35.综合练习：买飞机票

//机票价格按照淡季旺季，头等舱经济舱收费
//键盘录入机票原价、月份和仓位
//旺季（5月到10月）：头等舱9折，经济舱8.5折
//淡季（11月到下一年的4月）：头等舱7折，经济舱6.5折

import java.util.Scanner;

public class 飞机票 {
 
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入机票原价：");
        int price = sc.nextInt();
        System.out.println("请输入月份：");
        int month = sc.nextInt();
        System.out.println("请输入仓位（1-头等舱  2-经济舱）：");
        int seat = sc.nextInt();
        if (month >= 5 && month <= 10) {
            if (seat==1){
                price=(int)(price*0.9);
            }
            else if (seat==2){
                price=(int)(price*0.85);
            }
            else{
                System.out.println("请正确输入仓位所代表的数字！");
            }
        }else if ((month>=1&&month<=4)||(month>=11&&month<=12)){
            if (seat==1){
                price=(int)(price*0.7);
            }
            else if (seat==2){
                price=(int)(price*0.65);
            }
            else{
                System.out.println("请正确输入仓位所代表的数字！");
            }
        }
        else{
            System.out.println("请正确输入月份！");
        }
        System.out.println("最终票价为："+price);
    }
}

由于if-else判断语句重复较多，所以采用定义方法来优化代码

优化后代码如下：

import java.util.Scanner;

public class 飞机票 {
   
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入机票原价：");
        int price = sc.nextInt();
        System.out.println("请输入月份：");
        int month = sc.nextInt();
        System.out.println("请输入仓位（1-头等舱  2-经济舱）：");
        int seat = sc.nextInt();
        if (month >= 5 && month <= 10) {
            price = getPrice(price, seat, 0.9, 0.85);
        } else if ((month >= 1 && month <= 4) || (month >= 11 && month <= 12)) {
            price = getPrice(price, seat, 0.7, 0.65);
        } else {
            System.out.println("请正确输入月份！");
        }
        System.out.println("最终票价为：" + price);
    }

    public static int getPrice(int price, int seat, double a, double b) {
        if (seat == 1) {
            price = (int) (price * a);
        } else if (seat == 2) {
            price = (int) (price * b);
        } else {
            System.out.println("请正确输入仓位所代表的数字！");
        }
        return price;
    }
}