面向对象—汽车

package com.hanqi.z1p1;

public class Jidongche {

    String Number;
    int Speed;
    double Weight;
    
    int speedUp(int Speed)
    {
        this.Speed+=Speed;
        System.out.println("车牌号为"+this.Number+"现在的车速是："+this.Speed);
        return this.Speed;
    }
    
    int speedDown(int Speed)
    {
        this.Speed-=Speed;
        System.out.println("车牌号为"+this.Number+"现在的车速是："+this.Speed);
        return this.Speed;
    }
    
    String setNumber(String Number)
    {
        this.Number=Number;
        System.out.println("修改后的车牌号是："+this.Number);
        return this.Number;
    }
    
    void getWeight()
    {
        System.out.println("车牌号为"+this.Number+"的载重量为："+this.Weight);
    }
    
    Jidongche()
    {
        Number="XX1234";
        Speed=100;
        Weight=100;
    }
    
    Jidongche(String Number,int Speed,double Weight)
    {
        this.Number=Number;
        this.Speed=Speed;
        this.Weight=Weight;
    }
    
    public static void main(String[] args) {
        // TODO 自动生成的方法存根

        Jidongche j1=new Jidongche();
        System.out.println(j1.Number);
        j1.setNumber("辽A9752");
        j1.speedUp(100);
        j1.getWeight();
        
        Jidongche j2=new Jidongche("辽B5086",150,200);
        j2.speedDown(50);
        j2.speedUp(120);
        
        System.out.println("j1的所有信息："+j1.Number+" "+j1.Speed+" "+j1.Weight+" ");
        System.out.println("j2的所有信息："+j2.Number+" "+j2.Speed+" "+j2.Weight+" ");
        
        
    }

}