From d73df0a19f9f342698014ffa2dd3cca5341b6d1b Mon Sep 17 00:00:00 2001
From: Zhuhuairui <3180158655@qq.com>
Date: Thu, 16 Apr 2026 11:30:08 +0800
Subject: [PATCH] =?UTF-8?q?=E4=B8=8A=E4=BC=A0=E6=96=87=E4=BB=B6=E8=87=B3?=
 =?UTF-8?q?=20'w7'?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 w7/Main.java | 59 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 59 insertions(+)
 create mode 100644 w7/Main.java

diff --git a/w7/Main.java b/w7/Main.java
new file mode 100644
index 0000000..b40e638
--- /dev/null
+++ b/w7/Main.java
@@ -0,0 +1,59 @@
+// 1. 抽象类 Animal（顶级类，不嵌套在Main里）
+abstract class Animal {
+    public abstract void makeSound();
+}
+
+// 2. 接口 Swimmable（顶级类）
+interface Swimmable {
+    void swim();
+}
+
+// 3. Dog 类（顶级类，继承Animal + 实现Swimmable）
+class Dog extends Animal implements Swimmable {
+    @Override
+    public void makeSound() {
+        System.out.println("狗叫：汪汪汪！");
+    }
+
+    @Override
+    public void swim() {
+        System.out.println("狗会游泳：狗刨式前进！");
+    }
+}
+
+// 4. Cat 类（顶级类，仅继承Animal）
+class Cat extends Animal {
+    @Override
+    public void makeSound() {
+        System.out.println("猫叫：喵喵喵！");
+    }
+}
+
+// 5. 主类 Main（唯一public类，包含标准main方法）
+public class Main {
+    // ✅ 正确的main方法：public static + String[]参数
+    public static void main(String[] args) {
+        // 测试多态调用
+        System.out.println("=== 多态测试：动物叫声 ===");
+        Animal dog = new Dog();
+        Animal cat = new Cat();
+        dog.makeSound();
+        cat.makeSound();
+
+        System.out.println("\n=== 接口测试：游泳能力 ===");
+        Swimmable swimmer = new Dog();
+        swimmer.swim();
+
+        System.out.println("\n=== 综合遍历测试 ===");
+        Animal[] animals = {new Dog(), new Cat()};
+        for (Animal animal : animals) {
+            animal.makeSound();
+            // 判断是否实现了Swimmable接口
+            if (animal instanceof Swimmable) {
+                ((Swimmable) animal).swim();
+            } else {
+                System.out.println("该动物不会游泳");
+            }
+        }
+    }
+}
\ No newline at end of file