Java用于取得當前日期相對應的月初，月末，季初，季末，年初，年末時間

package com.zrar.date;
import java.util.Calendar;
/**



描述:此類用于取得當前日期相對應的月初，月末，季初，季末，年初，年末，返回值均為String字符串
1、得到當前日期         today()
2、得到當前月份月初      thisMonth()
3、得到當前月份月底      thisMonthEnd()
4、得到當前季度季初      thisSeason()
5、得到當前季度季末      thisSeasonEnd()
6、得到當前年份年初      thisYear()
7、得到當前年份年底      thisYearEnd()
8、判斷輸入年份是否為閏年 leapYear

注意事項:  日期格式為：xxxx-yy-zz (eg: 2007-12-05)
*
實例:
*
@author pure
*/
public class DateThis {
 private int x;                  // 日期屬性：年
 private int y;                  // 日期屬性：月
 private int z;                  // 日期屬性：日
 private Calendar localTime;     // 當前日期
 public DateThis() {
 localTime = Calendar.getInstance();

 }
 /**

功能：得到當前日期 格式為：xxxx-yy-zz (eg: 2007-12-05)<br> 
@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;
}
/**
功能：得到當前月份月初 格式為：xxxx-yy-zz (eg: 2007-12-01)<br> 
@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";
}
/**
功能：得到當前月份月底 格式為：xxxx-yy-zz (eg: 2007-12-31)<br> 
@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;
}
/**
功能：得到當前季度季初 格式為：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;
}
/**
功能：得到當前季度季末 格式為：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;
}
/**
功能：得到當前年份年初 格式為：xxxx-yy-zz (eg: 2007-01-01)<br> 
@return String
@author pure
*/
public String thisYear() {
 x = localTime.get(Calendar.YEAR);
 return x + "-01" + "-01";
}
/**
功能：得到當前年份年底 格式為：xxxx-yy-zz (eg: 2007-12-31)<br> 
@return String
@author pure
*/
public String thisYearEnd() {
 x = localTime.get(Calendar.YEAR);
 return x + "-12" + "-31";
}
/**
功能：判斷輸入年份是否為閏年<br>

@param year
@return 是：true  否：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;
}
}</pre>