如何找到预期日期的星期几

Question

我不知道如何找到我想要的星期几？

例如：

SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd");
Calendar calendar = Calendar.getInstance();
String s="2019-10-07";
        try {
            calendar.setTime(simpleDateFormat.parse(s));
            if(Calendar.DAY_OF_WEEK == 2){
                Toast.makeText(this, "Mo", Toast.LENGTH_SHORT).show();
            }
        } catch (ParseException e) {
            e.printStackTrace();
        }

但它不能正常工作！刚刚考虑的日历的当前日期，不是我指定的日期。

Answer 1

Calendar.DAY_OF_WEEK is a constant 7 so it's working correctly, just not how you expected. You should not be using Calendar in new code (instead use the ThreeTenABP). But calendar.get(Calendar.DAY_OF_WEEK)会给你想要的价值。

如何找到预期日期的星期几

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