java计算两个时间相隔月数,考虑闰年

Question

我用的J2ME相对类比较少,希望能用Date类就能解决,例如SimpleDateFormat和GregorianCalendar等时间类都用不了.

我试图这样解决:
month1=(year1-year2)*12;
month2=month1-month2;
if(day1>=day2){
monthdiff=month1+month2+1;
else{
monthdiff=month1+month2-1;
}
思路不知道是否正确,另外在减天数时没有考虑到闰年,所以恳请大家帮忙解决.

Answer 1

/**
* 判断平闰年方法
*/
public void pingrunnian() {
int year = 0;
//从组件处得到年份(这里是用下拉菜单做的)
if (jtf3.getSelectedIndex() > 0) {
year = (Integer) jtf3.getSelectedItem();
}
int month = 0;
//从组件处得到月份(这里是用下拉菜单做的)

if (jtf4.getSelectedIndex() > 0) {
month = (Integer) jtf4.getSelectedItem();
}
int day = 0;
switch (month) {
//大月
case 1:
case 3:
case 5:
case 7:
case 8:
case 10:
case 12:
day = 31;
break;
//小月
case 4:
case 6:
case 9:
case 11:
day = 30;
break;
case 2:
if ((0 == year % 400) || (0 == year % 4 && 0 != year % 100)) {
day = 29;
} else {
day = 28;
}
break;
}
//下面的是向组件里添加得到的值的。 上面才是关键
//jtf5.removeAllItems();
//jtf5.addItem("DD");
//for (int i = 1; i <= day; i++) {
// jtf5.addItem(i);
}
}

Answer 2

java中Calendar类提供了月份计算方法的，直接通过Month方法进行计算得出月份差，之后算出年份的差乘以12，之后的和就是月份差。
public void monthSpace() throws ParseException {
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
String str1 = "2012-02-01";
String str2 = "2012-02-2";

Calendar bef = Calendar.getInstance();
Calendar aft = Calendar.getInstance();
bef.setTime(sdf.parse(str1));
aft.setTime(sdf.parse(str2));
int result = aft.get(Calendar.MONTH) - bef.get(Calendar.MONTH);
int month = (aft.get(Calendar.YEAR) - bef.get(Calendar.YEAR))*12;
System.out.println(month+result );
}

Answer 3

int day[12]={31,28,31,30,31,30,31,31,30,31,30,31};
if(year%4==0&&year%100!=0 or year%400==0){//闰年
day[1]++;
}

其实您是可以用那个自 1970年1月1日来毫秒数来对比相减再除于一定格式的时间就可以知道想距多少时间了

Answer 4

* 判断平闰年方法
*/
public void pingrunnian() {
int year = 0;
//从组件处得到年份(这里是用下拉菜单做的)
if (jtf3.getSelectedIndex() > 0) {
year = (Integer) jtf3.getSelectedItem();
}
int month = 0;
//从组件处得到月份(这里是用下拉菜单做的)

if (jtf4.getSelectedIndex() > 0) {
month = (Integer) jtf4.getSelectedItem();
}
int day = 0;
switch (month) {
//大月
case 1:
case 3:
case 5:
case 7:
case 8:
case 10:
case 12:
day = 31;
break;
//小月
case 4:
case 6:
case 9:
case 11:
day = 30;
break;
case 2:
if ((0 == year % 400) || (0 == year % 4 && 0 != year % 100)) {
day = 29;
} else {
day = 28;
}
break;
}
//下面的是向组件里添加得到的值的。 上面才是关键
//jtf5.removeAllItems();
//jtf5.addItem("DD");
//for (int i = 1; i <= day; i++) {
// jtf5.addItem(i);
}
}