Web Notes
2016.08.20
Using Liquid in Jekyll - Live with Demos
Liquid is a simple template language that Jekyll uses to process pages for your site. With Liquid you can output complex contents without additional plugins.
A simple Java program to print out a calendar for the current month with highlightling the present day1.
import java.time.*;
public class Calendar {
public static void main(String[] args) {
LocalDate date = LocalDate.now();
int month = date.getMonthValue();
int today = date.getDayOfMonth();
date = date.minusDays(today - 1); // set to start of month
DayOfWeek weekday = date.getDayOfWeek();
int value = weekday.getValue(); // 1 = Monday, . . . , 7 = Sunday
System.out.println("Mon Tue Wed Thu Fri Sat Sun");
for (int i = 1; i < value; i++)
System.out.print(" ");
while (date.getMonthValue() == month) {
System.out.printf("%3d", date.getDayOfMonth());
if (date.getDayOfMonth() == today)
System.out.print("*");
else
System.out.print(" ");
date = date.plusDays(1);
if (date.getDayOfWeek().getValue() == 1)
System.out.println();
}
if (date.getDayOfWeek().getValue() != 1)
System.out.println();
}
}
Sample output looks like:
Mon Tue Wed Thu Fri Sat Sun
1 2 3 4 5
6* 7 8 9 10 11 12
13 14 15 16 17 18 19
20 21 22 23 24 25 26
27 28 29 30 31
First, construct an object that is initialized with the current date: LocalDate date = LocalDate.now().
Then, set back to the first day of this month and get the weekday of that date:
date = date.minusDays(today - 1);
DayOfWeek weekday = date.getDayOfWeek();
int value = weekday.getValue();
The variable weekday is set to an object of type DayOfWeek. The getValue() method of this object return a numerical value for the weekday. This yields an integer that follows the international convention where the weekend comes at the end of the week. This value was used to indent the calendar with appropriate first day of the month.
Now, it’s ready to print the body of the calendar. Inside the while loop, print the date value and mark the current date with an *. Then, advance the date to the next day with date.plusDays(1). When the iteration reaches the beginning of a new week, format the calendar with new line.
To quit the while loop, just check it’s still in this month as the date start from the first day of this month. This make sure no matter how many days (31, 30, 29, or 28) within this month.
Core Java Volume I (11th edition) - Cay S. Horstmann. ↩
THE END
Ads by Google
林宏
Frank Lin
Hey, there! This is Frank Lin (@flinhong), one of the 1.41 billion . This 'inDev. Journal' site holds the exploration of my quirky thoughts and random adventures through life. Hope you enjoy reading and perusing my posts.
YOU MAY ALSO LIKE
Web Notes
2015.09.26
HTML 相对路径和绝对路径区别分析
HTML 初学者会经常遇到这样一个问题，如何正确引用一个文件。比如，怎样在一个 HTML 网页中引用另外一个 HTML 网页作为超链接（hyperlink），怎样在一个网页中插入一张图片。如果你在引用文件时（如加入超链接，或者插入图片等），使用了错误的文件路径，就会导致引用失效（无法浏览链接文件，或无法显示插入的图片等）。
JavaScript Notes
2018.12.17
Practising closures in JavaScript
JavaScript is a very function-oriented language. As we know, functions are first class objects and can be easily assigned to variables, passed as arguments, returned from another function invocation, or stored into data structures. A function can access variable outside of it. But what happens when an outer variable changes? Does a function get the most recent value or the one that existed when the function was created? Also, what happens when a function invoked in another place - does it get access to the outer variables of the new place?
Ads by Google