java对字符串进行加星号处理

/** * 对字符串处理:将指定位置到指定位置的字符以星号代替 *  * @param content *            传入的字符串 * @param begin *            开始位置 * @param end *            结束位置 * @return */private static String getStarString(String content, int begin, int end) {if (begin >= content.length() || begin < 0) {return content;}if (end >= content.length() || end < 0) {return content;}if (begin >= end) {return content;}String starStr = "";for (int i = begin; i < end; i++) {starStr = starStr + "*";}return content.substring(0, begin) + starStr + content.substring(end, content.length());}/** * 对字符加星号处理：除前面几位和后面几位外，其他的字符以星号代替 *  * @param content *            传入的字符串 * @param frontNum *            保留前面字符的位数 * @param endNum *            保留后面字符的位数 * @return 带星号的字符串 */private static String getStarString2(String content, int frontNum, int endNum) {if (frontNum >= content.length() || frontNum < 0) {return content;}if (endNum >= content.length() || endNum < 0) {return content;}if (frontNum + endNum >= content.length()) {return content;}String starStr = "";for (int i = 0; i < (content.length() - frontNum - endNum); i++) {starStr = starStr + "*";}return content.substring(0, frontNum) + starStr+ content.substring(content.length() - endNum, content.length());}