add 类

README.md

@@ -3,3 +3,12 @@
 配套文章
 [【七日阅书】1 计算思维和Java特性《Java程序设计与计算思维》](https://blog.csdn.net/diandianxiyu_geek/article/details/121660902?spm=1001.2014.3001.5501)
 
+[【七日阅书】2 Java的数据类型和流程控制《Java程序设计与计算思维》](https://blog.csdn.net/diandianxiyu_geek/article/details/121681529?spm=1001.2014.3001.5501)
+
+[【七日阅书】3 字符串、数组、集合、泛型《Java程序设计与计算思维》](https://blog.csdn.net/diandianxiyu_geek/article/details/121703793?spm=1001.2014.3001.5501)
+
+
+
+
+
+

demo.iml

 <?xml version="1.0" encoding="UTF-8"?>
 <module org.jetbrains.idea.maven.project.MavenProjectsManager.isMavenModule="true" type="JAVA_MODULE" version="4">
-  <component name="FacetManager">
-    <facet type="web" name="Web">
-      <configuration>
-        <webroots />
-        <sourceRoots>
-          <root url="file://$MODULE_DIR$/src/main/java" />
-          <root url="file://$MODULE_DIR$/src/main/resources" />
-        </sourceRoots>
-      </configuration>
-    </facet>
-    <facet type="Spring" name="Spring">
-      <configuration />
-    </facet>
-  </component>
   <component name="NewModuleRootManager" LANGUAGE_LEVEL="JDK_1_8">
     <output url="file://$MODULE_DIR$/target/classes" />
     <output-test url="file://$MODULE_DIR$/target/test-classes" />

src/main/java/com/example/demo/controller/ClassController.java

+package com.example.demo.controller;
+
+import com.example.demo.tool.Cat;
+import com.example.demo.tool.RagdollCat;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+@RequestMapping("/")
+public class ClassController {
+
+    @GetMapping("/class")
+    public void classDemo(){
+        //对象就是类的实例化
+        Cat tangguo = new Cat();
+        String catName1 =  tangguo.formatName();
+        System.out.print(catName1);
+        System.out.print("\r\n");
+        tangguo.setAge(3); //私有变量通过方法赋值
+        tangguo.name = "糖果"; //公开变量可以直接赋值
+        String catName =  tangguo.formatName();
+        System.out.print(catName);
+        System.out.print("\r\n");
+        tangguo.printAge();
+    }
+
+    @GetMapping("/extends")
+    public void extendsDemo(){
+        RagdollCat ragdollCat = new RagdollCat();
+        ragdollCat.name = "小布";
+        ragdollCat.say();
+        String catName =  ragdollCat.formatName();
+        System.out.print(catName);
+        System.out.print("\r\n");
+
+        System.out.print
+    }
+}

src/main/java/com/example/demo/tool/Cat.java

+package com.example.demo.tool;
+
+public class Cat { //公共的类
+
+    public Cat(){ //构造函数
+        System.out.print("我是构造函数，实例化的时候自动调用\r\n");
+        name = "默认猫名字";
+    }
+
+    private int age = 1; //私有变量 默认值
+    public String name; //公开变量
+
+    public void setAge(int age){
+        this.age = age;
+    }
+
+    public void printAge(){
+        System.out.print(age);
+    }
+
+    public String formatName(){ //公开方法
+        return  "猫的名字是："+ name; //返回值
+    }
+}

src/main/java/com/example/demo/tool/RagdollCat.java

+package com.example.demo.tool;
+
+/**
+ * 布偶猫是猫的子类，继承了猫类
+ */
+public class RagdollCat extends Cat {
+
+    //重写了方法
+    public String formatName(){
+        return  "布偶猫的名字是："+ name + "\r\n";
+    }
+
+    //子类扩展出了新的方法
+    public void say(){
+        System.out.print("我是布偶猫\r\n");
+    }
+}