得到某年某月的第一天和最后一天
import java.text.SimpleDateFormat;import java.util.Calendar;public class FirstEndOfMonth { /** * 得到某年某月的第一天 * * @param year * @param month * @return */ public String getFirstDayOfMonth(int year, int month) { Calendar cal = Calendar.getInstance(); cal.set(Calendar.YEAR, year); cal.set(Calendar.MONTH, month-1); cal.set(Calendar.DAY_OF_MONTH, cal.getMinimum(Calendar.DATE)); return new SimpleDateFormat("yyyy/MM/dd").format(cal.getTime()); } /** * 得到某年某月的最后一天 * * @param year * @param month * @return */ public String getLastDayOfMonth(int year, int month) { Calendar cal = Calendar.getInstance(); cal.set(Calendar.YEAR, year); cal.set(Calendar.MONTH, month-1); cal.set(Calendar.DAY_OF_MONTH, 1); int value = cal.getActualMaximum(Calendar.DAY_OF_MONTH); cal.set(Calendar.DAY_OF_MONTH, value); return new SimpleDateFormat("yyyy/MM/dd").format(cal.getTime()); } /** * * @param args */ public static void main(String[] args) { FirstEndOfMonth tFirstEndOfMonth = new FirstEndOfMonth(); System.out.println(tFirstEndOfMonth.getFirstDayOfMonth(2012, 2)); System.out.println(tFirstEndOfMonth.getLastDayOfMonth(2012, 2)); }}