用Calendar判断,判断每个月的13号,是不是星期五
让客户满意是我们工作的目标，不断超越客户的期望值来自于我们对这个行业的热爱。我们立志把好的技术通过有效、简单的方式提供给客户，将通过不懈努力成为客户在信息化领域值得信任、有价值的长期合作伙伴，公司提供的服务项目有：主机域名、虚拟主机、营销软件、网站建设、皮山网站维护、网站推广。
给你个例子看看
private static void test(int year) {
Format f = new SimpleDateFormat("yyyy-MM-dd");
boolean flg = false;
Calendar c = Calendar.getInstance();
c.set(Calendar.YEAR, year);
for (int i = Calendar.JANUARY; i = Calendar.DECEMBER; i++) {
c.set(Calendar.MONTH, i);
c.set(Calendar.DAY_OF_MONTH, 13);
if (c.get(Calendar.DAY_OF_WEEK) == Calendar.FRIDAY) {
System.out.println(f.format(c.getTime()));
flg = true;
}
}
if (!flg) {
System.out.println(year + "年没有黑色星期五.");
}
}
输入:2013
结果:
2013-09-13
2013-12-13
（把代码复制到一个新空白网页中即可，别看演示，演示的代码不对）
代码如下：
SCRIPT language=JavaScript
!--
/*****************************************************************************
日期资料
*****************************************************************************/
var lunarInfo=new Array(
0x04bd8,0x04ae0,0x0a570,0x054d5,0x0d260,0x0d950,0x16554,0x056a0,0x09ad0,0x055d2,
0x04ae0,0x0a5b6,0x0a4d0,0x0d250,0x1d255,0x0b540,0x0d6a0,0x0ada2,0x095b0,0x14977,
0x04970,0x0a4b0,0x0b4b5,0x06a50,0x06d40,0x1ab54,0x02b60,0x09570,0x052f2,0x04970,
0x06566,0x0d4a0,0x0ea50,0x06e95,0x05ad0,0x02b60,0x186e3,0x092e0,0x1c8d7,0x0c950,
0x0d4a0,0x1d8a6,0x0b550,0x056a0,0x1a5b4,0x025d0,0x092d0,0x0d2b2,0x0a950,0x0b557,
0x06ca0,0x0b550,0x15355,0x04da0,0x0a5d0,0x14573,0x052d0,0x0a9a8,0x0e950,0x06aa0,
0x0aea6,0x0ab50,0x04b60,0x0aae4,0x0a570,0x05260,0x0f263,0x0d950,0x05b57,0x056a0,
0x096d0,0x04dd5,0x04ad0,0x0a4d0,0x0d4d4,0x0d250,0x0d558,0x0b540,0x0b5a0,0x195a6,
0x095b0,0x049b0,0x0a974,0x0a4b0,0x0b27a,0x06a50,0x06d40,0x0af46,0x0ab60,0x09570,
0x04af5,0x04970,0x064b0,0x074a3,0x0ea50,0x06b58,0x055c0,0x0ab60,0x096d5,0x092e0,
0x0c960,0x0d954,0x0d4a0,0x0da50,0x07552,0x056a0,0x0abb7,0x025d0,0x092d0,0x0cab5,
0x0a950,0x0b4a0,0x0baa4,0x0ad50,0x055d9,0x04ba0,0x0a5b0,0x15176,0x052b0,0x0a930,
0x07954,0x06aa0,0x0ad50,0x05b52,0x04b60,0x0a6e6,0x0a4e0,0x0d260,0x0ea65,0x0d530,
0x05aa0,0x076a3,0x096d0,0x04bd7,0x04ad0,0x0a4d0,0x1d0b6,0x0d250,0x0d520,0x0dd45,
0x0b5a0,0x056d0,0x055b2,0x049b0,0x0a577,0x0a4b0,0x0aa50,0x1b255,0x06d20,0x0ada0)
var solarMonth=new Array(31,28,31,30,31,30,31,31,30,31,30,31);
var Gan=new Array("甲","乙","丙","丁","戊","己","庚","辛","壬","癸");
var Zhi=new Array("子","丑","寅","卯","辰","巳","午","未","申","酉","戌","亥");
var Animals=new Array("鼠","牛","虎","兔","龙","蛇","马","羊","猴","鸡","狗","猪");
var solarTerm = new Array("小寒","大寒","立春","雨水","惊蛰","春分","清明","谷雨","立夏","小满","芒种","夏至","小暑","大暑","立秋","处暑","白露","秋分","寒露","霜降","立冬","小雪","大雪","冬至")
var sTermInfo = new Array(0,21208,42467,63836,85337,107014,128867,150921,173149,195551,218072,240693,263343,285989,308563,331033,353350,375494,397447,419210,440795,462224,483532,504758)
var nStr1 = new Array('日','一','二','三','四','五','六','七','八','九','十')
var nStr2 = new Array('初','十','廿','卅',' ')
var monthName = new Array("JAN","FEB","MAR","APR","MAY","JUN","JUL","AUG","SEP","OCT","NOV","DEC");
//国历节日 *表示放假日
var sFtv = new Array(
"0101*元旦",
"0214 情人节",
"0308 妇女节",
"0312 植树节",
"0315 消费者权益日",
"0317 St. Patrick's",
"0401 愚人节",
"0501 劳动节",
"0504 青年节",
"0512 护士节",
"0512 茵生日",
"0601 儿童节",
"0614 Flag Day",
"0701 建党节 香港回归纪念",
"0703 炎黄在线诞辰",
"0718 托普诞辰",
"0801 建军节",
"0808 父亲节",
"0909 毛泽东逝世纪念",
"0910 教师节",
"0928 孔子诞辰",
"1001*国庆节",
"1006 老人节",
"1024 联合国日",
"1111 Veteran's / Remembrance Day",
"1112 孙中山诞辰纪念",
"1220 澳门回归纪念",
"1225 Christmas Day",
"1226 毛泽东诞辰纪念")
//农历节日 *表示放假日
var lFtv = new Array(
"0101*春节",
"0115 元宵节",
"0328 我生日",
"0505 端午节",
"0707 七夕情人节",
"0715 中元节",
"0815 中秋节",
"0909 重阳节",
"1208 腊八节",
"1224 小年",
"0100*除夕")
//某月的第几个星期几
var wFtv = new Array(
"0131 Martin Luther King Day",
"0231 President's Day",
"0520 母亲节",
"0530 Armed Forces Day",
"0531 Victoria Day",
"0716 合作节",
"0730 被奴役国家周",
"0811 Civic Holiday",
"0911 Labor Holiday",
"1021 Columbus Day",
"1144 Thanksgiving")
/*****************************************************************************
日期计算
*****************************************************************************/
//====================================== 传回农历 y年的总天数
function lYearDays(y) {
var i, sum = 348
for(i=0x8000; i0x8; i=1) sum += (lunarInfo[y-1900] i)? 1: 0
return(sum+leapDays(y))
}
//====================================== 传回农历 y年闰月的天数
function leapDays(y) {
if(leapMonth(y)) return((lunarInfo[y-1900] 0x10000)? 30: 29)
else return(0)
}
//====================================== 传回农历 y年闰哪个月 1-12 , 没闰传回 0
function leapMonth(y) {
return(lunarInfo[y-1900] 0xf)
}
//====================================== 传回农历 y年m月的总天数
function monthDays(y,m) {
return( (lunarInfo[y-1900] (0x10000m))? 30: 29 )
}
//====================================== 算出农历, 传入日期物件, 传回农历日期物件
// 该物件属性有 .year .month .day .isLeap .yearCyl .dayCyl .monCyl
function Lunar(objDate) {
var i, leap=0, temp=0
var baseDate = new Date(1900,0,31)
var offset = (objDate - baseDate)/86400000
this.dayCyl = offset + 40
this.monCyl = 14
for(i=1900; i2050 offset0; i++) {
temp = lYearDays(i)
offset -= temp
this.monCyl += 12
}
if(offset0) {
offset += temp;
i--;
this.monCyl -= 12
}
this.year = i
this.yearCyl = i-1864
leap = leapMonth(i) //闰哪个月
this.isLeap = false
for(i=1; i13 offset0; i++) {
//闰月
if(leap0 i==(leap+1) this.isLeap==false)
{ --i; this.isLeap = true; temp = leapDays(this.year); }
else
{ temp = monthDays(this.year, i); }
//解除闰月
if(this.isLeap==true i==(leap+1)) this.isLeap = false
offset -= temp
if(this.isLeap == false) this.monCyl ++
}
if(offset==0 leap0 i==leap+1)
if(this.isLeap)
{ this.isLeap = false; }
else
{ this.isLeap = true; --i; --this.monCyl;}
if(offset0){ offset += temp; --i; --this.monCyl; }
this.month = i
this.day = offset + 1
}
//==============================传回国历 y年某m+1月的天数
function solarDays(y,m) {
if(m==1)
return(((y%4 == 0) (y%100 != 0) || (y%400 == 0))? 29: 28)
else
return(solarMonth[m])
}
//============================== 传入 offset 传回干支, 0=甲子
function cyclical(num) {
return(Gan[num%10]+Zhi[num%12])
}
//============================== 月历属性
function calElement(sYear,sMonth,sDay,week,lYear,lMonth,lDay,isLeap,cYear,cMonth,cDay) {
this.isToday = false;
//国历
this.sYear = sYear;
this.sMonth = sMonth;
this.sDay = sDay;
this.week = week;
//农历
this.lYear = lYear;
this.lMonth = lMonth;
this.lDay = lDay;
this.isLeap = isLeap;
//干支
this.cYear = cYear;
this.cMonth = cMonth;
this.cDay = cDay;
this.color = '';
this.lunarFestival = ''; //农历节日
this.solarFestival = ''; //国历节日
this.solarTerms = ''; //节气
}
//===== 某年的第n个节气为几日(从0小寒起算)
function sTerm(y,n) {
var offDate = new Date( ( 31556925974.7*(y-1900) + sTermInfo[n]*60000 ) + Date.UTC(1900,0,6,2,5) )
return(offDate.getUTCDate())
}
//============================== 传回月历物件 (y年,m+1月)
function calendar(y,m) {
var sDObj, lDObj, lY, lM, lD=1, lL, lX=0, tmp1, tmp2
var lDPOS = new Array(3)
var n = 0
var firstLM = 0
sDObj = new Date(y,m,1) //当月一日日期
this.length = solarDays(y,m) //国历当月天数
this.firstWeek = sDObj.getDay() //国历当月1日星期几
for(var i=0;ithis.length;i++) {
if(lDlX) {
sDObj = new Date(y,m,i+1) //当月一日日期
lDObj = new Lunar(sDObj) //农历
lY = lDObj.year //农历年
lM = lDObj.month //农历月
lD = lDObj.day //农历日
lL = lDObj.isLeap //农历是否闰月
lX = lL? leapDays(lY): monthDays(lY,lM) //农历当月最后一天
if(n==0) firstLM = lM
lDPOS[n++] = i-lD+1
}
//sYear,sMonth,sDay,week,
//lYear,lMonth,lDay,isLeap,
//cYear,cMonth,cDay
this[i] = new calElement(y, m+1, i+1, nStr1[(i+this.firstWeek)%7],
lY, lM, lD++, lL,
cyclical(lDObj.yearCyl) ,cyclical(lDObj.monCyl), cyclical(lDObj.dayCyl++) )
if((i+this.firstWeek)%7==0) this[i].color = 'red' //周日颜色
if((i+this.firstWeek)%14==13) this[i].color = 'red' //周休二日颜色
}
//节气
tmp1=sTerm(y,m*2 )-1
tmp2=sTerm(y,m*2+1)-1
this[tmp1].solarTerms = solarTerm[m*2]
this[tmp2].solarTerms = solarTerm[m*2+1]
if(m==3) this[tmp1].color = 'red' //清明颜色
//国历节日
for(i in sFtv)
if(sFtv[i].match(/^(\d{2})(\d{2})([\s\*])(.+)$/))
if(Number(RegExp.$1)==(m+1)) {
this[Number(RegExp.$2)-1].solarFestival += RegExp.$4 + ' '
if(RegExp.$3=='*') this[Number(RegExp.$2)-1].color = 'red'
}
//月周节日
for(i in wFtv)
if(wFtv[i].match(/^(\d{2})(\d)(\d)([\s\*])(.+)$/))
if(Number(RegExp.$1)==(m+1)) {
tmp1=Number(RegExp.$2)
tmp2=Number(RegExp.$3)
this[((this.firstWeektmp2)?7:0) + 7*(tmp1-1) + tmp2 - this.firstWeek].solarFestival += RegExp.$5 + ' '
}
//农历节日
for(i in lFtv)
if(lFtv[i].match(/^(\d{2})(.{2})([\s\*])(.+)$/)) {
tmp1=Number(RegExp.$1)-firstLM
if(tmp1==-11) tmp1=1
if(tmp1 =0 tmp1n) {
tmp2 = lDPOS[tmp1] + Number(RegExp.$2) -1
if( tmp2 = 0 tmp2this.length) {
this[tmp2].lunarFestival += RegExp.$4 + ' '
if(RegExp.$3=='*') this[tmp2].color = 'red'
}
}
}
//黑色星期五
if((this.firstWeek+12)%7==5)
this[12].solarFestival += '黑色星期五 '
//今日
if(y==tY m==tM) this[tD-1].isToday = true;
}
//====================== 中文日期
function cDay(d){
var s;
switch (d) {
case 10:
s = '初十'; break;
case 20:
s = '二十'; break;
break;
case 30:
s = '三十'; break;
break;
default :
s = nStr2[Math.floor(d/10)];
s += nStr1[d%10];
}
return(s);
}
///////////////////////////////////////////////////////////////////////////////
var cld;
function drawCld(SY,SM) {
var i,sD,s,size;
cld = new calendar(SY,SM);
if(SY1874 SY1909) yDisplay = '光绪' + (((SY-1874)==1)?'元':SY-1874)
if(SY1908 SY1912) yDisplay = '宣统' + (((SY-1908)==1)?'元':SY-1908)
if(SY1911 SY1950) yDisplay = '民国' + (((SY-1911)==1)?'元':SY-1911)
// if(SY1949) yDisplay = '共和国' + (((SY-1949)==1)?'元':SY-1949)
// GZ.innerHTML = yDisplay +'年 农历' + cyclical(SY-1900+36) + '年 【'+Animals[(SY-4)%12]+'】';
if(SY1949) yDisplay = ''
GZ.innerHTML = yDisplay +' 农历' + cyclical(SY-1900+36) + '年 【'+Animals[(SY-4)%12]+'】';
YMBG.innerHTML = " " + SY + "BR " + monthName[SM];
for(i=0;i42;i++) {
sObj=eval('SD'+ i);
lObj=eval('LD'+ i);
sObj.className = '';
sD = i - cld.firstWeek;
if(sD-1 sDcld.length) { //日期内
sObj.innerHTML = sD+1;
if(cld[sD].isToday) sObj.className = 'todyaColor'; //今日颜色
sObj.style.color = cld[sD].color; //国定假日颜色
if(cld[sD].lDay==1) //显示农历月
lObj.innerHTML = 'b'+(cld[sD].isLeap?'闰':'') + cld[sD].lMonth + '月' + (monthDays(cld[sD].lYear,cld[sD].lMonth)==29?'小':'大')+'/b';
else //显示农历日
lObj.innerHTML = cDay(cld[sD].lDay);
s=cld[sD].lunarFestival;
if(s.length0) { //农历节日
if(s.length6) s = s.substr(0, 4)+'…';
s = s.fontcolor('red');
}
else { //国历节日
s=cld[sD].solarFestival;
if(s.length0) {
size = (s.charCodeAt(0)0 s.charCodeAt(0)128)?8:4;
if(s.lengthsize+2) s = s.substr(0, size)+'…';
s = s.fontcolor('blue');
}
else { //廿四节气
s=cld[sD].solarTerms;
if(s.length0) s = s.fontcolor('limegreen');
}
}
if(s.length0) lObj.innerHTML = s;
}
else { //非日期
sObj.innerHTML = '';
lObj.innerHTML = '';
}
}
}
function changeLong()
{
var y,m,ly,lm,id,im,iy,yangy,yangm,deltm,miny,tt;
CLD.SY.selectedIndex=CLD.D1.selectedIndex;
CLD.SM.selectedIndex=CLD.D2.selectedIndex;
yangm=0;yangy=0;
tt=true;
while (tt)
{
yangm=0;yangy=0;
changeCld();
for(i=0;i42;i++)
{
sD = i - cld.firstWeek;
if(sD-1 sDcld.length)
{ //日期内
if ((cld[sD].lMonth==CLD.D2.selectedIndex+1)(cld[sD].lYear==CLD.D1.selectedIndex+1900))
{
yangy=CLD.SY.selectedIndex+1900; yangm=CLD.SM.selectedIndex ;
tt=false;
break;
}
}
}
if (!tt) break;
pushBtm('MD');
changeCld();
// alert(CLD.SY.selectedIndex+" "+CLD.SM.selectedIndex);
for(i=0;i42;i++)
{
sD = i - cld.firstWeek;
if(sD-1 sDcld.length)
{ //日期内
if ((cld[sD].lMonth==CLD.D2.selectedIndex+1)(cld[sD].lYear==CLD.D1.selectedIndex+1900))
{
yangy=CLD.SY.selectedIndex+1900; yangm=CLD.SM.selectedIndex ;
tt=false;
break;
}
}
}
break;
}
// alert(yangy+" "+yangm);
//CLD.SY.selectedIndex=yangy;//-1900;
//pushBtm('YU');
//pushBtm('YD');
CLD.SM.selectedIndex=yangm;
pushBtm('MD');
pushBtm('MU');
}
//changeLong end
function changeCld() {
var y,m;
y=CLD.SY.selectedIndex+1900;
m=CLD.SM.selectedIndex;
drawCld(y,m);
}
function pushBtm(K) {
switch (K){
case 'YU' :
if(CLD.SY.selectedIndex0) CLD.SY.selectedIndex--;
break;
case 'YD' :
if(CLD.SY.selectedIndex149) CLD.SY.selectedIndex++;
break;
case 'MU' :
if(CLD.SM.selectedIndex0) {
CLD.SM.selectedIndex--;
}
else {
CLD.SM.selectedIndex=11;
if(CLD.SY.selectedIndex0) CLD.SY.selectedIndex--;
}
break;
case 'MD' :
if(CLD.SM.selectedIndex11) {
CLD.SM.selectedIndex++;
}
else {
CLD.SM.selectedIndex=0;
if(CLD.SY.selectedIndex149) CLD.SY.selectedIndex++;
}
break;
default :
CLD.SY.selectedIndex=tY-1900;
CLD.SM.selectedIndex=tM;
}
changeCld();
}
var Today = new Date();
var tY = Today.getFullYear();
var tM = Today.getMonth();
var tD = Today.getDate();
//////////////////////////////////////////////////////////////////////////////
var width = "130";
var offsetx = 2;
var offsety = 16;
var x = 0;
var y = 0;
var snow = 0;
var sw = 0;
var cnt = 0;
var dStyle;
document.onmousemove = mEvn;
//显示详细日期资料
function mOvr(v) {
var s,festival;
var sObj=eval('SD'+ v);
var d=sObj.innerHTML-1;
//sYear,sMonth,sDay,week,
//lYear,lMonth,lDay,isLeap,
//cYear,cMonth,cDay
if(sObj.innerHTML!='') {
sObj.style.cursor = 's-resize';
if(cld[d].solarTerms == '' cld[d].solarFestival == '' cld[d].lunarFestival == '')
festival = '';
else
festival = 'TABLE WIDTH=100% BORDER=0 CELLPADDING=2 CELLSPACING=0 BGCOLOR="#CCFFCC"TRTD'+
'FONT COLOR="#000000" STYLE="font-size:9pt;"'+cld[d].solarTerms + ' ' + cld[d].solarFestival + ' ' + cld[d].lunarFestival+'/FONT/TD'+
'/TR/TABLE';
s= 'TABLE WIDTH="130" BORDER=0 CELLPADDING="2" CELLSPACING=0 BGCOLOR="#000066"TRTD' +
'TABLE WIDTH=100% BORDER=0 CELLPADDING=0 CELLSPACING=0TRTD ALIGN="right"FONT COLOR="#ffffff" STYLE="font-size:9pt;"'+
cld[d].sYear+' 年 '+cld[d].sMonth+' 月 '+cld[d].sDay+' 日br星期'+cld[d].week+'br'+
'font color="violet"农历'+(cld[d].isLeap?'闰 ':' ')+cld[d].lMonth+' 月 '+cld[d].lDay+' 日/fontbr'+
'font color="yellow"'+cld[d].cYear+'年 '+cld[d].cMonth+'月 '+cld[d].cDay + '日/font'+
'/FONT/TD/TR/TABLE'+ festival +'/TD/TR/TABLE';
document.all["detail"].innerHTML = s;
if (snow == 0) {
dStyle.left = x+offsetx-(width/2);
dStyle.top = y+offsety;
dStyle.visibility = "visible";
snow = 1;
}
}
}
//清除详细日期资料
function mOut() {
if ( cnt = 1 ) { sw = 0 }
if ( sw == 0 ) { snow = 0; dStyle.visibility = "hidden";}
else cnt++;
}
//取得位置
function mEvn() {
x=event.x;
y=event.y;
if (document.body.scrollLeft)
{x=event.x+document.body.scrollLeft; y=event.y+document.body.scrollTop;}
if (snow){
dStyle.left = x+offsetx-(width/2)
dStyle.top = y+offsety
}
}
///////////////////////////////////////////////////////////////////////////
function tick() {
var today
today = new Date()
Clock.innerHTML = today.toLocaleString().replace(/(年|月)/g, "/").replace(/日/, "");
// Clock.innerHTML = TimeAdd(today.toGMTString(), CLD.TZ.value)
window.setTimeout("tick()", 1000);
}
function setCookie(name, value) {
var today = new Date()
var expires = new Date()
expires.setTime(today.getTime() + 1000*60*60*24*365)
document.cookie = name + "=" + escape(value) + "; expires=" + expires.toGMTString()
}
function getCookie(Name) {
var search = Name + "="
if(document.cookie.length 0) {
offset = document.cookie.indexOf(search)
if(offset != -1) {
offset += search.length
end = document.cookie.indexOf(";", offset)
if(end == -1) end = document.cookie.length
return unescape(document.cookie.substring(offset, end))
}
else return ""
}
}
/////////////////////////////////////////////////////////
function initial() {
dStyle = detail.style;
CLD.SY.selectedIndex=tY-1900;
CLD.SM.selectedIndex=tM;
drawCld(tY,tM);
// CLD.TZ.selectedIndex=getCookie("TZ");
// changeTZ();
tick();
}
//--
/SCRIPT
STYLE.todyaColor {
BACKGROUND-COLOR: aqua
}
/STYLE
META content="Microsoft FrontPage 4.0" name=GENERATOR/HEAD
BODY onload=initial()
SCRIPT language=JavaScript!--
if(navigator.appName == "Netscape" || parseInt(navigator.appVersion) 4)
document.write("h1你的浏览器无法执行此程序。/h1此程序在 IE4 以后的版本才能执行!!")
//--/SCRIPT
DIV id=detail style="POSITION: absolute"/DIV
FORM name=CLD
div align="center"
TABLE width="672" align="right" height="259" bordercolordark="#CC9900" border="4" background="l11.gif"
CENTER
center
TBODY
/center/center
TR
TD align=middle vAlign=top width="170" height="255"
div align="center"
center
TABLE BORDER=1 COLSPAN=2 width="221"
CENTER
centerFONT size=2
style="FONT-SIZE: 9pt"
td width="209"
p align="center"font style="font-size:10.8pt" color=RED本地计算机时间:/FONT/FONTBRFONT color=#000080 face=ARIAL
id=Clock size=3 align="center"/FONT
P!--时区 *表示自动调整为日光节约时间--
/center
/CENTER
/TABLE
/center
/div
div align="center"
center
table border=1 height="1" width="16"
td height="1" width="255"
table width="212" height="1"CENTER
center
FONT id=tSave
style="COLOR: red; FONT-FAMILY: Wingdings; FONT
package test;import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import java.util.List;/**
* @author Dev
* 黑色星期五
*/
public class BlackFriday { /**
* 题：有一种计算机病毒叫黑色星期五，如果当天是13号，又恰好是星期五，就会发作毁坏计算机的储存系统，
* 试以java编程找出上个世纪90年代这种病毒可能发作的日期
* 思路：90年代 90-99年 一共有120天可能性
*/
public static void main(String[] args) {
BlackFriday bf = new BlackFriday();
ListString dateList = bf.getYearList("90"); //根据给定的条件去获取需要查找病毒发作的年份的集合
ListList dayList = new ArrayListList(); //用来获取每年的13号的集合的集合（一年一个集合，所以在泛型里是个集合类型）
ListString dayColl = new ArrayListString(); //查找出的病毒发作的日期的集合
for (String year : dateList) { //遍历年份的集合
ListString list = bf.getDayList(year);//去获取每年的每月13号的一个集合
dayList.add(list); //将每年的集合放到一个集合中
}
for (ListString list : dayList) {
for (String day : list) { //遍历刚才获取到的日期的集合
if(isFriday(day)){ //判断每个日期是否是星期五，
dayColl.add(day);} //'是'-添加到结果集合中； '否'-则不添加
}
}
System.out.println("病毒发作的日期有：");
for (String string : dayColl) {
System.out.print(string+" ,");
}
}
//判断所传参数日期是否是星期五
private static boolean isFriday(String day) {
Date date = null;
try {
date = new SimpleDateFormat("yyyy-MM-dd").parse(day);//构造日期
} catch (ParseException e) {
e.printStackTrace();
}
Calendar c = Calendar.getInstance();
c.setTime(date);
int week = c.get(Calendar.DAY_OF_WEEK)-1; //获取这个日期所对应的是星期几
if(week==5) //如果是星期五，则返回true
return true;
else
return false;
}
//获取每年的每月13号集合
private ListString getDayList(String year) {
ListString list = new ArrayListString();
for(int i=1;i=12;i++){
if(String.valueOf(i).length()2){
StringBuffer sb = new StringBuffer(year+"-0"+i+"-13");
list.add(sb.toString());
}else{
StringBuffer sb = new StringBuffer(year+"-"+i+"-13");
list.add(sb.toString());
}
}
return list;
}
//获取给定条件的年份集合，这里的获取方法需要再略作修改，
//因为给定条件的不确定，所以我这里写的比较简略
private ListString getYearList(String dateStr) {
ListString list = new ArrayListString();
if(dateStr.equals("90")){
list.add("1990");list.add("1991");list.add("1992");list.add("1993");list.add("1994");list.add("1995");
list.add("1996");list.add("1997");list.add("1998");list.add("1999");
return list;
}
return list;
}
}
运行结果：病毒发作的日期有：
1990-04-13 ,1990-07-13 ,1991-09-13 ,1991-12-13 ,1992-03-13 ,1992-11-13 ,1993-08-13 ,1994-05-13 ,1995-01-13 ,1995-10-13 ,1996-09-13 ,1996-12-13 ,1997-06-13 ,1998-02-13 ,1998-03-13 ,1998-11-13 ,1999-08-13 ,