Revert "Geng geng geng (#253)"

This reverts commit c374f7a.

src/main/java/com/github/hcsp/inheritance/Cat.java

@@ -1,13 +1,17 @@
 package com.github.hcsp.inheritance;
 
-public class Cat extends  Animal{
+public class Cat {
+    private String name;
 
     public Cat(String name) {
-        super(name);
+        this.name = name;
     }
 
-    public void meow() {
-        super.call("喵");
+    public void sayMyName() {
+        System.out.println("我的名字是" + name);
     }
 
+    public void meow() {
+        System.out.println("喵" + name);
+    }
 }

src/main/java/com/github/hcsp/inheritance/Dog.java

@@ -1,14 +1,17 @@
 package com.github.hcsp.inheritance;
 
-public class Dog extends Animal{
+public class Dog {
+    private String name;
 
     public Dog(String name) {
-        super(name);
+        this.name = name;
     }
 
-
+    public void sayMyName() {
+        System.out.println("我的名字是" + name);
+    }
 
     public void wang() {
-      super.call("汪");
+        System.out.println("汪" + name);
     }
 }

src/main/java/com/github/hcsp/inheritance/Rat.java

@@ -1,15 +1,17 @@
 package com.github.hcsp.inheritance;
 
-public class Rat extends Animal{
+public class Rat {
+    private String name;
 
     public Rat(String name) {
-        super(name);
+        this.name = name;
     }
 
-
+    public void sayMyName() {
+        System.out.println("我的名字是" + name);
+    }
 
     public void zhizhi() {
-        super.call("吱吱");
+        System.out.println("吱吱" + name);
     }
-
 }