1,你可以用"+"來串連字元.2.你可以用stringBuffer的append方法,直接在後面加字元.你可以用上面兩種方法來寫出符合你要求的Join方法.import java.util.HashMap;import java.util.regex.Pattern;public class StringHelper { public static String join(String[] array){ return join(array, ""); } public static String join(String[] array, String delimiter){ int delimiterLength = delimiter.length(); if (array.length == 0) return ""; if (array.length == 1){ if (array[0] == null) return ""; return array[0]; } // of the resulting string. int length = 0; for (int i=0; inull. * @return Joined string. */ public static String join(final StringBuffer buff, final Object array[], final String delim) { boolean haveDelim = (delim != null); for (int i = 0; i < array.length; i++) { buff.append(array[i]); // if this is the last element then don't append delim if (haveDelim && (i + 1) < array.length) { buff.append(delim); } } return buff.toString(); } /** * Join an array of strings into one delimited string. * * @param array Array of objects to join as strings. * @param delim Delimiter to join strings with or null. * @return Joined string. */ public static String join(final Object array[], final String delim) { return join(new StringBuffer(), array, delim); } /** * Convert and join an array of objects into one string. * * @param array Array of objects to join as strings. * @return Converted and joined objects. */ public static String join(final Object array[]) { return join(array, null); } /** * Convert and join an array of bytes into one string. * * @param array Array of objects to join as strings. * @return Converted and joined objects. */ public static String join(final byte array[]) { Byte bytes[] = new Byte[array.length]; for (int i = 0; i < bytes.length; i++) { bytes[i] = new Byte(array[i]); } return join(bytes, null); } /** * Return a string composed of the given array. * * @param buff Buffer used to construct string value (not reset). * @param array Array of objects. * @param prefix String prefix. * @param separator Element sepearator. * @param suffix String suffix. * @return String in the format of: * prefix + n ( + separator + n+i)* + suffix. */ public static String join(final StringBuffer buff, final Object[] array, final String prefix, final String separator, final String suffix) { buff.append(prefix); join(buff, array, separator); buff.append(suffix); return buff.toString(); } /** * Return a string composed of the given array. * * @param array Array of objects. * @param prefix String prefix. * @param separator Element sepearator. * @param suffix String suffix. * @return String in the format of: * prefix + n ( + separator + n+i)* + suffix. */ public static String join(final Object[] array, final String prefix, final String separator, final String suffix) { return join(new StringBuffer(), array, prefix, separator, suffix); }}
