JAVA计算两个日期相差月数

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
java.lang.Math;

int result = 0;

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");

Calendar c1 = Calendar.getInstance();
Calendar c2 = Calendar.getInstance();

//起始时间
c1.setTime(sdf.parse("2012-11-12"));
//结束时间
c2.setTime(sdf.parse( "2012-12-12"));

result = c2.get(Calendar.YEAR)*12 - c1.get(Calendar.YEAR) *12;
result = c2.get(Calendar.MONTH) - c1.get(Calendar.MONTH) + result;
int day = c2.get(Calendar.DAY_OF_MONTH) - c1.get(Calendar.DAY_OF_MONTH);
result = result + (day >= 0 ? 0 : -1);

return result;