public static void main(String[] args) throws MalformedPatternException {
System.out.println(" a b c ".trim());
deleteFullSpace(" a b c ");
}
private static void deleteFullSpace(String testStr) {
// ^[ *| *]*"表示以全角空格或半角空格开始的所有集合
// [ *| *]*$"表示以全角空格或半角空格结尾的所有集合
String resultStr = testStr.replaceAll("^[ *| *]*", "").replaceAll("[ *| *]*$", "");
System.out.println("|" + resultStr + "|");
}