package com.imooc; public class Che { private String carName; private int carPrice; private int carPCapacity; private int carGCapacity; public String getCarName() { return carName; } public void setCarName(String carName) { this.carName = carName; } public int getCarPrice() { return carPrice; } public void setCarPrice(int carPrice) { this.carPrice = carPrice; } public int getCarPCapacity() { return carPCapacity; } public void setCarPCapacity(int carPCapacity) { this.carPCapacity = carPCapacity; } public int getCarGCapacity() { return carGCapacity; } public void setCarGCapacity(int carGCapacity) { this.carGCapacity = carGCapacity; } }
package com.imooc; public class HuoChe extends Che { private int carPCapacity; public HuoChe(String carName, int carPrice ,int carGCapacity) { this.setCarName(carName); this.setCarPrice(carPrice); this.setCarPCapacity(); this.setCarGCapacity(carGCapacity); } public int getCarPCapacity() { return carPCapacity; } public void setCarPCapacity() { this.carPCapacity = 0; } }
package com.imooc; public class KeChe extends Che { private int carGCapacity; public KeChe(String carName, int carPrice, int carPCapacity) { this.setCarName(carName); this.setCarPrice(carPrice); this.setCarPCapacity(carPCapacity); this.setCarGCapacity(); } public int getCarGCapacity() { return carGCapacity; } public void setCarGCapacity() { this.carGCapacity = 0; } }
package com.imooc; public class PiKa extends Che { public PiKa(String carName, int carPrice, int carPCapacity, int carGCapacity) { this.setCarName(carName); this.setCarPrice(carPrice); this.setCarPCapacity(carPCapacity); this.setCarGCapacity(carGCapacity); } }
package com.imooc; import java.util.Scanner; public class Test { static KeChe k1 = new KeChe("奥迪A4", 500, 4); static KeChe k2 = new KeChe("马自达6", 400, 4); static KeChe k3 = new KeChe("金龙", 800, 20); static HuoChe h1 = new HuoChe("松花江", 400, 4); static HuoChe h2 = new HuoChe("依维柯", 1000, 20); static PiKa p1 = new PiKa("皮卡雪6", 450, 4 ,2); static Che[] ches = {null, k1, k2, k3, h1, h2, p1}; private static int totalPrice = 0; private static int totalPCapacity = 0; private static int totalGCapacity = 0; public static void main(String[] args) { Test test = new Test(); boolean boo = true; System.out.println("欢迎使用嗒嗒租车系统"); for( ; boo; ) { System.out.println("1.进入系统\n2.退出系统"); Scanner system = new Scanner(System.in); int str = system.nextInt(); if(str == 1) { System.out.println("您可租用的车辆信息如下"); System.out.println("序号\t车名\t租金(元/天)\t载人(人)\t载货(吨)"); test.printCarInfo(); System.out.println("请输入您想租用车辆的数目"); int rentNum = new Scanner(System.in).nextInt(); Che[] totalChe = new Che[rentNum + 1]; totalChe[0] = null; for(int num = 0; num < rentNum; num++) { System.out.println("请输入第 " + (num + 1) + " 辆车的序号\t"); int carNo = new Scanner(System.in).nextInt(); totalChe[(num + 1)] = ches[carNo]; totalPrice = totalPrice + ches[carNo].getCarPrice(); totalPCapacity = totalPCapacity + ches[carNo].getCarPCapacity(); totalGCapacity = totalGCapacity + ches[carNo].getCarGCapacity(); } System.out.println("请输入租用天数"); int rentDay = new Scanner(System.in).nextInt(); System.out.println("您租用的车辆信息如下"); System.out.println("序号\t车名\t租金(元/天)\t载人(人)\t载货(吨)"); for(int i = 1; i < rentNum + 1; i++) { System.out.print(i + "\t"); System.out.print(totalChe[i].getCarName() + "\t"); System.out.print(totalChe[i].getCarPrice() + "\t\t"); System.out.print(totalChe[i].getCarPCapacity() + "\t"); System.out.print(totalChe[i].getCarGCapacity() + "\t"); System.out.println(); } System.out.println("总租金为 " + totalPrice * rentDay + " 元"); System.out.println("可载人数为 " + totalPCapacity + " 人"); System.out.println("可载货物为 " + totalGCapacity + " 吨"); boo = false; } else if(str == 2){ System.out.println("很遗憾,期待您的下次使用"); boo = false; } else { System.out.println("您的输入有误,请重新输入"); } } } public void printCarInfo() { for(int i = 1; i < ches.length; i++) { System.out.print(i + "\t"); System.out.print(ches[i].getCarName() + "\t"); System.out.print(ches[i].getCarPrice() + "\t\t"); System.out.print(ches[i].getCarPCapacity() + "\t"); System.out.print(ches[i].getCarGCapacity() + "\t"); System.out.println(); } } }
test.printCarInfo(); 这是什么意思 哪里来的这方法
很好很強大
我想问一下,static Che[] ches = {null, k1, k2, k3, h1, h2, p1};数组前面的null是什么?求大神指导
漂亮。。漂亮。。。漂亮 用接口 也行吧