update:demo2

com/study/demo2/Animal.java

@@ -0,0 +1,44 @@
+package com.study.demo2;
+
+public abstract class Animal {
+    protected String name;
+
+    public Animal(String name) {
+        this.name = name;
+    }
+
+    public abstract void makeSound();
+    public abstract void move();
+}
+
+class Dog extends Animal {
+    public Dog(String name) {
+        super(name);
+    }
+
+    @Override
+    public void makeSound() {
+        System.out.println(name + " 汪汪叫");
+    }
+
+    @Override
+    public void move() {
+        System.out.println(name + " 跑动");
+    }
+}
+
+class Bird extends Animal {
+    public Bird(String name) {
+        super(name);
+    }
+
+    @Override
+    public void makeSound() {
+        System.out.println(name + " 叽叽喳喳");
+    }
+
+    @Override
+    public void move() {
+        System.out.println(name + " 飞翔");
+    }
+}