创建一个Animal类

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

@@ -0,0 +1,20 @@
+package com.github.hcsp.inheritance;
+
+public class Animal {
+    //声明一个存储名字的字符串变量
+    private String name;
+
+    //修改名字的方法
+    public Animal(String name) {
+        this.name = name;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void sayMyName() {
+        System.out.println("我的名字是" + name);
+    }
+
+}

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

@@ -1,17 +1,11 @@
 package com.github.hcsp.inheritance;
 
-public class Cat {
-    private String name;
-
+public class Cat extends Animal {
     public Cat(String name) {
-        this.name = name;
-    }
-
-    public void sayMyName() {
-        System.out.println("我的名字是" + name);
+        super(name);
     }
 
     public void meow() {
-        System.out.println("喵" + name);
+        System.out.println("喵" + super.getName());
     }
 }

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

@@ -1,17 +1,12 @@
 package com.github.hcsp.inheritance;
 
-public class Dog {
-    private String name;
+public class Dog extends Animal {
 
     public Dog(String name) {
-        this.name = name;
-    }
-
-    public void sayMyName() {
-        System.out.println("我的名字是" + name);
+        super(name);
     }
 
     public void wang() {
-        System.out.println("汪" + name);
+        System.out.println("汪" + super.getName());
     }
 }

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

@@ -1,17 +1,12 @@
 package com.github.hcsp.inheritance;
 
-public class Rat {
-    private String name;
+public class Rat extends Animal {
 
     public Rat(String name) {
-        this.name = name;
-    }
-
-    public void sayMyName() {
-        System.out.println("我的名字是" + name);
+        super(name);
     }
 
     public void zhizhi() {
-        System.out.println("吱吱" + name);
+        System.out.println("吱吱" + super.getName());
     }
 }