請問如何編寫以下一個(gè)計(jì)算日期的Java代碼。

package com.cn.gjy;

成都創(chuàng)新互聯(lián)2013年開創(chuàng)至今，先為海珠等服務(wù)建站，海珠等地企業(yè)，進(jìn)行企業(yè)商務(wù)咨詢服務(wù)。為海珠企業(yè)網(wǎng)站制作PC+手機(jī)+微官網(wǎng)三網(wǎng)同步一站式服務(wù)解決您的所有建站問題。

import java.util.Scanner;

/*

說明：1這個(gè)應(yīng)該沒有問題，package是我編輯用的包名，你去掉；

2，純自己手打的

3剛剛看到你這個(gè)不是從外面輸入，那更簡單，你加一個(gè)set方法就OK了

public void setDay(int d){}然后調(diào)用一下就OK了

* 要用下列六種METHOD

* validateInput (判定用戶輸入是否正確)

* getMonth (拿月份名稱)

* isLeapYear (判定是否閏年)

* daysInMonth (確定一個(gè)月有多少天)

* computeTotalDays (計(jì)算從1月1日開始過去了多少天)

* nextDay (明天是幾號.)*/

public class JustJustJust {

private static int day;

private static int month;

private static int year;

static Scanner sc = new Scanner(System.in);

//輸入錯(cuò)誤則推出程序

public static void validateInput(){

System.out.println("請輸入年份");

//String dateYear = sc.next();

int dateYear = Integer.parseInt(sc.next());

if(dateYear2013dateYear1899) {

year = dateYear;

}else{

System.out.println("輸入錯(cuò)誤：超出范圍");

System.out.println("程序終止");

System.exit(0);

}

System.out.println("請輸入月份");

//String dateMon = sc.next();

int dateMon = Integer.parseInt(sc.next());

if(dateMon13dateMon0) {

month = dateMon;

}else{

System.out.println("輸入錯(cuò)誤：超出范圍");

System.out.println("程序終止");

System.exit(0);

}

System.out.println("請輸入日期");

//String dateDay = sc.next();

int dateDay = Integer.parseInt(sc.next());

if((month==1||month==3||month==5||month==7||month==8||month==10||month==12)(dateDay0dateDay33)){

day = dateDay;

}

else if((month==2)(year%4==0)){

if(year%100 !=0){

if(dateDay0dateDay30){

day = dateDay;

}else{

System.out.println("輸入錯(cuò)誤：超出范圍");

System.out.println("程序終止");

System.exit(0);

}

}

}

else if((month==2)(year%400==0)(dateDay0dateDay30))

{day=dateDay;}

else if((month==4||month==6||month==8||month==11)(dateDay0dateDay31))

{day=dateDay;}

else{

System.out.println("輸入錯(cuò)誤：超出范圍");

System.out.println("程序終止");

System.exit(0);

}

}

//獲取

//天

public static int getDay(){

return day;

}

//月

public int getMonth() {

return month;

}

//年

public int getYear() {

return year;

}

//判斷閏年

public static void isLeapYear(){

if((year%100 !=0)(year%4==0)){

System.out.println("今年是：" + year + "年" );

System.out.println("是閏年");

}else{

System.out.println("今年是：" + year + "年");

System.out.println("不是潤年");

}

}

public static void daysInMonth(){

if((year%100 !=0)(year%4==0)){

if((month==1||month==3||month==5||month==7||month==8||month==10||month==12)){

System.out.println("這個(gè)月是" + month + "月有31天");

}

else if(month == 2){

System.out.println("這個(gè)月是二月有29天");

}else{

System.out.println("這個(gè)月是" + month + "月有30天");

}

}else{

System.out.println("今年是：" + year + "年");

System.out.println("不是潤年");

if((month==1||month==3||month==5||month==7||month==8||month==10||month==12)){

System.out.println("這個(gè)月是" + month + "月有31天");

}

else if(month == 2){

System.out.println("這個(gè)月是二月有28天");

}else{

System.out.println("這個(gè)月是" + month + "月有30天");

}

}

}

public static int getFebDay(){

int febDay;

if((year%100 !=0)(year%4==0)){

febDay = 29;

}else{

febDay = 28;

}

return febDay;

}

public static void computeTotalDays(int m){

m = month;

switch(m)

{

case 1:m = 1;System.out.println("1月1日開始過去了" + (day + 0) + "天");break;

case 2:m = 2;System.out.println("1月1日開始過去了" + (day + 31) + "天");break;

case 3:m = 3; System.out.println("1月1日開始過去了" + (day + 31+ JustJustJust.getFebDay()) + "天");break;

case 4:System.out.println("1月1日開始過去了" + (day + 31+ JustJustJust.getFebDay() + 31) + "天");break;

/*

* 寫的匆忙，沒有想到社么好方法，你就以此類推吧

case 5:System.out.println("1月1日開始過去了" + (day + ) + "天");break;

case 6:System.out.println("1月1日開始過去了" + (day + ) + "天");break;

case 7:System.out.println("1月1日開始過去了" + (day + ) + "天");break;

case 8:System.out.println("1月1日開始過去了" + (day + ) + "天");break;

case 9:System.out.println("1月1日開始過去了" + (day + ) + "天");break;

case 10:System.out.println("1月1日開始過去了" + (day + ) + "天");break;

case 11:System.out.println("1月1日開始過去了" + (day + ) + "天");break;

case 12:System.out.println("1月1日開始過去了" + (day + ) + "天");break;

*/

}

}

public static void nextDay(){

System.out.println("明天是 " + (JustJustJust.getDay() + 1) + "號");

}

public static void main(String[] args) {

JustJustJust jjj = new JustJustJust();

jjj.validateInput();

jjj.getMonth();

jjj.isLeapYear();

jjj.daysInMonth();

jjj.computeTotalDays(month);

jjj.nextDay();

/*

* 要用下列六種METHOD

* validateInput (判定用戶輸入是否正確)

* getMonth (拿月份名稱)

* isLeapYear (判定是否閏年)

* daysInMonth (確定一個(gè)月有多少天)

* computeTotalDays (計(jì)算從1月1日開始過去了多少天)

* nextDay (明天是幾號.)*/

}

}

用Java編制一個(gè)日期計(jì)算程序

import java.util.Calendar; import java.util.Date; import java.util.Scanner; /** * */ /** * @author think * */ public class Test1 { /** * */ public Test1() { // TODO Auto-generated constructor stub } /** * function: * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub new Test1().print(); } /** * function: 打印函數(shù) 包含對當(dāng)前輸入的月歷的打印 以及輸入和輸出的打印 */ public void print(){ //當(dāng)月天數(shù) //輸入你的查詢年月 如果直接輸入月 默認(rèn)是當(dāng)前年 Scanner scanner = new Scanner(System.in); System.out.println("1.please input the month:"); int month = scanner.nextInt(); while(month = 0 || month 12) { System.out.println("1.please input the month:"); month = scanner.nextInt(); } int days = days(month); String[] weeks = {"sun","mon","tue","wed","thr","Frd","sat"}; for (int i = 0; i weeks.length; i++) { System.out.print(weeks[i]); for (int j = 0; j 2; j++) { System.out.print(" "); } } System.out.println(); int weekOfday = getWeekOfday(month,1); //獲得第一天的星期 for (int i = 0; i (weekOfday - 1) * 5; i++) { System.out.print(" "); } for (int i = 1; i = days; i++,weekOfday +=1) { if(weekOfday == 8) { weekOfday = 1; System.out.println(); System.out.print(i); } else { System.out.print(i); } for (int j = 0; j 5 - (String.valueOf(i).length()); j++) { System.out.print(" "); } } System.out.println("\n"); System.out.println("2.please input the date(format is like:20030204):"); String date = scanner.next(); while(date.length() 8) { System.out.println("2.please input the date(format is like:20030204):"); date = scanner.next(); } System.out.println("your input date weekday is:" + (getWeekDayStr(getWeekOfday(date)))); System.out.println("\n"); System.out.println("3.please input the compute date1(format is like:20030204):"); String date1 = scanner.next(); while(date.length() 8) { System.out.println("3.please input the compute date1(format is like:20030204):"); date1 = scanner.next(); } System.out.println("3.please input the compute date2(format is like:20030204):"); String date2 = scanner.next(); while(date.length() 8) { System.out.println("3.please input the compute date2(format is like:20030204):"); date2 = scanner.next(); } int xiangchadays = daysxiangcha(date1, date2); System.out.println("xiangcha days is:" + xiangchadays); } /** * function: 通過準(zhǔn)確的年月日查詢星期幾的整數(shù)表示 * @param year * @param month * @param day * @return */ public int getWeekOfday(int year,int month, int day) { Calendar c = Calendar.getInstance(); c.set(Calendar.YEAR, year); c.set(Calendar.MONTH, month - 1); c.set(Calendar.DAY_OF_MONTH, day); return c.get(Calendar.DAY_OF_WEEK); } /** * function: 通過輸入月日 查詢星期幾的整數(shù)表示 默認(rèn)是當(dāng)前年 * @param month * @param day * @return */ public int getWeekOfday(int month, int day) { Calendar c = Calendar.getInstance(); c.setTime(new Date()); int year = c.get(Calendar.YEAR); return getWeekOfday(year, month, day); } /** * function: 通過日期字符串獲得星期幾的整數(shù)表示 * @param dateStr * @return */ public int getWeekOfday(String dateStr) { int year =Integer.parseInt(dateStr.substring(0, 4)) ; int month =Integer.parseInt(dateStr.substring(4, 6)) ; int day =Integer.parseInt(dateStr.substring(6, 8)) ; return getWeekOfday(year, month, day); } /** * function: 返回星期幾這樣的表示 * @param weekday * @return */ public String getWeekDayStr(int weekday) { return weekDayStrs[weekday - Calendar.SUNDAY]; } String[] weekDayStrs = {"星期日","星期一","星期二","星期三","星期四","星期五","星期六"}; /** * function: 兩個(gè)日期的相差天數(shù) * @param dateStr1 20100205這樣的格式 * @param dateStr2 20100205這樣的格式 * @return */ public int daysxiangcha(String dateStr1,String dateStr2) { int year1 =Integer.parseInt(dateStr1.substring(0, 4)) ; int month1 =Integer.parseInt(dateStr1.substring(4, 6)) ; int day1 =Integer.parseInt(dateStr1.substring(6, 8)) ; int year2 =Integer.parseInt(dateStr2.substring(0, 4)) ; int month2 =Integer.parseInt(dateStr2.substring(4, 6)) ; int day2 =Integer.parseInt(dateStr2.substring(6, 8)) ; Calendar c1 = Calendar.getInstance(); c1.set(Calendar.YEAR, year1); c1.set(Calendar.MONTH, month1 -1); c1.set(Calendar.DAY_OF_MONTH, day1); Calendar c2 = Calendar.getInstance(); c2.set(Calendar.YEAR, year2); c2.set(Calendar.MONTH, month2 - 1); c2.set(Calendar.DAY_OF_MONTH, day2); long mills = c1.getTimeInMillis() c2.getTimeInMillis()? c1.getTimeInMillis() - c2.getTimeInMillis(): c2.getTimeInMillis() - c1.getTimeInMillis(); return (int)(mills/1000/3600/24); } /** * @param year * @param month * @return 某年某月的天數(shù) */ public static int days(int year,int month) { int days = 0; if(month!=2) { switch(month) { case 1: case 3: case 5: case 7: case 8: case 10: case 12:days = 31 ;break; case 4: case 6: case 9: case 11:days = 30; } } else { if(year%4==0 year%100!=0 || year%400==0) days = 29; else days = 28; } return days; } /** * function: 查詢某月的天數(shù) 默認(rèn)是當(dāng)前年份 * @param month * @return */ public static int days(int month) { Calendar c = Calendar.getInstance(); c.setTime(new Date()); int year = c.get(Calendar.YEAR); return days(year, month); } }

從鍵盤輸入兩個(gè)日期算出這兩個(gè)日期相差多少天。求java程序代碼！

如果你用上了 Java8：

import?java.time.LocalDate;

import?java.util.Scanner;

public?class?Demo?{

public?static?void?main(String[]?args)?throws?Exception?{

try?(Scanner?in?=?new?Scanner(System.in))?{

System.out.println("輸入第一個(gè)日期的年月日，并用空格分開：");

LocalDate?date1?=?LocalDate.of(in.nextInt(),?in.nextInt(),?in.nextInt());

System.out.println("輸入第二個(gè)日期的年月日，并用空格分開：");

LocalDate?date2?=?LocalDate.of(in.nextInt(),?in.nextInt(),?in.nextInt());

long?days?=?Math.abs(date1.toEpochDay()?-?date2.toEpochDay());

System.out.printf("這個(gè)兩個(gè)日期相差了?%d?天\n",?days);

}

}

}