[Java知识库]利用java计算日期是星期几

日期类

package day01;

class Day {
    private int year;
    private int month;
    private int data;

    // 构造函数
    Day(int year,int month,int data){
        this.year = year;
        this.month = month;
        this.data = data;
    }

    public int getData() {
        return data;
    }

    public void setData(int data) {
        this.data = data;
    }

    public int getMonth() {

        return month;
    }
    public void setMonth(int month) {

        this.month = month;
    }

    public void setYear(int year) {

        this.year = year;
    }
    public int getYear() {

        return year;
    }

    void set(int year,int month,int data){
        this.year = year;
        this.month = month;
        this.data = data;
    }

    int getBirthday(){              // 计算日期是星期几的方法
        int y = year;               // 0 为周末 1为周一 ......以此类推
        int m = month;
        if(m == 1 || m == 2){       // 若为一二月分时，年减一 月加上12个月
            y--;
            m += 12;
        }
        return (y + y / 4 - y / 100 +y / 400 +(13 * m + 8) / 5 + data) % 7;
    }


}

Day使用示例

package day01;

import java.util.Scanner;

class DayTester {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String[] week = {"周日","周一","周二","周三","周四","周五","周六"};
        System.out.println("请输入您的阳历生日日期！");

        System.out.println("年：");
        int y = scanner.nextInt();

        System.out.println("月：");
        int m = scanner.nextInt();

        System.out.println("日：");
        int d = scanner.nextInt();

        Day birthday = new Day(y,m,d);

        System.out.println("您的生日：" + birthday.getYear() + "月" + birthday.getMonth() + "日" + birthday.getData() + "是" + week[birthday.getBirthday()]);

    }

}