ADD file via upload

Fish.java

@@ -0,0 +1,20 @@
+public class Fish extends Animal {
+    private double swimSpeed; // 特有属性：游泳速度
+    
+    public Fish(String name, int age, double swimSpeed) {
+        super(name, age);
+        this.swimSpeed = swimSpeed;
+    }
+    
+    public double getSwimSpeed() {
+        return swimSpeed;
+    }
+    
+    public void setSwimSpeed(double swimSpeed) {
+        this.swimSpeed = swimSpeed;
+    }
+    
+    // 特有方法：游�    public void swim() {
+        System.out.println(getName() + " is swimming at " + swimSpeed + " km/h.");
+    }
+}