Java—面向对象—权限修饰符及思维导图

课上老师所讲实例整理：

package org.hanqi.pn0120;

//汽车
public class Car {

    //颜色
    private String yanse;
    //品牌
    private String pinpai;
    //油箱容量
    private double youxiangrl = 40;
    //当前油量
    private double dangqianrl;
    
    public double getDangqianrl()
    {
        return this.dangqianrl;
    }
    //加油
    public void jiayou(double youliang)
    {
        if(youliang<0)
        {
            System.out.println("不要偷油");
        }
        else if(this.dangqianrl+youliang>this.youxiangrl)
        {
            //本次加油量
            double bcyl = this.youxiangrl-this.dangqianrl;
            this.dangqianrl=this.youxiangrl;
            System.out.println("油太多了，已经加满了,这次加了"+bcyl+"升油");
        }
        else
        {
            this.dangqianrl+=youliang;
            System.out.println("这次加了 "+youliang+"升油");
        }        
    }
    //private double youhao
    private double xingshizlc = 0;
    public double getXingshizlc()
    {
        return this.xingshizlc;
    }
    //行驶
    public void xingshi(double xingshilc,double youhao)
    {
        //判断车本身有没有油
        if(this.dangqianrl <=0)
        {
            System.out.println("车没有油，怎么开车");
            return;
        }
        if(xingshilc < 0 || youhao < 0)
        {
            System.out.println("不可能这么开车");
        }
        else
        {    
        //油耗
        double dangqyh = xingshilc * youhao / 100;
        this.dangqianrl -= dangqyh;
        //验证当前油量
        //this.dangqianrl = this.dangqianrl > 0 ?this.dangqianrl : 0;
        if(this.dangqianrl<0)
        {
            this.dangqianrl=0;
            System.out.println("你是推着车走么");
        }
        this.xingshizlc += xingshilc;
        System.out.println("本次行驶了 "+xingshilc+" 公里");
        }
    }
    
    public String getYanse() {
        return yanse;
    }
    public void setYanse(String yanse) {
        this.yanse = yanse;
    }
    public String getPinpai() {
        return pinpai;
    }
    public void setPinpai(String pinpai) {
        this.pinpai = pinpai;
    }
    public double getYouxiangrl() {
        return youxiangrl;
    }
    public void setYouxiangrl(double youxiangrl) {
        this.youxiangrl = youxiangrl;
    }
    
    public void setDangqianrl(double dangqianrl) {
        this.dangqianrl = dangqianrl;
    }
    public Car(String pinpai, double youxiangrl) {
        super();
        this.pinpai = pinpai;
        this.youxiangrl = youxiangrl;
    }
    
    //main方法
    public static void main(String[]args)
    {
        Car myBenchi = new Car("奔驰",50);
        System.out.println("品牌="+myBenchi.getPinpai());
        System.out.println("油箱容量="+myBenchi.getYouxiangrl());
        myBenchi.xingshi(200, 13);
        myBenchi.jiayou(30);
        myBenchi.jiayou(30);
        System.out.println("当前容量="+myBenchi.dangqianrl);
        myBenchi.xingshi(300, 15);
        System.out.println("当前容量="+myBenchi.dangqianrl);
        System.out.println("当前总里程="+myBenchi.getXingshizlc());
        myBenchi.xingshi(200, 13);
        System.out.println("当前总里程="+myBenchi.getXingshizlc());
        System.out.println("当前容量="+myBenchi.dangqianrl);
    }    
}

运行结果为：

思维导图：