public? class HelloWorld{
?? ?public static void main(String[] args) {
?? ??? ?System.out.println("-----請輸入您所要查詢的車型----");
?? ??? ?System.out.println("1.寶馬 ，2.奔馳，3.奧迪");
?? ??? ?Scanner input = new Scanner(System.in);
?? ??? ?int number = input.nextInt();
?? ??? ?
?? ??? ?System.out.println("請輸入租車數量：");
?? ??? ?Scanner input2 = new Scanner(System.in);
?? ??? ?int number2 = input2.nextInt();
?? ??? ?
?? ??? ?System.out.println("請輸入租車天數：");
?? ??? ?Scanner input3 = new Scanner(System.in);
?? ??? ?int number3 = input3.nextInt();
?? ??? ?
?? ??? ?Coures bm = new bM();
?? ??? ?Coures bc = new bC();
?? ??? ?Coures ad = new aD();
?? ??? ?switch(number) {
?? ??? ?case 1:
?? ??? ??? ?bm.zC(number2,number3);
?? ??? ??? ?break;
?? ??? ?case 2:
?? ??? ??? ?bm.zC(number2,number3);
?? ??? ??? ?break;
?? ??? ?case 3:
?? ??? ??? ?bm.zC(number2,number3);
?? ??? ??? ?break;
?? ??? ?default:
?? ??? ??? ?System.out.println("對不起，輸入錯誤，請重新輸入有效信息！");
?? ??? ?}
?? ?}
}

抽象類? public abstract class Coures{
?? ?public abstract void zC(int quantity,int day);
}

寶馬類 public void zC(int quantity,int day) {
?? ??? ?float price = (quantity*500)*day;
?? ??? ?System.out.println("車型：寶馬"+'\n'+"數量："+quantity+'\n'+"天數："+day+'\n'+"單價：500"+'\n'+"總金額："+price);
?? ?}
?? ?
}

奔馳類 public class bC extends Coures {
?? ?public void zC(int quantity ,int day) {
?? ??? ?float price = (quantity*600)*day;
?? ??? ?System.out.println("車型：奔馳"+'\n'+"數量："+quantity+'\n'+"天數："+day+'\n'+"單價：600"+'\n'+'\n'+"總金額："+price);
?? ?}
}

奧迪類 public class aD extends Coures{
?? ?public void zC(int quantity,int day) {
?? ??? ?float price = (quantity*700)*day;
?? ??? ?System.out.println("車型：奧迪"+'\n'+"數量："+quantity+'\n'+"天數："+day+'\n'+"單價：700"+'\n'+"總金額："+price);
?? ?}
}