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：
  1 package org.hanqi.pn0120;
  2 
  3 //汽车
  4 public class Car {
  5 
  6     //颜色
  7     private String yanse;
  8     //品牌
  9     private String pinpai;
 10     //油箱容量
 11     private double youxiangrl = 40;
 12     //当前油量
 13     private double dangqianrl;
 14     
 15     public double getDangqianrl()
 16     {
 17         return this.dangqianrl;
 18     }
 19     //加油
 20     public void jiayou(double youliang)
 21     {
 22         if(youliang<0)
 23         {
 24             System.out.println("不要偷油");
 25         }
 26         else if(this.dangqianrl+youliang>this.youxiangrl)
 27         {
 28             //本次加油量
 29             double bcyl = this.youxiangrl-this.dangqianrl;
 30             this.dangqianrl=this.youxiangrl;
 31             System.out.println("油太多了，已经加满了,这次加了"+bcyl+"升油");
 32         }
 33         else
 34         {
 35             this.dangqianrl+=youliang;
 36             System.out.println("这次加了 "+youliang+"升油");
 37         }        
 38     }
 39     //private double youhao
 40     private double xingshizlc = 0;
 41     public double getXingshizlc()
 42     {
 43         return this.xingshizlc;
 44     }
 45     //行驶
 46     public void xingshi(double xingshilc,double youhao)
 47     {
 48         //判断车本身有没有油
 49         if(this.dangqianrl <=0)
 50         {
 51             System.out.println("车没有油，怎么开车");
 52             return;
 53         }
 54         if(xingshilc < 0 || youhao < 0)
 55         {
 56             System.out.println("不可能这么开车");
 57         }
 58         else
 59         {    
 60         //油耗
 61         double dangqyh = xingshilc * youhao / 100;
 62         this.dangqianrl -= dangqyh;
 63         //验证当前油量
 64         //this.dangqianrl = this.dangqianrl > 0 ?this.dangqianrl : 0;
 65         if(this.dangqianrl<0)
 66         {
 67             this.dangqianrl=0;
 68             System.out.println("你是推着车走么");
 69         }
 70         this.xingshizlc += xingshilc;
 71         System.out.println("本次行驶了 "+xingshilc+" 公里");
 72         }
 73     }
 74     
 75     public String getYanse() {
 76         return yanse;
 77     }
 78     public void setYanse(String yanse) {
 79         this.yanse = yanse;
 80     }
 81     public String getPinpai() {
 82         return pinpai;
 83     }
 84     public void setPinpai(String pinpai) {
 85         this.pinpai = pinpai;
 86     }
 87     public double getYouxiangrl() {
 88         return youxiangrl;
 89     }
 90     public void setYouxiangrl(double youxiangrl) {
 91         this.youxiangrl = youxiangrl;
 92     }
 93     
 94     public void setDangqianrl(double dangqianrl) {
 95         this.dangqianrl = dangqianrl;
 96     }
 97     public Car(String pinpai, double youxiangrl) {
 98         super();
 99         this.pinpai = pinpai;
100         this.youxiangrl = youxiangrl;
101     }
102     
103     //main方法
104     public static void main(String[]args)
105     {
106         Car myBenchi = new Car("奔驰",50);
107         System.out.println("品牌="+myBenchi.getPinpai());
108         System.out.println("油箱容量="+myBenchi.getYouxiangrl());
109         myBenchi.xingshi(200, 13);
110         myBenchi.jiayou(30);
111         myBenchi.jiayou(30);
112         System.out.println("当前容量="+myBenchi.dangqianrl);
113         myBenchi.xingshi(300, 15);
114         System.out.println("当前容量="+myBenchi.dangqianrl);
115         System.out.println("当前总里程="+myBenchi.getXingshizlc());
116         myBenchi.xingshi(200, 13);
117         System.out.println("当前总里程="+myBenchi.getXingshizlc());
118         System.out.println("当前容量="+myBenchi.dangqianrl);
119     }    
120 }
运行结果为：
思维导图：