Java日历的setMonth方法是否有错误？ [英] Does the setMonth method of Java Calendar work wrong?

问题描述

我有小代码，如下所示。我预计结果应该是 7 ，但它打印 6 。如果我取消注释行 tmp.get（Calendar.MONTH），它运行OK（打印 7 ）。

I have small code such as below. I expected that the result should be 7, but it printed 6. If I uncomment the line tmp.get(Calendar.MONTH), it runs OK (prints 7).

请让我知道原因。我在MacOS中使用JDK 1.7.0_25。

Please let me know the reason. I'm using JDK 1.7.0_25 in MacOS.

public static void main(String[] args) {
    Calendar tmp = Calendar.getInstance();
    tmp.set(Calendar.DAY_OF_MONTH, 4);
    tmp.set(Calendar.MONTH, Calendar.AUGUST);
    //tmp.get(Calendar.MONTH);
    tmp.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);
    System.out.println(tmp.get(Calendar.MONTH));
}

屏幕截图：

注释代码： http://gyazo.com/4c099b1b2b90d72d1954b98b134e4ac3

取消注释代码： http://gyazo.com/fe368745da168646140ca9f3a60d2021

推荐答案

因为月份索引从索引0开始。在获取月份时添加+1。它是基于c的结构复制到java中。它的索引为0到11.

Because month index starts with index 0. add +1 while get month. it is c based structure copied into java. It has indexes 0 to 11.

我认为每月的日期不正确。评论并运行它正确显示（ tmp.set（Calendar.DAY_OF_WEEK，Calendar.MONDAY）; ）

And i think day of month is incorrect. comment that and run it it shows correctly.(tmp.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);)

    tmp.set(Calendar.DAY_OF_MONTH, 4);
    tmp.set(Calendar.MONTH, Calendar.AUGUST);
    //tmp.get(Calendar.MONTH);
    //tmp.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);
    System.out.println(tmp.get(Calendar.MONTH));

默认情况下，2015年为年，8月4日为 tuesday 不 monday

By default it takes year as 2015 and August 4 is tuesday not monday

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