sdf/Piston.java

package com.car.model;

/**
 * 活塞类 - 引擎的组件
 * 与Engine类是组合关系
 */
public class Piston {
    private int diameter; // 直径
    private int stroke; // 冲程
    private String material; // 材质
    private int compressionRatio; // 压缩比
    
    /**
     * 构造方法
     * @param diameter 活塞直径
     * @param stroke 活塞冲程
     * @param material 材质
     * @param compressionRatio 压缩比
     */
    public Piston(int diameter, int stroke, String material, int compressionRatio) {
        this.diameter = diameter;
        this.stroke = stroke;
        this.material = material;
        this.compressionRatio = compressionRatio;
    }
    
    // getter and setter methods
    public int getDiameter() {
        return diameter;
    }
    
    public void setDiameter(int diameter) {
        this.diameter = diameter;
    }
    
    public int getStroke() {
        return stroke;
    }
    
    public void setStroke(int stroke) {
        this.stroke = stroke;
    }
    
    public String getMaterial() {
        return material;
    }
    
    public void setMaterial(String material) {
        this.material = material;
    }
    
    public int getCompressionRatio() {
        return compressionRatio;
    }
    
    public void setCompressionRatio(int compressionRatio) {
        this.compressionRatio = compressionRatio;
    }
    
    @Override
    public String toString() {
        return "Piston [diameter=" + diameter + ", stroke=" + stroke + ", material=" + material + ", compressionRatio=" + compressionRatio + "]";
    }
}