add abstract interface

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

+package com.example.demo.controller;
+
+import com.example.demo.tool.TianjinCat;
+import com.example.demo.tool.TjCat;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+/**
+ * 抽象
+ */
+@RestController
+@RequestMapping("/")
+public class AbstractController {
+
+    @GetMapping("/abstract")
+    public void abstractDemo(){
+        TjCat tjCat = new TjCat();
+        tjCat.run();
+        tjCat.jump();
+        tjCat.kuaiban();
+    }
+
+    @GetMapping("/interface")
+    public void interfaceDemo(){
+        TianjinCat tianjinCat = new TianjinCat();
+        tianjinCat.eat();
+        tianjinCat.jump();
+        tianjinCat.run();
+    }
+}

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

@@ -33,7 +33,5 @@ public class ClassController {
         String catName =  ragdollCat.formatName();
         System.out.print(catName);
         System.out.print("\r\n");
-
-        System.out.print
     }
 }

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

+package com.example.demo.tool;
+
+/**
+ * 猫的抽象类
+ */
+abstract class CatAbstract {
+
+    //构造函数
+    CatAbstract(){
+        System.out.print("我是抽象类的构造函数\r\n");
+    }
+
+    abstract public void jump(); //抽象方法，没有具体实现
+
+     public void run(){
+         System.out.print("我是抽象类的函数，跑起来了！\r\n");
+     }
+
+
+}

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

+package com.example.demo.tool;
+
+/**
+ * 猫的接口类
+ */
+interface CatInterface {
+
+    void run(); //由于必须所有方法都是public,所以public没必要写上
+
+    void jump();
+}

src/main/java/com/example/demo/tool/CatInterface2.java

+package com.example.demo.tool;
+
+interface CatInterface2 {
+
+    int tailNum = 1;
+
+    void eat();
+}

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

+package com.example.demo.tool;
+
+/**
+ * 接口类的实现，支持实现多接口
+ */
+public class TianjinCat implements CatInterface,CatInterface2 {
+    @Override
+    public void run() {
+        System.out.print("我可跑了啊\r\n");
+    }
+
+    @Override
+    public void jump() {
+        System.out.print("我有"+ String.valueOf(tailNum) +"条尾巴！\r\n");
+        System.out.print("我可跳了啊\r\n");
+    }
+
+    @Override
+    public void eat() {
+        System.out.print("我可吃了啊\r\n");
+    }
+}

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

+package com.example.demo.tool;
+
+/**
+ * 天津猫是抽象猫的实现，我家的猫就是从天津拿来的
+ */
+public class TjCat extends CatAbstract {
+
+    @Override
+    public void jump() {
+        System.out.print("我可跳了啊\r\n");
+    }
+
+    public void kuaiban(){
+        System.out.print("我可会打快板\r\n");
+    }
+
+    @Override
+    public void run() {
+        super.run();
+    }
+}
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