用于计算闰年的Java代码 [英] Java Code for calculating Leap Year

问题描述

我正在关注Java的艺术与科学一书，它展示了如何计算闰年。
本书使用ACM Java Task Force的库。

I am following "The Art and Science of Java" book and it shows how to calculate a leap year. The book uses ACM Java Task Force's library.

以下是图书使用的代码：

Here is the code the books uses:

import acm.program.*;

public class LeapYear extends ConsoleProgram {
    public void run()
    {

        println("This program calculates leap year.");
        int year = readInt("Enter the year: ");     

        boolean isLeapYear = ((year % 4 == 0) && (year % 100 != 0) || (year % 400 == 0));

        if (isLeapYear)
        {
            println(year + " is a leap year.");
        } else
            println(year + " is not a leap year.");
    }

}

现在，这是我计算的方式闰年。

Now, this is how I calculated the leap year.

import acm.program.*;

public class LeapYear extends ConsoleProgram {
    public void run()
    {

        println("This program calculates leap year.");
        int year = readInt("Enter the year: ");

        if ((year % 4 == 0) && year % 100 != 0)
        {
            println(year + " is a leap year.");
        }
        else if ((year % 4 == 0) && (year % 100 == 0) && (year % 400 == 0))
        {
            println(year + " is a leap year.");
        }
        else
        {
            println(year + " is not a leap year.");
        }
    }
}

我的问题是否有问题我应该使用本书提供的代码吗？

Is there anything wrong with my code or should i use the one provided by the book ?

:以上两个代码都运行正常，我想问的是哪种代码是最好的方式计算闰年。

EDIT :: Both of the above code works fine, What i want to ask is which code is the best way to calculate the leap year.

推荐答案

它们看起来和我一样，但请注意代码中的这一行有一些冗余：

They look the same to me, though note that this line in your code has some redundancy:

else if ((year % 4 == 0) && (year % 100 == 0) && (year % 400 == 0))

可以替换为：

else if (year % 400 == 0)

如果一个数字是400的倍数，那么它自动也是100和4的倍数。

If a number is a multiple of 400 then it's automatically also a multiple of 100 and 4.

编辑（7年稍后！）

请注意，如果（（年％4 == 0）&&年，上述假定存在前面的来自原始问题的％100！= 0）！

Please note that the above assumes the presence of the preceding if ((year % 4 == 0) && year % 100 != 0) from the original question!

cletus的答案应该是可接受的答案：https://stackoverflow.com/a/1021373/8331

cletus's answer should be the accepted one: https://stackoverflow.com/a/1021373/8331

（我' d删除我自己的答案，但我不能，因为它是被接受的）

(I'd delete my own answer, but I can't since it's the accepted on)

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