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：