将公用代码抽取到不同层级的父类中

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

@@ -0,0 +1,22 @@
+package com.github.hcsp.inheritance;
+
+public class Animal {
+    private String name;
+
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public Animal(String name) {
+        this.name = name;
+    }
+
+    public void sayMyName() {
+        System.out.println("我的名字是" + name);
+    }
+}

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

@@ -1,21 +1,13 @@
 package com.github.hcsp.inheritance;
 
-public class Boy {
-    private String name;
-    private int age;
+public class Boy extends Child{
+
 
     public Boy(String name, int age) {
-        this.name = name;
-        this.age = age;
+       super(name,age);
     }
 
-    public void sayMyName() {
-        System.out.println("我的名字是" + name);
-    }
 
-    public void sayMyAge() {
-        System.out.println("我的年龄是" + age);
-    }
 
     public void sayBoy() {
         System.out.println("我是一个男孩");

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() {
+         public void meow() {
         System.out.println("喵");
     }
 }

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

@@ -0,0 +1,39 @@
+package com.github.hcsp.inheritance;
+
+public class Child {
+    private String name;
+    private int age;
+
+    public Child(String name,int age) {
+        this.age = age;
+        this.name = name;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public int getAge() {
+        return age;
+    }
+
+    public void setAge(int age) {
+        this.age = age;
+    }
+
+
+
+    public void sayMyName() {
+        System.out.println("我的名字是" + name);
+    }
+
+    public void sayMyAge() {
+        System.out.println("我的年龄是" + age);
+    }
+
+
+}

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

@@ -1,15 +1,11 @@
 package com.github.hcsp.inheritance;
 
-public class Dog {
+public class Dog extends Animal{
     private String name;
-
     public Dog(String name) {
-        this.name = name;
+        super(name);
     }
 
-    public void sayMyName() {
-        System.out.println("我的名字是" + name);
-    }
 
     public void wang() {
         System.out.println("汪");

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

@@ -1,21 +1,12 @@
 package com.github.hcsp.inheritance;
 
-public class Girl {
-    private String name;
-    private int age;
+public class Girl extends Child{
 
     public Girl(String name, int age) {
-        this.name = name;
-        this.age = age;
+        super(name,age);
     }
 
-    public void sayMyName() {
-        System.out.println("我的名字是" + name);
-    }
 
-    public void sayMyAge() {
-        System.out.println("我的年龄是" + age);
-    }
 
     public void sayGirl() {
         System.out.println("我是一个女孩");