求助求助，好多好多都不会！
package com.imooc.dada;
import java.util.Scanner;
public class Auto {
public class AudiA4{
public void AudiA4(){
final int price1=500;
int capacity=4;
System.out.println("1 奥迪A4 租金："+price1+"/天 载客量："+capacity+"人");
}
}
public class Mazda6{
public void Mazda6(){
int price2=400;
int capacity=4;
System.out.println("2 马自达6 租金："+price2+"/天 载客量："+capacity+"人");
}
}
public class Pickup_Snow6{
public void Pickup_Snow6(){
int price3=450;
int capacity=4;
int cargo_capacity=2;
System.out.println("3 皮卡雪6 租金："+price3+"/天 载客量："+capacity+"人"+" 载货"+cargo_capacity+"吨");
}
}
public class GoldenDragon{
public void GoldenDragon(){
int price4=800;
int capacity=20;
System.out.println("4 金龙 租金："+price4+"/天 载客量："+capacity+"人");
}
}
public class Shj{
public void Shj(){
int price5=400;
int cargo_capacity=4;
System.out.println("5 松花江 租金："+price5+"/天 载货："+cargo_capacity);
}
}
public class Iveco{
public void Iveco(){
int price6=1000;
int cargo_capacity=20;
System.out.println("6 依维柯 租金："+price6+"/天 载货："+cargo_capacity);
}
}
public int price2(int xuhao){
int[] price2={500,400,450,800,400,1000};
return price2[xuhao];
}
public int xuhao2(int xuhao){
int[] xuhao2={1,2,3,4,5,6};
return xuhao2[xuhao];
}
public static void main(String[] args){
Auto n=new Auto();
AudiA4 a=n.new AudiA4();
Mazda6 b=n.new Mazda6();
Pickup_Snow6 c=n.new Pickup_Snow6();
GoldenDragon d=n.new GoldenDragon();
Shj e=n.new Shj();
Iveco f=n.new Iveco();
System.out.println("欢迎使用达达租车系统：");
System.out.println("您是否要租车：1是，0否");
Scanner input=new Scanner(System.in);
int confirm=input.nextInt();
if(confirm==1){
System.out.println("您可租的车型及价目表：");
System.out.println("序号 汽车名称 租金 容量");
a.AudiA4();
b.Mazda6();
c.Pickup_Snow6();
d.GoldenDragon();
e.Shj();
f.Iveco();
System.out.println("请输入您要租汽车的数量：");
int shuliang=input.nextInt();
for(int i=1;i<=shuliang;i++){
System.out.println("请输入第"+i+"辆车的序号：");
}
int xuhao=input.nextInt();
n.xuhao2(xuhao);
System.out.println("请输入租车天数：");
int daynum=input.nextInt();
System.out.println("您的账单："+n.price2(n.xuhao2(xuhao))*daynum);
System.out.println("***可载人的车有：");
System.out.println("***载货的车有：");
System.out.print("***租车总价格为：");
}
}
}
