Java取得:月初め、月末......

package vivi.test;

import java.util.Calendar;
/**
  *
  *   :                ，  ，  ，  ，  ，  ，     String   
  *      1、               today()
  *      2、              thisMonth()
  *      3、              thisMonthEnd()
  *      4、              thisSeason()
  *      5、              thisSeasonEnd()
  *      6、              thisYear()
  *      7、              thisYearEnd()
  *      8、            leapYear  
  *     :       ：xxxx-yy-zz (eg: 2007-12-05)
  *   :
  * @author pure
  */
public class Test {
	private int x;                  //     ： 
	private int y;                  //     ： 
	private int z;                  //     ： 
	private Calendar localTime;     //     
	
	public Test() {
	    localTime = Calendar.getInstance();
	}
	
	public static void main(String[] args){
		Test test = new Test();
		test.today();
	}
	/**
	 *   ：          ：xxxx-yy-zz (eg: 2007-12-05)
	 * @return String
	 * @author pure
	 */
	public String today() {
		String strY = null;
		String strZ = null;
		x = localTime.get(Calendar.YEAR);
		y = localTime.get(Calendar.MONTH) + 1;
		z = localTime.get(Calendar.DATE);
		strY = y >= 10 ? String.valueOf(y) : ("0" + y);
		strZ = z >= 10 ? String.valueOf(z) : ("0" + z);
		return x + "-" + strY + "-" + strZ;
	}
	/**
	  *   ：            ：xxxx-yy-zz (eg: 2007-12-01)
	  * @return String
	  * @author pure
	  */
	public String thisMonth() {
		String strY = null;
		x = localTime.get(Calendar.YEAR);
		y = localTime.get(Calendar.MONTH) + 1;
		strY = y >= 10 ? String.valueOf(y) : ("0" + y);return x + "-" + strY + "-01";
	}
	/**
	  *   ：            ：xxxx-yy-zz (eg: 2007-12-31)
	  * @return String
	  * @author pure
	  **/
	public String thisMonthEnd() {
		String strY = null;
		String strZ = null;
		boolean leap = false;
		x = localTime.get(Calendar.YEAR);
		y = localTime.get(Calendar.MONTH) + 1;
		if (y == 1 || y == 3 || y == 5 || y == 7 || y == 8 || y == 10 || y == 12) {
			strZ = "31";
		}
		if (y == 4 || y == 6 || y == 9 || y == 11) {
			strZ = "30";
		}
		if (y == 2) {
			leap = leapYear(x);
			if (leap) {
				strZ = "29";
			}else {
				strZ = "28";
			}
		}
		strY = y >= 10 ? String.valueOf(y) : ("0" + y);
		return x + "-" + strY + "-" + strZ;
	}

	/**
	  *   ：            ：xxxx-yy-zz (eg: 2007-10-01)<br>
      * @return String
      * @author pure
      */
	public String thisSeason() {
		String dateString = "";
		x = localTime.get(Calendar.YEAR);
		y = localTime.get(Calendar.MONTH) + 1;
		if (y >= 1 && y <= 3) {
			dateString = x + "-" + "01" + "-" + "01";
		}
		if (y >= 4 && y <= 6) {
			dateString = x + "-" + "04" + "-" + "01";
		}
		if (y >= 7 && y <= 9) {
			dateString = x + "-" + "07" + "-" + "01";
		}
		if (y >= 10 && y <= 12) {
			dateString = x + "-" + "10" + "-" + "01";
		}
		return dateString;
		}

	/**
	  *   ：            ：xxxx-yy-zz (eg: 2007-12-31)<br>
	  * @return String
	  * @author pure
	  */
	public String thisSeasonEnd() {
		String dateString = "";
		x = localTime.get(Calendar.YEAR);
		y = localTime.get(Calendar.MONTH) + 1;
		if (y >= 1 && y <= 3) {
			dateString = x + "-" + "03" + "-" + "31";
		}
		if (y >= 4 && y <= 6) {
			dateString = x + "-" + "06" + "-" + "30";
		}
		if (y >= 7 && y <= 9) {
			dateString = x + "-" + "09" + "-" + "30";
		}
		if (y >= 10 && y <= 12) {
			dateString = x + "-" + "12" + "-" + "31";
		}
		return dateString;
	}

	/**
	  *   ：            ：xxxx-yy-zz (eg: 2007-01-01)<br>
	  * @return String
	  * @author pure
	  */
	public String thisYear() {
		x = localTime.get(Calendar.YEAR);
		return x + "-01" + "-01";
	}
	
	/**
	  *   ：            ：xxxx-yy-zz (eg: 2007-12-31)<br>
	  * @return String
	  * @author pure
	  */
	public String thisYearEnd() {
		x = localTime.get(Calendar.YEAR);
		return x + "-12" + "-31";
	}
	
	/**
	  *   ：           <br>
	  * @param year
	  * @return  ：true   ：false
	  * @author pure
	  */
	public boolean leapYear(int year) {
		boolean leap;
		if (year % 4 == 0) {
			if (year % 100 == 0) {
				if (year % 400 == 0) leap = true;
					else leap = false;
				}
			else leap = true;
		}
		else leap = false;
		return leap;
	}
}