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.");
    }
}