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javastringboolean
模拟实现电风扇，可以调 3 档速度（慢速、中速、快速）；开关按钮；定时吹风；描述
风扇的扇叶大小、颜色等。
设计Fan 类，属性包括：3 个常量 SLOW （1）、MEDIUM（2）、FA ST（3）代表风扇的
速度；1 个int 属性speed 指定速度，默认值为 SLOW ；1 个boolean属性 on 指定开关机，默
认值false ；1 个double 属性 radius 指定风扇扇叶大小；1 个String 属性 color指定扇叶颜色，
默认值为 blue 。方法包括这些属性的访问器、构造函数、重写 Object 类的 toString() 和equals()

 public class Fan {

    public Fan() {}

    public static final int SLOW = 1;

    public static final int MEDIUM = 2;

    public static final int FA = 3;

    public int speed = SLOW;

    public boolean on = false;

    public double radius = 0.0d;

    public String color = "blue";

    public int getSpeed() {
        return speed;
    }

    public void setSpeed(int speed) {
        this.speed = speed;
    }

    public boolean isOn() {
        return on;
    }

    public void setOn(boolean on) {
        this.on = on;
    }

    public double getRadius() {
        return radius;
    }

    public void setRadius(double radius) {
        this.radius = radius;
    }

    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + ((color == null) ? 0 : color.hashCode());
        result = prime * result + (on ? 1231 : 1237);
        long temp;
        temp = Double.doubleToLongBits(radius);
        result = prime * result + (int) (temp ^ (temp >>> 32));
        result = prime * result + speed;
        return result;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (obj == null)
            return false;
        if (getClass() != obj.getClass())
            return false;
        Fan other = (Fan) obj;
        if (color == null) {
            if (other.color != null)
                return false;
        } else if (!color.equals(other.color))
            return false;
        if (on != other.on)
            return false;
        if (Double.doubleToLongBits(radius) != Double
                .doubleToLongBits(other.radius))
            return false;
        if (speed != other.speed)
            return false;
        return true;
    }

    @Override
    public String toString() {
        return "Fan [speed=" + speed + ", on=" + on + ", radius=" + radius
                + ", color=" + color + "]";
    }
}