最弱的哒哒系统，只有运人的功能，请大家指导

package Sbzuce;

public abstract  class car{

public int a[][];

public String d[][]; 

}//其实，不需要抽象类来着，但是，要是不写，太少了

package Sbzuce;

import java.util.*;

public class fengmian extends car{

public static void main(String[] args) {

int[][] a= {{10,200},{10,300},{20,300}};

String[]d= {"小车a","小车b","大车"};

Scanner scan = new Scanner(System.in);

System.out.println("你是否要租车？"+"\n1、是\n"+"2、否");

int A=scan.nextInt();

if(A==1) {

System.out.print("id"+"\t"+"车名"+"\t"+"载客量（人）"+"价格（元）");

for(int i=0;i<3;i++) {

int m=i+1;

System.out.print("\n"+m+"\t"+d[i]+"\t");

for (int j=0;j<2;j++) {

System.out.print(a[i][j]+"\t"+"\t");}

}

int B =scan.nextInt();

System.out.println("请输入数量");

int C =scan.nextInt();

for(int i=0;i<3;i++)

{

if(B==i+1) {

    int c1=C*a[i][1];

    int c2=C*a[i][1];

System.out.println("名称为:"+d[i]+"\t"+"载人为："+c2+"价格:"+c1);

}

}

}

else{System.out.print("babai");

}

}}