想要将星期几作为字符串，但是给错一天 [英] Want to get day of a week as a string, But giving wrong day

问题描述

我尝试通过使用以下代码将日期作为字符串。但是它返回错误的字符串。

I tried to get the day as a string by using the following code. But it returns wrong string. Can I fix it with this code.

private String getDayOfWeek(int value){
    String day = "";
    switch(value){
    case 1:
        day="Sunday";
        break;
    case 2:
        day="Monday";
        break;
    case 3:
        day="Tuesday";
        break;
    case 4:
        day="Wednesday";
        break;
    case 5:
        day="Thursday";
        break;
    case 6:
        day="Friday";
        break;
    case 7:
        day="Saturday";
        break;
    }
    return day;

我将其实现为

Calendar c = Calendar.getInstance();    
String dayOfWeek = getDayOfWeek(Calendar.DAY_OF_WEEK);
System.out.println(dayOfWeek);

推荐答案

您需要使用

String dayOfWeek = getDayOfWeek(c.get(Calendar.DAY_OF_WEEK));

您之前在做什么

String dayOfWeek = getDayOfWeek(Calendar.DAY_OF_WEEK);

正在使用随机常量（恰好是7 ）日历类用于表示日期中的 DAY_OF_WEEK 字段。

is calling your method with a random constant (that happens to be 7) the Calendar class is using to represent the DAY_OF_WEEK field in a date.

您真正要查找的是在您的 Calendar 实例中获取星期几的值，这就是 Calendar＃get（int）

What you are actually looking for is getting the value of the day of the week in your Calendar instance, which is what Calendar#get(int)

c.get(Calendar.DAY_OF_WEEK)

返回。

在相关注释，请尝试学习和使用注释中所述的实际调试器。

On a related note, try to learn and use an actual debugger as stated in the comments.

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