这段代码为什么输出不了结果？实在是找不到错误

Question

package com.xiaoyuanling;

import java.util.ArrayList;
import java.util.HashSet;
import java.util.Scanner;
import java.util.Set;

public class Method {
public Passenger[] passenger={new Passenger("1 ","奥迪A4 ","500","4"),new Passenger("2 ","马自达6 ","400","4"),new Passenger("4 ","金龙 ","800","20")};
public PickUp[] pickUp={new PickUp("3 ","皮卡雪 ","450","4","2")};
public Trunk[] trunk={new Trunk("5 ","松花江 ","400","4"),new Trunk("6 ","依维柯 ","1000","20")};
public ArrayList car1;
public ArrayList car2;
public ArrayList car3;
public Set set1;
public Set set2;
public Set set3;
public int[] sum1;
public int[] sum2;
public int[] sum3;
int sumPickUp;
int sumTrunk;
int sumPrice;

public Method(){
    car1=new ArrayList<>();
    car2=new ArrayList<>();
    car3=new ArrayList<>();
    set1=new HashSet<>();
    set2=new HashSet<>();
    set3=new HashSet<>();
    sum1=new int[3];
    sum2=new int[3];
    sum3=new int[4];
}

public void welcome(){
    String number1= "1";
    String number2= "0";

    Scanner scanner=new Scanner(System.in);
    System.out.println("欢迎来到嘀嘀打车系统!");
    System.out.println("您是否要租车:"+number1+"是"+number2+"否");
    int number3=scanner.nextInt();

    if(number3==Integer.valueOf(number1)){
        System.out.println("您可租车的类型及其价目表:");
        System.out.println("序号  "+"汽车名称 "+"租金   "+"容量");
        System.out.println(passenger[0].id+"."+"    "+passenger[0].name+"  "+passenger[0].price+"元/天"+"   "+passenger[0].pickUp+"人");
        System.out.println(passenger[1].id+"."+"    "+passenger[1].name+" "+passenger[1].price+"元/天"+"  "+passenger[1].pickUp+"人");
        System.out.println(pickUp[0].id+"."+"   "+pickUp[0].name+"  "+pickUp[0].price+"元/天"+"   "+pickUp[0].pickUp+"人"+pickUp[0].capacity+"吨");
        System.out.println(passenger[2].id+"."+"    "+passenger[2].name+"   "+passenger[2].price+"元/天"+"    "+passenger[2].pickUp+"人");
        System.out.println(trunk[0].id+"."+"    "+trunk[0].name+"  "+trunk[0].price+"元/天"+"   "+trunk[0].capacity+"吨");
        System.out.println(trunk[1].id+"."+"    "+trunk[1].name+"  "+trunk[1].price+"元/天"+"   "+trunk[1].capacity+"吨");
    }else if(number3==Integer.valueOf(number2)){
        System.out.println("欢迎下次光临,再见");
    }
}

public void rentCar(){

    System.out.println("请输入你要租车的数量:");
    Scanner input=new Scanner(System.in);
    int rentnumber=input.nextInt();

    for(int i=0;i<rentnumber;i++){
        System.out.println("请输入第"+(i+1)+"辆车的序号");
        String number1=input.next();    
        if(number1.equals(passenger[0].id)){
            car1.add(passenger[0]);
            set1.add(passenger[0]);
        }else if(number1.equals(passenger[1].id)){
            car1.add(passenger[1]);
            set1.add(passenger[1]);
        }else if(number1.equals(passenger[2].id)){
            car1.add(passenger[2]);
            set1.add(passenger[2]);
        }else if(number1.equals(pickUp[0].id)){
            car2.add(pickUp[0]);
            set2.add(pickUp[0]);
        }else if(number1.equals(trunk[0].id)){
            car3.add(trunk[0]);
            set3.add(trunk[0]);
        }else if(number1.equals(trunk[1].id)){
            car3.add(trunk[1]);
            set3.add(trunk[1]);
        }
    }

    System.out.println("请输入租车天数:");
    String number2=input.next();
    System.out.println("您的账单:");
    System.out.println("***可载人的车有");

    for(Passenger passenger1:set1){
            if(passenger1.id.equals(passenger[0].id)){
                System.out.print("奥迪A4");
            }else if(passenger1.id.equals(passenger[1].id)){
                System.out.print("马自达6");
            }else if(passenger1.id.equals(passenger[2].id)){
                System.out.print("金龙");
            }
    }
    for(PickUp pickUp1:set2){
        if(pickUp1.id.equals(pickUp[0].id)){
            System.out.print("皮卡雪");
        }
    }

    for(Passenger passenger2:car1){
        sum1[0] += Integer.parseInt(passenger2.pickUp);
    }

    for(PickUp pickUp2:car2){
        sum1[1] += Integer.parseInt(pickUp2.pickUp);
    }

    sum1[2]=sum1[0]+sum1[1];

    System.out.println("共载人:" + sum1[2]);
    System.out.println("***载货的车有:");

    for(PickUp pickUp3:set2){
        if(pickUp3.id.equals(pickUp[0].id)){
            System.out.print("皮卡雪");
        }
    }

    for(Trunk trunk1:set3){
        if(trunk1.id.equals(passenger[1].id)){
                System.out.print("松花江");
        }else if(trunk1.id.equals(passenger[2].id)){
                System.out.print("依维柯");
        }
    }

    for(PickUp pickUp4:car2){
        sum2[0] += Integer.parseInt(pickUp4.capacity);
    }

    for(Trunk trunk3:car3){
        sum2[1] += Integer.parseInt(trunk3.capacity);
    }

    sum2[2]=sum2[0]+sum2[1];

    System.out.println("共载货:"+sum2[2]);   
    System.out.println("***租车总价格:");

    for(Passenger passenger3:set1){
        sumPrice += ((Integer.parseInt(passenger3.price))*Integer.parseInt(number2));
        sum3[0]=sumPrice;
    }

    for(PickUp pickUp4:set2){
        sumPrice += ((Integer.parseInt(pickUp4.price))*Integer.parseInt(number2));
        sum3[1]=sumPrice;
    }

    for(Trunk trunk4:set3){
        sumPrice += ((Integer.parseInt(trunk4.price))*Integer.parseInt(number2));
        sum3[2]=sumPrice;
    }

    sum3[3]=sum3[0]+sum3[1]+sum3[2];

    System.out.print(sum3[3]);
}

}