Question

我在java的开头章节，本章介绍if和else语句和开关。我无法像星期日，星期一那样打印今天和未来的日子，而是显示像0,1这样的数字。当我使用if和else语句以供将来约会时，我今天不能改变它，反之亦然。我现在已经做到了这一点。

import java.util.Scanner;

public class Exercise03_05
{
 public static void main (String[] args)
 {
  Scanner input = new Scanner (System.in);

  System.out.print ("Enter today's day: ");
  int dayNumber = input.nextInt();

  System.out.print ("Enter the number of days elapsed since today: ");
  int daysElapsed = input.nextInt();

// Giving initial value to futureDay
  int futureDay = 0;

  if (daysElapsed < 7)
  futureDay = daysElapsed;
  else 
  futureDay = daysElapsed / 7;

  System.out.println ("Today is " + dayNumber + " and the future day is " + futureDay);
 }
}

Answer 1

使用年，月和日构建GregorianCalendar，然后查询它以查找当天的名称。像这样：

    String days[] ={"Thursday","Friday","Saturday","Sunday","Monday","Tuesday","Wednesday"};
    int year = 2014;
    int month = 6;
    int dayOfMonth = 25;
    Calendar myCalendar = new GregorianCalendar(year, month, dayOfMonth);
    System.out.print(days[myCalendar.get(Calendar.DAY_OF_WEEK)]);

Answer 2

最简单的基本方法是使用日期名称定义一个字符串数组，并使用您已有的索引调用它们：

String days[] ={"Monday","Tuesday","Wednesday","Thursday","Friday","Saturday","Sunday"};

而不是dayNumber，而是致电days[dayNumber]。

Ex：System.out.println(days[0]);将输出Monday

Answer 3

一个数字和一天之间没有固有的翻译。您需要手动编译翻译。

由于您的章节包含switch的使用，您应该研究如何使用此构造来设置变量的名称。

你需要像

这样的东西

String dayName;
switch (<a variable) {
<a number of switch branches>
}
<a print statement that uses the dayName variable>

如何在Java中显示日期名称？

3 个答案: