如何创建一个循环来显示每个月的月份和日期？

Question

public class Array {

    public static void main(String args[]) {
        String[] months = { "January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December" };
        int[] daysInMonth = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
        System.out.println("There are a total of " + daysInMonth[0] + " days in the month of " + months[0] + ".");
    }

}

我不是每个月打印到控制台 12 次不同的时间，而是如何提高我的代码效率并创建一个循环来打印出数组中的每个元素？

Answer 1

尝试以下操作：

for (int i = 0; i < 12; i++) {
    System.out.println("There are a total of " + daysInMonth[i] + " days in the month of " + months[i] + ".");
}

Answer 2

answer by semicolon 是正确的，您应该接受。我写这个答案是为了向您介绍java.time API。

import java.time.Month;
import java.time.format.TextStyle;
import java.util.Locale;

public class Main {
    public static void main(String[] args) {
        for (int i = 1; i <= 12; i++) {
            Month month = Month.of(i);
            System.out.println(month.getDisplayName(TextStyle.FULL, Locale.ENGLISH) + " has a maximum of "
                    + month.maxLength() + " days.");
        }
    }
}

输出：

January has a maximum of 31 days.
February has a maximum of 29 days.
March has a maximum of 31 days.
...

ONLINE DEMO

通过 Trail: Date Time 了解有关 modern Date-Time API^* 的更多信息。

Answer 3

你可以创建一个 Map 然后遍历它。

final Map<String, Integer> months = new HashMap<>();
months.put("January", 31);
months.put("February", 28);
...
months.forEach((k, v) -> System.out.println("There are a total of " + v + " days in the month of " + k + "."));