class_method__类方法

Author: CPU-Code

README.md

@@ -2,7 +2,7 @@
  * @由于个人水平有限, 难免有些错误, 还请指点:  
  * @Author: cpu_code
  * @Date: 2020-07-12 12:03:11
- * @LastEditTime: 2020-09-12 21:44:12
+ * @LastEditTime: 2020-09-12 23:28:40
  * @FilePath: \java\README.md
  * @Gitee: [https://gitee.com/cpu_code](https://gitee.com/cpu_code)
  * @Github: [https://github.com/CPU-Code](https://github.com/CPU-Code)
@@ -131,6 +131,20 @@ java编程基础 面向对象 javaAPI 集合 IO GUI JD8C 多线程 网络编程
 - [x] [concat_string__拼接字符串](javaAPI/String/concat_string.java)
 - [x] [charAt_String__统计字符个数](javaAPI/String/charAt_String.java)
 
+### [static](javaAPI/static)
+
+- [x] [class_variable__类变量](javaAPI/static/class_variable.java)
+- [x] [class_method__类方法](javaAPI/static/class_method.java)
+
+
+### [Arrays](javaAPI/Arrays)
+
+
+
+### [Math](javaAPI/Math)
+
+
+
 -----------------------
 
 ## [异常处理]()

javaAPI/Static/class_method.java

@@ -0,0 +1,61 @@
+/*
+ * @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
+*/

javaAPI/Static/class_variable.java

@@ -0,0 +1,49 @@
+/*
+ * @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 22:29:45
+ * @LastEditTime: 2020-09-12 22:38:27
+ * @FilePath: \java\javaAPI\static\class_variable.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_variable {
+    public static void main(String[] args){
+        Student s1 = new Student("cpucode", 22);
+        Student s2 = new Student("cpu", 21);
+
+        s1.show();
+        s2.show();
+    }
+}
+
+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);
+    }
+}
+
+/*
+Student: name = cpucode, age = 22, sid = 1
+Student: name = cpu, age = 21, sid = 2
+*/