java 日历格式转化改进版

java 日历格式转化改进版

标签：java基础

原始版链接
二者的区别：

1.原始版，不修改CalendarBean.java文件，只改了Example8_16.java，也就是说，只是改变了日历的输出顺序。

2.改进版，修改了CalendarBean.java(改变了日历的存储顺序)，而日历的输出顺序不变(Example8_16.java改了日历的表头)。

//Example8_16
import java.util.*;

public class Example8_16 
{
    public static void main(String[] args) 
    {
        CalendarBean cb = new CalendarBean();
        System.out.printf("please input year and month: ");  //输入年份和月份
        Scanner reader = new Scanner(System.in);
        int year = 0, month = 0;
        cb.setYear(year = reader.nextInt());
        cb.setMonth(month = reader.nextInt());

        String [] a = cb.getCalendar();  //返回号码的一维数组
        char [] str = "一二三四五六日".toCharArray();  修改表头

        System.out.printf("----------------------------\n%14d.%-2d\n", year, month);  //打印表头
        System.out.printf("----------------------------\n");
        for(char c : str)  System.out.printf("%3c", c);

        for(int i = 0; i < a.length; i++)  //输出数组a
        {
            if(i % 7 == 0)  System.out.println("");  //换行
            System.out.printf("%4s", a[i]);
        }
    }
}

//CalendarBean
import java.util.Calendar;

public class CalendarBean
{
    int year = 0, month = 0;

    public void setYear(int year)
    {
        this.year = year;
    }
    public void setMonth(int month)
    {
        this.month = month;
    }
    public String [] getCalendar()
    {
        String [] a = new String[42];  //日历最多可达6行
        Calendar rili = Calendar.getInstance();

        rili.set(year, month - 1, 1);  //模拟翻日历
        int weekDay = rili.get(Calendar.DAY_OF_WEEK) - 2;  计算出1号的星期，唯一改动部分，与原始日历格式比较
        int day = 0;

        if(month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month == 12)  day = 31;
        if(month == 4 || month == 6 || month == 9 || month == 11)  day = 30;
        if(month == 2)
        {
            if(((year % 4 == 0) && (year % 100 != 0)) || year % 400 == 0)  day = 29;
            else  day = 28;
        }

        //if(weekDay == 0)  weekDay += 7;
        for(int i = 0; i < weekDay; i++)  a[i] = " ";  //日历顺序输出，格式控制
        for(int i = weekDay, n = 1; i < weekDay + day; i++)
        {
            a[i] = String.valueOf(n);
            n++;
        }
        for(int i = weekDay + day; i < a.length; i++)  a[i] = " ";

        return a;
    }
}

修改后的日历测试样例: