/*
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package arthurv.java.spring.learn;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.Locale;
import java.util.Properties;
import java.util.Set;
import java.util.StringTokenizer;
import java.util.TreeSet;

/**
 */
public abstract class StringUtils {

	private static final String FOLDER_SEPARATOR = "/";

	private static final String WINDOWS_FOLDER_SEPARATOR = "\\";

	private static final String TOP_PATH = "..";

	private static final String CURRENT_PATH = ".";

	private static final char EXTENSION_SEPARATOR = '.';


	//---------------------------------------------------------------------
	// General convenience methods for working with Strings
	//---------------------------------------------------------------------

        //判斷str是否為空值
	public static boolean hasLength(CharSequence str) {
		return (str != null && str.length() > 0);
	}

	/**
         * 判斷字串是否有長度
         * 注意CharSequence是String類的上層介面
         * @param str
         * @return 
         */
	public static boolean hasLength(String str) {
		return hasLength((CharSequence) str);
	}

	/**
         * 判斷CharSequence是否有實際內容，空格不算
	 * <p><pre>
	 * StringUtils.hasText(null) = false
	 * StringUtils.hasText("") = false
	 * StringUtils.hasText(" ") = false
	 * StringUtils.hasText("12345") = true
	 * StringUtils.hasText(" 12345 ") = true
	 */
	public static boolean hasText(CharSequence str) {
                //如果str為空，返回false
		if (!hasLength(str)) {
			return false;
		}
                //獲取str的長度
		int strLen = str.length();
                //迴圈遍歷str
		for (int i = 0; i < strLen; i++) {
                        //如果在0到strlen之間，有一個不是空格，說明有內容，返回true
			if (!Character.isWhitespace(str.charAt(i))) {
				return true;
			}
		}
		return false;
	}

	/**
         * 判斷str是否是實際內容，純空格組成的str返回false
	 */
	public static boolean hasText(String str) {
		return hasText((CharSequence) str);
	}

	/**
         *檢測CharSequence是否有空白字元
	 */
	public static boolean containsWhitespace(CharSequence str) {
                //如果長度為0，則返回false
		if (!hasLength(str)) {
			return false;
		}
		int strLen = str.length();
                //迴圈遍歷str
		for (int i = 0; i < strLen; i++) {
                       //如果在0到strLen之間有空白符，則返回true
			if (Character.isWhitespace(str.charAt(i))) {
				return true;
			}
		}
		return false;
	}

	/**
         *判斷給定的字串str是否含有空白符
	 */
	public static boolean containsWhitespace(String str) {
		return containsWhitespace((CharSequence) str);
	}

	/**
         * 去掉str開頭和結尾的空白符
	 */
	public static String trimWhitespace(String str) {
                //如果沒有長度，則放回str
		if (!hasLength(str)) {
			return str;
		}
                
                
		StringBuilder sb = new StringBuilder(str);
                //如果sb.charAt(0)是空白符的話，刪除該空白符
		while (sb.length() > 0 && Character.isWhitespace(sb.charAt(0))) {
			sb.deleteCharAt(0);
		}
                //如果末尾是空白符的話，也刪除該空白符
		while (sb.length() > 0 && Character.isWhitespace(sb.charAt(sb.length() - 1))) {
			sb.deleteCharAt(sb.length() - 1);
		}
                //返回去掉開頭結尾空白符之後的字串
		return sb.toString();
	}

	/**
         *刪除給定的字串中所有的空白符
	 */
	public static String trimAllWhitespace(String str) {
                //如果str沒有長度，返回str
		if (!hasLength(str)) {
			return str;
		}
		StringBuilder sb = new StringBuilder(str);
		int index = 0;
                //迴圈遍歷sb
		while (sb.length() > index) {
                        //如果當前位置index為空白符，則刪除之
			if (Character.isWhitespace(sb.charAt(index))) {
				sb.deleteCharAt(index);
			}
			else {
				index++;
			}
		}
                //返回去掉空白符之後的字串
		return sb.toString();
	}

	/**
         *刪除掉str的開頭的空白符，如果有的話
	 */
	public static String trimLeadingWhitespace(String str) {
               //如果str的長度為0，返回str
		if (!hasLength(str)) {
			return str;
		}
		StringBuilder sb = new StringBuilder(str);
                //如果開頭有字串，則刪除之
		while (sb.length() > 0 && Character.isWhitespace(sb.charAt(0))) {
			sb.deleteCharAt(0);
		}
                //返回刪除開頭空白符的字串
		return sb.toString();
	}

	/**
	 * 刪除str結尾的空白符，如果結尾是空白符的話
	 */
	public static String trimTrailingWhitespace(String str) {
               //如果str的長度為0，返回str
		if (!hasLength(str)) {
			return str;
		}
		StringBuilder sb = new StringBuilder(str);
                //如結尾頭有字串，則刪除之
		while (sb.length() > 0 && Character.isWhitespace(sb.charAt(sb.length() - 1))) {
			sb.deleteCharAt(sb.length() - 1);
		}
                //返回刪除開頭空白符的字串
		return sb.toString();
	}

	/**
          *刪除str中開頭是字元是給定字元的那個字元
	 */
	public static String trimLeadingCharacter(String str, char leadingCharacter) {
               //如果str的長度為0，返回str
		if (!hasLength(str)) {
			return str;
		}
		StringBuilder sb = new StringBuilder(str);
                //判斷sb的開頭是否==leadingCharacter,若是就刪除，否則什麼也不做
		while (sb.length() > 0 && sb.charAt(0) == leadingCharacter) {
			sb.deleteCharAt(0);
		}
		return sb.toString();
	}

	/**
         *刪除結尾等於trailingCharacter的那個字元
	 */
	public static String trimTrailingCharacter(String str, char trailingCharacter) {
                 //如果str的長度為0，返回str
		if (!hasLength(str)) {
			return str;
		}
		StringBuilder sb = new StringBuilder(str);
                 //判斷sb的開頭是否==leadingCharacter,若是就刪除，否則什麼也不做
		while (sb.length() > 0 && sb.charAt(sb.length() - 1) == trailingCharacter) {
			sb.deleteCharAt(sb.length() - 1);
		}
		return sb.toString();
	}


	/**
	 *檢測str的字首是否是prefix，大小寫不敏感
	 */
	public static boolean startsWithIgnoreCase(String str, String prefix) {
		if (str == null || prefix == null) {
			return false;
		}
                //如果是則返回true
		if (str.startsWith(prefix)) {
			return true;
		}
                //如果str小於字首，則返回false
		if (str.length() < prefix.length()) {
			return false;
		}
                //設定大小寫不明感
                //把str的前面長度等於prefix的字元變小寫
		String lcStr = str.substring(0, prefix.length()).toLowerCase();
                //把prefix變小寫
		String lcPrefix = prefix.toLowerCase();
                //判斷
		return lcStr.equals(lcPrefix);
	}

	/**
	 *檢測str的字尾是否是prefix，大小寫不敏感
	 */
	public static boolean endsWithIgnoreCase(String str, String suffix) {
		if (str == null || suffix == null) {
			return false;
		}
                //如果字尾是suffix，返回true
		if (str.endsWith(suffix)) {
			return true;
		}
		if (str.length() < suffix.length()) {
			return false;
		}
               //設定大小寫不敏感
		String lcStr = str.substring(str.length() - suffix.length()).toLowerCase();
		String lcSuffix = suffix.toLowerCase();
		return lcStr.equals(lcSuffix);
	}

	/**
         * 判斷給定的str中是否有在位置index處存在子序列subString
	 */
	public static boolean substringMatch(CharSequence str, int index, CharSequence substring) {
		for (int j = 0; j < substring.length(); j++) {
			int i = index + j;
                        //如果i>=str.length說明str字串自index到最後的長度小於subString
                        //str.charAt(i) != substring.charAt(j),如果當前j位置字元和str中i位置字元不相等
			if (i >= str.length() || str.charAt(i) != substring.charAt(j)) {
				return false;
			}
		}
		return true;
	}

	/**
         *檢測str中出現sub子字串的個數.
	 */
	public static int countOccurrencesOf(String str, String sub) {
               //邊界處理
		if (str == null || sub == null || str.length() == 0 || sub.length() == 0) {
			return 0;
		}
                //計數器
		int count = 0;
                //記錄當前位置
		int pos = 0;
		int idx;
                //indexOf(String str,int fromIndex)str - 要搜尋的子字串。
                //fromIndex - 開始搜尋的索引位置
                //如果含有此sub，則計數器+1
		while ((idx = str.indexOf(sub, pos)) != -1) {
			++count;
                        //下一個開始比較的位置
			pos = idx + sub.length();
		}
                //返回sub出現的個數
		return count;
	}

	/**
         * 用newPattern來替換inString中的oldPattern
	 */
	public static String replace(String inString, String oldPattern, String newPattern) {
               //邊界處理
		if (!hasLength(inString) || !hasLength(oldPattern) || newPattern == null) {
			return inString;
		}
                
		StringBuilder sb = new StringBuilder();
		int pos = 0;
                //返回oldPattern在inString的位置索引
		int index = inString.indexOf(oldPattern);
                //記錄oldPattern的長度
		int patLen = oldPattern.length();
		while (index >= 0) {
                        //儲存index之前的inString子串
			sb.append(inString.substring(pos, index));
                        //拼接新的字元（串）
			sb.append(newPattern);
			pos = index + patLen;
                        //檢測pos之後是否還有oldPattern,如果有繼續替換
			index = inString.indexOf(oldPattern, pos);
		}
                //拼接pos之後的字串
		sb.append(inString.substring(pos));
		// remember to append any characters to the right of a match
		return sb.toString();
	}

	/**
         *刪除inString中符合pattern要求的字元（串）
         * 實現方法是：把inString中符合pattern的字元（串）替換成“”從而實現刪除
	 */
	public static String delete(String inString, String pattern) {
		return replace(inString, pattern, "");
	}

	/**
         * 到此可以發先StringBuilder的強大作用
         * 刪除inString中在charsToDelete中存在的字元
         * 例如
         * inString = "abddfkjfd";
         * charsToDelete = "cdjf";
         * 則處理後的inString = "abk"
	 */
	public static String deleteAny(String inString, String charsToDelete) {
                //邊界處理
		if (!hasLength(inString) || !hasLength(charsToDelete)) {
			return inString;
		}
                //字元構造器
		StringBuilder sb = new StringBuilder();
                //迴圈遍歷inString,判斷每個字元是否在charsToDelete中
		for (int i = 0; i < inString.length(); i++) {
                       //獲取當前位置i的字元c
			char c = inString.charAt(i);
                        //如果charsToDelete中不包含c，則拼接到sb中
			if (charsToDelete.indexOf(c) == -1) {
				sb.append(c);
			}
		}
                //返回處理過的字串
		return sb.toString();
	}


	//---------------------------------------------------------------------
	// Convenience methods for working with formatted Strings
	//---------------------------------------------------------------------

	/**
	 * 用單引號把非空的str括起來，例如str == "hello" 那麼返回的將是‘hello’
	 */
	public static String quote(String str) {
		return (str != null ? "'" + str + "'" : null);
	}

	/**
	 * 如果給定的物件是String型別，則呼叫quote方法處理，否則什麼都不做原樣返回
	 */
	public static Object quoteIfString(Object obj) {
		return (obj instanceof String ? quote((String) obj) : obj);
	}

	/**
	 * Unqualify a string qualified by a '.' dot character. For example,
	 * "this.name.is.qualified", returns "qualified".
	 * @param qualifiedName the qualified name
	 */
	public static String unqualify(String qualifiedName) {
		return unqualify(qualifiedName, '.');
	}

	/**
	 * 獲取給定的字串中，最後一個滿足分隔符separator之後字串，
         * 例如 qualifiedName = "this:name:is:qualified"
         *     separator = ':'
         * 那麼處理過後的字串就是 qualified
	 */
	public static String unqualify(String qualifiedName, char separator) {
		return qualifiedName.substring(qualifiedName.lastIndexOf(separator) + 1);
	}

	/**
         *設定首字母為大寫
	 */
	public static String capitalize(String str) {
		return changeFirstCharacterCase(str, true);
	}

	/**
         *設定str首字母為小寫
	 */
	public static String uncapitalize(String str) {
		return changeFirstCharacterCase(str, false);
	}

	private static String changeFirstCharacterCase(String str, boolean capitalize) {
		if (str == null || str.length() == 0) {
			return str;
		}
		StringBuilder sb = new StringBuilder(str.length());
		if (capitalize) {//如果首字母要求大寫的話
			sb.append(Character.toUpperCase(str.charAt(0)));
		}
		else {   //否則首字母設定為小寫
			sb.append(Character.toLowerCase(str.charAt(0)));
		}
                //拼接首字母剩下的字串
		sb.append(str.substring(1));
		return sb.toString();
	}

	/**
	 * 獲得給用路徑path中的檔名
	 * 例如 "mypath/myfile.txt" -> "myfile.txt".
	 */
	public static String getFilename(String path) {
                //邊界處理
		if (path == null) {
			return null;
		}
                //獲得path中最後一個檔案分隔符‘/’的位置
		int separatorIndex = path.lastIndexOf(FOLDER_SEPARATOR);
                //如果沒有分隔符，說明給定的就是檔名，直接返回即可，否則返回分隔符剩下的字元
		return (separatorIndex != -1 ? path.substring(separatorIndex + 1) : path);
	}

	/**
	 *獲得檔名的副檔名，也就是格式
	 * e.g. "mypath/myfile.txt" -> "txt".
	 */
	public static String getFilenameExtension(String path) {
                //邊界處理
		if (path == null) {
			return null;
		}
                //獲得最後一個‘.’的位置
		int extIndex = path.lastIndexOf(EXTENSION_SEPARATOR);
		if (extIndex == -1) {
			return null;
		}
                //找到最後一個檔案分隔符‘/’的位置
		int folderIndex = path.lastIndexOf(FOLDER_SEPARATOR);
                //如果folderIndex在extIndex的右邊，返回null
		if (folderIndex > extIndex) {
			return null;
		}
                //返回‘.’之後的子字串
		return path.substring(extIndex + 1);
	}

	/**
	 *過濾掉檔案的副檔名
	 * 例如. "mypath/myfile.txt" -> "mypath/myfile".
	 */
	public static String stripFilenameExtension(String path) {
                //邊界處理
		if (path == null) {
			return null;
		}
                //獲得最後一個‘.’的位置
		int extIndex = path.lastIndexOf(EXTENSION_SEPARATOR);
		if (extIndex == -1) {
			return path;
		}
                //找到最後一個檔案分隔符‘/’的位置
		int folderIndex = path.lastIndexOf(FOLDER_SEPARATOR);
                 //如果folderIndex在extIndex的右邊，path是檔案路徑，沒有副檔名可言，直接原樣返回
		if (folderIndex > extIndex) {
			return path;
		}
                //返回濾掉副檔名之後的子字串
		return path.substring(0, extIndex);
	}

	/**
         * 該方法的作用如下
         * 如果path = "/hello/world/ relativePtah = "java"
         * 經過處理後返回 /hello/world/java
         * 如果path = "helloworld" 那麼處理後返回java
         * 這個方法少了空值判斷，個人覺得加上嚴謹些
	 */
	public static String applyRelativePath(String path, String relativePath) {
               //找到最後個檔案分隔符的位置
		int separatorIndex = path.lastIndexOf(FOLDER_SEPARATOR);
		if (separatorIndex != -1) {//如果有檔案分隔符
                       //獲得從0到最後一個分隔符之前的子字串
			String newPath = path.substring(0, separatorIndex);
                        //如果relativePath不是以檔案分隔符開頭
			if (!relativePath.startsWith(FOLDER_SEPARATOR)) {
                               //把newPath後面追加一個/
				newPath += FOLDER_SEPARATOR;
			}
                        //返回newPath+relativePath
			return newPath + relativePath;
		}
		else {//如果沒有，就返回relativePath
			return relativePath;
		}
	}//end

	/**
	 * Normalize the path by suppressing sequences like "path/.." and
	 * inner simple dots.
	 * <p>The result is convenient for path comparison. For other uses,
	 * notice that Windows separators ("\") are replaced by simple slashes.
	 * @param path the original path
	 * @return the normalized path
	 */
	public static String cleanPath(String path) {
                //邊界處理
		if (path == null) {
			return null;
		}
                //用/地體pathToUse的\\
		String pathToUse = replace(path, WINDOWS_FOLDER_SEPARATOR, FOLDER_SEPARATOR);

		// Strip prefix from path to analyze, to not treat it as part of the
		// first path element. This is necessary to correctly parse paths like
		// "file:core/../core/io/Resource.class", where the ".." should just
		// strip the first "core" directory while keeping the "file:" prefix.
                //找到：的位置
		int prefixIndex = pathToUse.indexOf(":");
		String prefix = "";
                //如果：不存在
		if (prefixIndex != -1) {
                        //字首是pathToUse中從0到prefixIndex的字元，包括：
			prefix = pathToUse.substring(0, prefixIndex + 1);
                        //獲得冒號之後的所有字元（串）
			pathToUse = pathToUse.substring(prefixIndex + 1);
		}
		if (pathToUse.startsWith(FOLDER_SEPARATOR)) {//如果pathToUse是以/開頭
                        //把prefix +/
			prefix = prefix + FOLDER_SEPARATOR;
                        //過濾掉開頭的/
			pathToUse = pathToUse.substring(1);
		}

		String[] pathArray = delimitedListToStringArray(pathToUse, FOLDER_SEPARATOR);
		List<String> pathElements = new LinkedList<String>();
		int tops = 0;

		for (int i = pathArray.length - 1; i >= 0; i--) {
			String element = pathArray[i];
			if (CURRENT_PATH.equals(element)) {
				// Points to current directory - drop it.
			}
			else if (TOP_PATH.equals(element)) {
				// Registering top path found.
				tops++;
			}
			else {
				if (tops > 0) {
					// Merging path element with element corresponding to top path.
					tops--;
				}
				else {
					// Normal path element found.
					pathElements.add(0, element);
				}
			}
		}

		// Remaining top paths need to be retained.
		for (int i = 0; i < tops; i++) {
			pathElements.add(0, TOP_PATH);
		}

		return prefix + collectionToDelimitedString(pathElements, FOLDER_SEPARATOR);
	}

	/**
	 * Compare two paths after normalization of them.
	 * @param path1 first path for comparison
	 * @param path2 second path for comparison
	 * @return whether the two paths are equivalent after normalization
	 */
	public static boolean pathEquals(String path1, String path2) {
		return cleanPath(path1).equals(cleanPath(path2));
	}

	

        //檢測是否是有效路徑locale的語法是locale -O 64 -a | -m | -c -k Name ... 
	private static void validateLocalePart(String localePart) {
		for (int i = 0; i < localePart.length(); i++) {
			char ch = localePart.charAt(i);
                       //檢測當前字元 
			if (ch != '_' && ch != ' ' && !Character.isLetterOrDigit(ch)) {
				throw new IllegalArgumentException(
						"Locale part \"" + localePart + "\" contains invalid characters");
			}
		}
	}


	//---------------------------------------------------------------------
	// Convenience methods for working with String arrays
	//---------------------------------------------------------------------

	/**
	 * Append the given String to the given String array, returning a new array
         * 
	 */
	public static String[] addStringToArray(String[] array, String str) {
                //如果arry==null或者裡面沒有元素
		if (ObjectUtils.isEmpty(array)) {
			return new String[] {str};
		}
                //擴充套件一個新陣列
		String[] newArr = new String[array.length + 1];
                //把array內容複製到newArr裡面
		System.arraycopy(array, 0, newArr, 0, array.length);
                //把str新增到陣列末尾
		newArr[array.length] = str;
                //返回新陣列
		return newArr;
	}

	/**
         * 合併兩個陣列，直接無條件合併，即使兩個陣列有重複的元素
         *  array1空則返回array2 ，array2空則返回array1
	 */
	public static String[] concatenateStringArrays(String[] array1, String[] array2) {
		if (ObjectUtils.isEmpty(array1)) {
			return array2;
		}
		if (ObjectUtils.isEmpty(array2)) {
			return array1;
		}
                //建立一個新陣列
		String[] newArr = new String[array1.length + array2.length];
                //資料複製
		System.arraycopy(array1, 0, newArr, 0, array1.length);
		System.arraycopy(array2, 0, newArr, array1.length, array2.length);
                //返回一個新陣列
		return newArr;
	}

	/**
         *合併兩個陣列，如果兩個陣列有重複元素的話，只選擇一個合併即可
	 */
	public static String[] mergeStringArrays(String[] array1, String[] array2) {
                //如果array1空的話，返回array2
		if (ObjectUtils.isEmpty(array1)) {
			return array2;
		}
                //如果array2空的話，返回array1
		if (ObjectUtils.isEmpty(array2)) {
			return array1;
		}
                //定義一個array連結串列
		List<String> result = new ArrayList<String>();
                //先裝array1
		result.addAll(Arrays.asList(array1));
                //把array2跟array1不同的元素裝入連結串列
		for (String str : array2) {
			if (!result.contains(str)) {
				result.add(str);
			}
		}
                
		return toStringArray(result);
	}

	/**
	 * Turn given source String array into sorted array.
	 * @param array the source array
	 * @return the sorted array (never <code>null</code>)
	 */
	public static String[] sortStringArray(String[] array) {
		if (ObjectUtils.isEmpty(array)) {
			return new String[0];
		}
		Arrays.sort(array);
		return array;
	}

	/**
         * 把集合轉化為陣列
	 */
	public static String[] toStringArray(Collection<String> collection) {
            //邊界處理
		if (collection == null) {
			return null;
		}
                //toArray(T[] a)把list裡面的元素放入a中，並返回a
		return collection.toArray(new String[collection.size()]);
	}

	/**
          *把Enumeration型別轉化為陣列
	 */
	public static String[] toStringArray(Enumeration<String> enumeration) {
		if (enumeration == null) {
			return null;
		}
                //先轉換為list
		List<String> list = Collections.list(enumeration);
                //toArray(T[] a)把list裡面的元素放入a中，並返回a
		return list.toArray(new String[list.size()]);
	}

	/**
         *選擇 字元陣列array中首部或者尾部都是空白的元素（字串）,去掉其空白
	 */
	public static String[] trimArrayElements(String[] array) {
                //如果array為空，則返回長度為0的陣列
		if (ObjectUtils.isEmpty(array)) {
			return new String[0];
		}
                //建立一個length為array.length的陣列，其實具體實現上沒這個必要
		String[] result = new String[array.length];
		for (int i = 0; i < array.length; i++) {
                       //獲取當前元素
			String element = array[i];
                        //如果當前元素不為空，則返回經過trim處理的字串
                        //trim()此字串移除了前導和尾部空白的副本，如果沒有前導和尾部空白，則返回此字串。
                        //直接array[i] = (element != null ? element.trim() : null);也可以
			result[i] = (element != null ? element.trim() : null);
		}
                //返回一個新陣列
		return result;
	}

	/**
         *去掉陣列中的重複的元素
         * 方法：遍歷陣列，把元素加入set裡自動過濾掉重複的元素，由於使用set，導致處理過的陣列
         * 是排好序的陣列
	 */
	public static String[] removeDuplicateStrings(String[] array) {
                //如果陣列為空，直接返回array
		if (ObjectUtils.isEmpty(array)) {
			return array;
		}
		Set<String> set = new TreeSet<String>();
                //迴圈遍歷陣列，把陣列元素加入到set裡
		for (String element : array) {
			set.add(element);
		}
                //把set轉化為陣列
		return toStringArray(set);
	}

	/**
          *把一個字串分按照delimiter分割成兩個子字串，組成陣列返回
	 */
	public static String[] split(String toSplit, String delimiter) {
               //邊界處理。個人認為該邊界處理的有問題，如果toSplit不為空而delimiter為空的話，返回的最好是原來的字串組成的
              //長度為一的陣列 new String[]{toSplit}，可該做法直接返回了空值
		if (!hasLength(toSplit) || !hasLength(delimiter)) {
			return null;
		}
                //獲得delimiter的位置
		int offset = toSplit.indexOf(delimiter);
		if (offset < 0) {//此時不符合要求
			return null;
		}
                //獲得在delimiter之前的子字串
		String beforeDelimiter = toSplit.substring(0, offset);
                //獲得在delimiter之後的子字串
		String afterDelimiter = toSplit.substring(offset + delimiter.length());
                //組成陣列返回
		return new String[] {beforeDelimiter, afterDelimiter};
	}

	/**
	 * Take an array Strings and split each element based on the given delimiter.
	 * A <code>Properties</code> instance is then generated, with the left of the
	 * delimiter providing the key, and the right of the delimiter providing the value.
	 * <p>Will trim both the key and value before adding them to the
	 * <code>Properties</code> instance.
	 * @param array the array to process
	 * @param delimiter to split each element using (typically the equals symbol)
	 * @param charsToDelete one or more characters to remove from each element
	 * prior to attempting the split operation (typically the quotation mark
	 * symbol), or <code>null</code> if no removal should occur
	 * @return a <code>Properties</code> instance representing the array contents,
	 * or <code>null</code> if the array to process was <code>null</code> or empty
	 */
	public static Properties splitArrayElementsIntoProperties(
			String[] array, String delimiter, String charsToDelete) {

		if (ObjectUtils.isEmpty(array)) {
			return null;
		}
		Properties result = new Properties();
		for (String element : array) {
			if (charsToDelete != null) {
				element = deleteAny(element, charsToDelete);
			}
			String[] splittedElement = split(element, delimiter);
			if (splittedElement == null) {
				continue;
			}
			result.setProperty(splittedElement[0].trim(), splittedElement[1].trim());
		}
		return result;
	}

	/**
	 * Tokenize the given String into a String array via a StringTokenizer.
	 * Trims tokens and omits empty tokens.
	 * <p>The given delimiters string is supposed to consist of any number of
	 * delimiter characters. Each of those characters can be used to separate
	 * tokens. A delimiter is always a single character; for multi-character
	 * delimiters, consider using <code>delimitedListToStringArray</code>
	 * @param str the String to tokenize
	 * @param delimiters the delimiter characters, assembled as String
	 * (each of those characters is individually considered as delimiter).
	 * @return an array of the tokens
	 * @see java.util.StringTokenizer
	 * @see java.lang.String#trim()
	 * @see #delimitedListToStringArray
	 */
	public static String[] tokenizeToStringArray(String str, String delimiters) {
		return tokenizeToStringArray(str, delimiters, true, true);
	}

	/**
	 * Tokenize the given String into a String array via a StringTokenizer.
	 * <p>The given delimiters string is supposed to consist of any number of
	 * delimiter characters. Each of those characters can be used to separate
	 * tokens. A delimiter is always a single character; for multi-character
	 * delimiters, consider using <code>delimitedListToStringArray</code>
	 * @param str the String to tokenize
	 * @param delimiters the delimiter characters, assembled as String
	 * (each of those characters is individually considered as delimiter)
	 * @param trimTokens trim the tokens via String's <code>trim</code>
	 * @param ignoreEmptyTokens omit empty tokens from the result array
	 * (only applies to tokens that are empty after trimming; StringTokenizer
	 * will not consider subsequent delimiters as token in the first place).
	 * @return an array of the tokens (<code>null</code> if the input String
	 * was <code>null</code>)
	 * @see java.util.StringTokenizer
	 * @see java.lang.String#trim()
	 * @see #delimitedListToStringArray
	 */
	public static String[] tokenizeToStringArray(
			String str, String delimiters, boolean trimTokens, boolean ignoreEmptyTokens) {

		if (str == null) {
			return null;
		}
		StringTokenizer st = new StringTokenizer(str, delimiters);
		List<String> tokens = new ArrayList<String>();
		while (st.hasMoreTokens()) {
			String token = st.nextToken();
			if (trimTokens) {
				token = token.trim();
			}
			if (!ignoreEmptyTokens || token.length() > 0) {
				tokens.add(token);
			}
		}
		return toStringArray(tokens);
	}



	public static String arrayToDelimitedString(Object[] arr, String delim) {
               //邊界處理
		if (ObjectUtils.isEmpty(arr)) {
			return "";
		}
		if (arr.length == 1) {
                       //把一個物件arr[0]通過呼叫nullSafeToString轉化為String
			return ObjectUtils.nullSafeToString(arr[0]);
		}
		StringBuilder sb = new StringBuilder();
		for (int i = 0; i < arr.length; i++) {
			if (i > 0) {
				sb.append(delim);
			}
			sb.append(arr[i]);
		}
		return sb.toString();
	}



}