Car/Wheel.java

package com.automobile.parts;

/**
 * 车轮类 - 与汽车是组合关系
 * 车轮是汽车的必要组成部分，不能独立于汽车存在
 */
public class Wheel {
    private double diameter;
    private double width;
    private String brand;
    private double pressure;
    private boolean isMoving;
    
    /**
     * 构造方法 - 创建车轮时设置默认属性
     */
    public Wheel() {
        this.diameter = 17.0; // 英寸
        this.width = 225.0;   // 毫米
        this.brand = "米其林";  
        this.pressure = 2.5;  // 巴
        this.isMoving = false;
    }
    
    /**
     * 开始转动
     */
    public void startMoving() {
        this.isMoving = true;
        System.out.println("车轮开始转动");
    }
    
    /**
     * 停止转动
     */
    public void stopMoving() {
        this.isMoving = false;
        System.out.println("车轮停止转动");
    }
    
    /**
     * 调整胎压
     * @param newPressure 新的胎压值
     */
    public void adjustPressure(double newPressure) {
        if (newPressure >= 1.5 && newPressure <= 3.5) {
            this.pressure = newPressure;
            System.out.println("胎压调整到 " + newPressure + " 巴");
        } else {
            System.out.println("无效的胎压值");
        }
    }
    
    /**
     * 检查轮胎状态
     */
    public void checkStatus() {
        System.out.println("轮胎状态: 品牌=" + brand + ", 尺寸=" + diameter + "x" + width + ", 胎压=" + pressure + "巴, " + 
                          (isMoving ? "转动中" : "静止"));
    }
    
    // Getter 和 Setter 方法
    public double getDiameter() {
        return diameter;
    }
    
    public void setDiameter(double diameter) {
        this.diameter = diameter;
    }
    
    public double getWidth() {
        return width;
    }
    
    public void setWidth(double width) {
        this.width = width;
    }
    
    public String getBrand() {
        return brand;
    }
    
    public void setBrand(String brand) {
        this.brand = brand;
    }
    
    public double getPressure() {
        return pressure;
    }
    
    public boolean isMoving() {
        return isMoving;
    }
}