java9

小练习：

public class test1 {
    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);
        System.out.println("请输入当前机票的原价");
        int ticket = sc.nextInt();
        System.out.println("请输入月份");
        int month = sc.nextInt();
        System.out.println("请输入当前购买的舱位 0 头等舱 1经济舱");
        int seat = sc.nextInt();

        if (month >= 5 && month <= 10){
            ticket = getPrice(ticket,seat,0.9,0.85);
        } else if ((month >= 1 && month <= 4) || (month >= 11 && month <= 12)) {
            ticket = getPrice(ticket,seat,0.7,0.65);
        }else {
            System.out.println("键盘录入的数据不合法");
        }
        System.out.println(ticket);
    }
    public static int getPrice(int ticket,int seat,double v0, double v1){
        if (seat == 0){
            ticket = (int) (ticket * v0);
        }else {
            ticket = (int) (ticket*v1);
        }
        return ticket;
    }
}
条件if语句，用方法包装。