* @FilePath: \java\javaAPI\Static\class_method.java

* @Gitee: [https://gitee.com/cpu_code](https://gitee.com/cpu_code)

* @Github: [https://github.com/CPU-Code](https://github.com/CPU-Code)

* @CSDN: [https://blog.csdn.net/qq_44226094](https://blog.csdn.net/qq_44226094)

* @Gitbook: [https://923992029.gitbook.io/cpucode/](https://923992029.gitbook.io/cpucode/)

*/

package javaAPI.Static;

public class class_method {

public static void main(String[] args){

Student s1 = new Student("cpucode", 22);

Student s2 = new Student("cpu", 21);

s1.show();

s2.show();

// 访问类变量

System.out.println(Student.numberOfStudent);

// 调用静态方法

Student.showNum();

}

}

class Student {

private String name;

private int age;

// 学生的id

private int sid;

// 类变量，记录学生数量，分配学号

public static int numberOfStudent = 0;

public Student(String name , int age){

this.name = name;

this.age = age;

// 通过 numberOfStudent 给学生分配学号

this.sid = ++numberOfStudent;

}

// 打印属性值

public void show(){

System.out.println("Student: name = " + name + ", age = " + age + ", sid = " + sid);

}

public static void showNum() {

System.out.println("num == " + numberOfStudent);

}

}

/*

Student: name = cpucode, age = 22, sid = 1

Student: name = cpu, age = 21, sid = 2

2

num == 2

*/