感覺寫了好多代碼，很多地方都可以優(yōu)化，但是我剛學(xué)，不知道怎么修改， 希望各位可以提供點(diǎn)思路，感謝！以下是代碼：

//父類：
package?Dada;

public?abstract?class?Vehicle?{

????public?int?price;
????public?int?people;
????public?String?name;
????public?double?load;
????abstract?void?info();

}

子類：奧迪

package?Dada;

public?class?Audi?extends?Vehicle?{
????public?final?int?price?=?500;
????public?final?int?people?=?4;
????public?final?int?id?=1;
????public?final?String?name?=?"奧迪A4";
????@Override
????void?info()?{
????????System.out.println(id+"."+"?"+name+"?"+price+"/天"+"?"+"載人:"+people+"人");
????}
}

子類：馬自達(dá)

package?Dada;

public?class?Mazda?extends?Vehicle?{
????public?final?int?price?=?400;
????public?final?int?people?=?4;
????public?final?int?id?=2;
????public?final?String?name?=?"馬自達(dá)6";
????@Override
????void?info()?{
????????System.out.println(id+"."+"?"+name+"?"+price+"/天"+"?"+"載人:"+people+"人");
????}
}

子類：皮卡雪6

package?Dada;

public?class?Pika?extends?Vehicle?{
????public?final?int?price?=?450;
????public?final?int?people?=?4;
????public?final?int?id?=3;
????public?final?String?name?=?"皮卡雪6";
????public?final?double?load?=?2;
????@Override
????void?info()?{
????????System.out.println(id+"."+"?"+name+"?"+price+"/天"+"?"+"載人:"+people+"人"+"載貨"+load+"噸");
????}
}

子類：金龍

package?Dada;

public?class?Jinlong?extends?Vehicle?{
????public?final?int?price?=?800;
????public?final?int?people?=?20;
????public?final?int?id?=4;
????public?final?String?name?=?"金龍";
????@Override
????void?info()?{
????????System.out.println(id+"."+"?"+name+"?"+price+"/天"+"?"+"載人:"+people+"人");
????}
}

子類：松花江

package?Dada;

public?class?Songhuajiang?extends?Vehicle?{
????public?final?int?price?=?400;
????public?final?double?load?=?4;
????public?final?int?id?=5;
????public?final?String?name?=?"松花江";
????@Override
????void?info()?{
????????System.out.println(id+"."+"?"+name+"?"+price+"/天"+"?"+"載貨:"+load+"噸");
????}
}

子類：依維柯

package?Dada;

public?class?Yiweike?extends?Vehicle?{
????public?final?int?price?=?1000;
????public?final?double?load?=?20;
????public?final?int?id?=6;
????public?final?String?name?=?"依維柯";
????@Override
????void?info()?{
????????System.out.println(id+"."+"?"+name+"?"+price+"/天"+"?"+"載貨:"+load+"噸");
????}
}

測試類：

package?Dada;

import?java.util.ArrayList;
import?java.util.List;
import?java.util.Scanner;

public?class?test?{


????public?static?void?main(String[]?args){

????????List<Integer>?data;
????????List<String>?passengerVehicleName=new?ArrayList<>();
????????List<String>?goodsVehicleName=new?ArrayList<>();
????????System.out.println("歡迎使用答答租車系統(tǒng)：");
????????System.out.println("您是否要租車？?1?是，?0?否");
????????Scanner?select?=?new?Scanner(System.in);
????????int?answer?=?select.nextInt();
????????int?dayNum;
????????int?money?=0;
????????int?people=0;
????????double?goods?=0;

????????switch?(answer){
????????????case?1:
????????????????info();
????????????????break;
????????????case?0:
????????????????System.out.println("不租車你點(diǎn)進(jìn)來干嘛，別鬧！");
????????????????break;
????????????default:
????????????????System.out.println("你好調(diào)皮，再見。");

????????}

????????data?=?rentNumber();
????????dayNum?=?data.get(data.size()-1);
????????data.remove(data.size()-1);

????????for?(int?i:?data){
????????????switch?(i){
????????????????case?1:
????????????????????Audi??audi?=?new?Audi();
????????????????????money=?money+audi.price*dayNum;
????????????????????people=?people+audi.people;
????????????????????passengerVehicleName.add(audi.name);
????????????????????break;
????????????????case?2:
????????????????????Mazda?mazda?=?new?Mazda();
????????????????????money?=?money+mazda.price*dayNum;
????????????????????people?=?people+mazda.people;
????????????????????passengerVehicleName.add(mazda.name);
????????????????????break;
????????????????case?3:
????????????????????Pika?piKa?=?new?Pika();
????????????????????money=money+piKa.price*dayNum;
????????????????????people=people+piKa.people;
????????????????????goods=goods+piKa.load;
????????????????????passengerVehicleName.add(piKa.name);
????????????????????goodsVehicleName.add(piKa.name);
????????????????????break;
????????????????case?4:
????????????????????Jinlong?jinLong?=?new?Jinlong();
????????????????????money?=?money?+?jinLong.price*dayNum;
????????????????????people?=?people+jinLong.people;
????????????????????passengerVehicleName.add(jinLong.name);
????????????????????break;
????????????????case?5:
????????????????????Songhuajiang?songHuaJiang?=?new?Songhuajiang();
????????????????????money?=?money+songHuaJiang.price*dayNum;
????????????????????goods?=?goods+songHuaJiang.load;
????????????????????goodsVehicleName.add(songHuaJiang.name);
????????????????????break;
????????????????case?6:
????????????????????Yiweike?yiWeiKe?=?new?Yiweike();
????????????????????money?=?money?+?yiWeiKe.price*dayNum;
????????????????????goods?=?goods?+?yiWeiKe.load;
????????????????????goodsVehicleName.add(yiWeiKe.name);
????????????????????break;
????????????}
????????}

????????System.out.println("您的賬單：");
????????if?(people!=0){
????????????System.out.println("***可載人的車有:");
????????????for?(String?i:passengerVehicleName
????????????)?{
????????????????System.out.print(i+"?");
????????????}
????????????System.out.println("共載人："+people+"人");
????????????System.out.println();
????????}

????????if?(goods!=0){
????????????System.out.println("***可載貨的車有:");
????????????for?(String?i:goodsVehicleName
????????????)?{
????????????????System.out.print(i+"?");
????????????}
????????????System.out.println("共載貨："+goods+"噸");
????????????System.out.println();
????????}

????????System.out.println("***租車總價格為"+money+"元");
????}

????static?void?info(){
????????System.out.println("您可租車的類型及價目表如下：");
????????System.out.println("序號?汽車名稱?租金???容量");
????????Vehicle?Audi?=?new?Audi();
????????Audi.info();
????????Vehicle?Mazda?=?new?Mazda();
????????Mazda.info();
????????Vehicle?Pika?=?new?Pika();
????????Pika.info();
????????Vehicle?Jinlong?=?new?Jinlong();
????????Jinlong.info();
????????Vehicle?Songhuajiang?=?new?Songhuajiang();
????????Songhuajiang.info();
????????Vehicle?Yiweike?=?new?Yiweike();
????????Yiweike.info();
????}

????public?static?List?rentNumber(){
????????List<Integer>?selection?=?new?ArrayList<>();
????????System.out.println("請輸入您要租車的數(shù)量：");
????????Scanner?rn?=?new?Scanner(System.in);
????????int?number?=?rn.nextInt();

????????for?(int?i?=?1;?i<=?number;?i++){
????????????System.out.println("請輸入第"+i+"輛車的序號：");
????????????Scanner?num?=?new?Scanner(System.in);
????????????int?a?=?num.nextInt();
????????????selection.add(a);
????????}
????????System.out.println("請輸入租車天數(shù)：");
????????Scanner?data?=?new?Scanner(System.in);
????????int?dayNum?=?data.nextInt();
????????selection.add(dayNum);
????????return?selection;
????}
}