package liu0919;public class Jidongche {	private String number;//车牌	private int  speed;//车速	private double load;//载重	private String xinxi;	//无参	public String getNumber() {		return number;	}	public void setNumber(String number) {		this.number = number;	}	public int getSpeed() {		return speed;	}	public void setSpeed(int speed) {		this.speed = speed;	}	public double getLoad() {		return load;	}	public void setLoad(double load) {		this.load = load;	}	 public double addSpeed(int sd)	    {	        speed+=sd;	        return speed;	    }	 public int downSpeed(int sd)	    {	           speed-=sd;	           return speed;	    }	 Jidongche()	    {	       number="XX1234";	        speed=100;	        load=100;	    }	 Jidongche(String number,int  speed,double load)	 {		 this.number=number;		 this.speed=speed;		 this.load=load;	 }	//有参有返回值	void Xinxi(String n,int  s,double l)	{		xinxi=n+s+l;		System.out.println("机动车2的车牌号是："+n+"车速："+s+"载重："+l);	}	 }

package liu0919;public class Ceshi_jidongche {	public static void main(String[] args) {		Jidongche jd=new Jidongche ();		jd.setNumber("XX1234");		System.out.println("车牌号是："+jd.getNumber());				jd.setLoad(100);		System.out.println("载重是："+jd.getLoad());				jd.setSpeed(100);		System.out.println("车速是："+jd.getSpeed());		System.out.println("机动车1的车牌是："+jd.getNumber()+"载重："+jd.getLoad()+"车速："+jd.getSpeed());		//调用无参数的构造方法		jd.setNumber("辽A9752");		System.out.println("修改车牌号是："+jd.getNumber());		System.out.println("加速后为："+jd.addSpeed(20));				//有参数的				Jidongche jd2=new Jidongche ("辽B5086", 150, 200);		jd2.Xinxi("辽B5086", 150, 200);		System.out.println("减速后为："+jd2.downSpeed(20));			}}