DATE和DAY_OF_MONTH有啥区别

[joejoe1991]

Calendar里的DATE和DAT_OF_MONTH有啥区别？

在帮助里看着好像没区别
为什么我做一道题的时候 把DATE设置成2结果是对的，可是把DAY_OF_MONTH设置成2就不对了，设置成1才对？

谢谢了！

[joejoe1991]

人呢

[malligator]

Your Code？

[joejoe1991]

import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Calendar;
import java.util.Scanner;

public class wenjian
{
public static void main(String args[])
{
int nian=0;
int yue=0;
Scanner dedao=new Scanner(System.in);

System.out.print("请输入年:");
nian=dedao.nextInt();
System.out.print("请输入月:");
yue=dedao.nextInt();

if (nian<0 || yue<0 || yue>12)
System.out.println("请输入正确的信息!");
else
{
shijian a=new shijian(nian,yue);
a.shezhiriqi();
a.dedaoxingqi();
a.jisuanxingqi();
a.xianshi();

}

}
}

class shijian
{
//声明成员
private int nian; //保存年
private int yue; //保存月
private String xingqi; //得到日期字符串
private int shuzi = 0; //把日期转换成数字后保存到这里
private int runnian = 0; //判断闰年

//声明对象
Date riqi = null;
Calendar setriqi = Calendar.getInstance();
SimpleDateFormat format = new SimpleDateFormat("E");

//以下是构造方法
public shijian(int nian, int yue) {
this.nian = nian;
this.yue = yue;

if (nian % 4 == 0 && nian % 100 != 0) //判断闰年代码块
runnian = 1;
else if (nian % 100 == 0 && nian % 400 == 0)
runnian = 1;
}

void shezhiriqi() { //把用户输入的年月设置为setriqi对象里的一部分
setriqi.set(Calendar.YEAR, nian);
setriqi.set(Calendar.MONTH, yue - 1);
setriqi.set(Calendar.DAY_OF_MONTH, 1);
riqi = setriqi.getTime(); //把设置后的时间生成一个Date对象返回给riqi引用
}

void dedaoxingqi() { // 输入riqi里的星期，把星期值赋给字符串xingqi
xingqi = format.format(riqi);
System.out.println("xingqi: "+xingqi);
}

void jisuanxingqi() { //对xingqi的值进行检测
if (xingqi.equals("星期一"))
shuzi = 1;
else if (xingqi.equals("星期二"))
shuzi = 2;
else if (xingqi.equals("星期三"))
shuzi = 3;
else if (xingqi.equals("星期四"))
shuzi = 4;
else if (xingqi.equals("星期五"))
shuzi = 5;
else if (xingqi.equals("星期六"))
shuzi = 6;
else if (xingqi.equals("星期日"))
shuzi = 0;
}

void xianshi() {
int tianshu; //检测用户输入的月份有多少天
switch (yue) {
case 1:
case 3:
case 5:
case 7:
case 8:
case 10:
case 12:
tianshu = 31;
break;
default:
tianshu = 30;
}

if (runnian == 1 && yue == 2) //如果是闰年而且月份是2月
tianshu = 29; //tianshu就是29
else if (runnian != 1 && yue == 2)
tianshu = 28; //如果不是闰年不过月份是2月 那tianshu就是28

System.out.println("\t\t\t\t" + nian + "\t" + yue + "\n"); //输出
System.out.println("\t日\t一\t二\t三\t四\t五\t六");

for (int i = 0; i < shuzi; i++) { //输出tab 为了对齐
System.out.print("\t");
}
for (int i = 1; i <= tianshu; i++, shuzi++) {
if (shuzi == 7) { //把值循环输出
System.out.print("\n");
shuzi = 0;
}

System.out.print("\t" + i);
}
}
}

就是这些

[joejoe1991]

人呢

[shmilywhw]

你是要做一个日历出来吧 其实不用那么麻烦去判断是否是闰年 也不需要去用switch判断每个月多少天，我写个代码你运行一下

[shmilywhw]

package project;

import java.util.Calendar;

public class CalendarTable {
public CalendarTable() {
}

public static void main(String[] args) {
Calendar rightNow = Calendar.getInstance();
int year, month;
year = rightNow.get(Calendar.YEAR);
month = rightNow.get(Calendar.MONTH);

int num = rightNow.getActualMaximum(Calendar.DAY_OF_MONTH);

rightNow.set(year, month, 1);
int now = rightNow.get(Calendar.DAY_OF_WEEK);

System.out.println("\t" + "\t" + "\t" + year + "年" + " " + (month + 1) +
" 月");
System.out.println("\t" + "日" + "\t" + "一" + "\t" + "二" + "\t" + "三" +
"\t" + "四" + "\t" + "五" + "\t" + "六");
for (int j = 1; j < (now); j++) {
System.out.print("\t");
}
for (int i = 1; i <= (num); i++) {
System.out.print("\t" + i);
if ((i + now - 1) % 7 == 0) {
System.out.println();
}
}
}
}
这段代码是直接根据系统的时间打印当前时间的日历
你可以改一下 改成通过输入来打印日历

[joejoe1991]

呃 看的有点晕 可还是没有回答我的问题啊

DATE和DAY_OF_MONTH有啥区别？