src/org/nutz/lang/Strings.java
public static String removeLast(CharSequence str) {
        if (str == null)
            return null;
        if (str.length() > 1)
            return str.subSequence(0, str.length() - 1).toString();
        return "";
    }
public static String removeLast(CharSequence str) {
        if (str == null)
            return null;
        if (str.length() > 1)
            return str.subSequence(0, str.length() - 1).toString();
        return "";
    }
截去最后一个字符
<p>
比如:
<ul>
<li>removeLast("12345") => 1234
<li>removeLast("A") => ""
</ul>

@param str
字符串
@return 新字符串