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package ½ø½×;
/**
* @author The Administrator
* @version 1.0
* @created 26-10ÔÂ-2025 14:02:27
*/
class Piston {
* æ<><C3A6>è´¨
private String material;
* 冲程（毫米）
private double stroke;
public Engine m_Engine;
public Piston(){
}
public void finalize() throws Throwable {
*
* @param stroke
* @param material
public Piston(double stroke, String material){
public String getMaterial(){
return "";
public double getStroke(){
return 0;
* 活塞è¿<C3A8>动方法，引擎工作时触å<C2A6>‘
public void move(){
}//end Piston
