java新手求教，各位大神帮帮忙。。。小弟在线等。。。

Question

我的问题是：
像2017-03-01 到 2017-09-01 这两个日期之间想差了多少个季度，再得出每个季度的第一天和最后一天 这怎么搞，我搞了好久都没搞出来

Answer 1

String start = satrdate.substring(5,7);
int st = Integer.parseInt(start);
String end = enddate.substring(5,7);
int ed = Integer.parseInt(end);
int sm = 0;
int lm = 0;
if(st >= 2 && st < 5){
sm = 1;
}else if(st >= 5 && st < 8){
sm = 2;
}else if(st >= 8 && st < 11){
sm = 3;
}else{
sm = 4;
}
if(ed >= 2 && ed < 5){
lm = 1;
}else if(ed >= 5 && ed < 8){
lm = 2;
}else if(ed >= 8 && ed < 11){
lm = 3;
}else{
lm = 4;
}
int sum =lm-sm;
int mon = 0;
// throw new IllegalDataException("结束月份="+ed+" 开始月份="+st+" 季度差="+sum);
for(int i=0;i<=sum;i++){
if(i > 0){
mon = mon + 3;
}
Calendar calendar = Calendar.getInstance();
if(i == 0){
calendar.setTime(startdate);

int month = getQuarterInMonth(calendar.get(startdate.getMonth()), true);

calendar.set(Calendar.MONTH, month);

calendar.set(Calendar.DAY_OF_MONTH, 1);
GlobalVariable.log.debug("当季度的第一天：" + sf.format(calendar.getTime()));
// System.out.println("当季度的第一天：" + sf.format(calendar.getTime()));

// // 季度末

calendar.setTime(startdate);

month = getQuarterInMonth(calendar.get(startdate.getMonth()), false);

calendar.set(Calendar.MONTH, month + 1);

calendar.set(Calendar.DAY_OF_MONTH, 0);

GlobalVariable.log.debug("当前时间的季度末：" + sf.format(calendar.getTime()));
}else{
// 季度初

calendar.setTime(startdate);

int month = getQuarterInMonth(calendar.get(startdate.getMonth()), true);

calendar.set(Calendar.MONTH, month+mon);

calendar.set(Calendar.DAY_OF_MONTH, 1);
GlobalVariable.log.debug("当季度的第一天：" + sf.format(calendar.getTime()));
// System.out.println("当季度的第一天：" + sf.format(calendar.getTime()));

// // 季度末

calendar.setTime(startdate);

month = getQuarterInMonth(calendar.get(startdate.getMonth()), false);

calendar.set(Calendar.MONTH, month + 1+mon);

calendar.set(Calendar.DAY_OF_MONTH, 0);

GlobalVariable.log.debug("当前时间的季度末：" + sf.format(calendar.getTime()));
// System.out.println("当前时间的季度末：" + sf.format(calendar.getTime()));
}
}