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class_method.java
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61 lines (51 loc) · 1.61 KB
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/*
* @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
*/