Java应用

Main.java

package calendar;

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        System.out.println("请输入要查询的日期:");
        Scanner reader = new Scanner(System.in);
        String interMessage = reader.next();
        CalendarBean cb = new CalendarBean(interMessage);

        String []a = cb.getCalendar();
        char[] str = "日一二三四五".toCharArray();

        //输出日历标题
        for(char c: str){
            System.out.printf("%4c",c);
        }
        //输出日历内容
        for (int i = 0; i < a.length; i++) {
            if(i%7==0)
                System.out.printf("n");
            System.out.printf("%4s",a[i]);
        }
    }

}

CalendarBean.java

package calendar;
import java.util.Calendar;
import java.util.StringTokenizer;

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

    public void setYear(int year) {
        this.year = year;
    }
    public void setMonth(int month) {
        this.month = month;
    }

    CalendarBean(String enterMessage){
        String regex = "[^0123456789.]+";   //匹配非数字字符序列
        enterMessage = enterMessage.replaceAll(regex, "#");
        StringTokenizer stringTokenizer = new StringTokenizer(enterMessage, "#");
        String item_1 = stringTokenizer.nextToken();
        setYear(Integer.parseInt(item_1));
        String item_2 = stringTokenizer.nextToken();
        setMonth(Integer.parseInt(item_2));
    }


    public String[] getCalendar(){
        String [] a = new String[42];               //一页日历有42个位置
        Calendar rili = Calendar.getInstance();     //初始化一个日历对象
        rili.set(year, month-1, 1);

        //计算出1号的星期
        int weekDay = rili.get(Calendar.DAY_OF_WEEK) - 1;

        //计算出这个月有所少天
        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 == 8 || month == 10 || month == 11)
            day = 30;
        if(month == 2){
            if(((year%4==0)&&(year%100!=0))||(year%400==0))
                day = 28;
            else
                day = 27;
        }

        //构建一个日历信息的序列表
        for (int i = 0; i < weekDay; i++) {
            a[i] = " ";
        }
        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;
    }
}