租赁计费

package JFrame;
import java.util.Random;
import java.util.Scanner;
public class 租赁计费 {

        public static void main(String[] args) {
            System.out.println("租赁计费系统");
            System.out.println("请选择您要租赁的类型：\n1,轿车\t2,客车");
            Scanner in = new Scanner(System.in);
            int x =in.nextInt();
            if(x==1){
                System.out.println("请 输入您要车型:\n1,别克商务舱GL8\t费用：600(元/天)" +
                        "\n2,宝马550i\t费用：500(元/天)\n3,别克林荫大道\t费用：300(元/天)");
                int y = in.nextInt();
                System.out.println("请输入租赁天数：");
                int n= in.nextInt();
                startcar(y ,n);
            }else if(x==2){
                System.out.println("请选择您要车型：\n1,金杯 \t<=16座\t费用：800(元/天)\n2,金龙\t<=16座" +
                        "\t费用：800(元/天)\n3,金杯 \t>16座\t费用：1500(元/天)\n4,金龙\t>16座 \t费用：1500(元/天)");
                int y = in.nextInt();
                System.out.println("请输入租赁天数：");
                int n= in.nextInt();
                startbus(y ,n);
            }
        }
        static void startcar(int name,int day){
             car car=new car();
            System.out.println("租赁成功！您租赁的客车的车牌号为："+car.no+"\t颜色："+car.color+"\n需要支付金额："+car.cars(name,day)); 
            main(null);
        }
        static void startbus(int name,int day){
            bus bus=new bus();
            System.out.println("租赁成功！您租赁的客车的车牌号为："+bus.no+"\t颜色："+bus.color+"\n需要支付金额:"+bus.buss(name,day)); 
            main(null);
        }
    }

    class car extends moto{
        int GL8 =600;
        int i55i=500;
        int meni=300;
        int cars(int name,int day){
            int x=0;
            if(name==1){
                x= GL8*day;
            }else if(name==2){
                x= i55i*day;
            }else if(name==3){
                x= meni*day;
            }
            return x;
        }

    }
    class bus extends moto{
            int JB800=800;
            int JB150=1500;
            int JL800=800;
            int JL150=1500;
            int buss(int name,int day){
                int x=0;
                if(name==1){
                    x= JB800*day;
                }else if(name==2){
                    x= JL800*day;
                }else if(name==3){
                    x= JB150*day;
                }else if (name==4){
                    x= JB150*day;
                }
                return x;
            }    
    }
     class  moto{
            int no; 
            String color;
            moto(){
                no=new Random().nextInt(999999)+100000;
                color ="白色";
            }
    }