先上原始碼：

 /**
     * Splits this string around matches of the given <a
     * href="../util/regex/Pattern.html#sum">regular expression</a>.
     *
     * <p> This method works as if by invoking the two-argument {@link
     * #split(String, int) split} method with the given expression and a limit
     * argument of zero.  Trailing empty strings are therefore not included in
     * the resulting array.
     *
     * <p> The string {@code "boo:and:foo"}, for example, yields the following
     * results with these expressions:
     *
     * <blockquote><table cellpadding=1 cellspacing=0 summary="Split examples showing regex and result">
     * <tr>
     *  <th>Regex</th>
     *  <th>Result</th>
     * </tr>
     * <tr><td align=center>:</td>
     *     <td>{@code { "boo", "and", "foo" }}</td></tr>
     * <tr><td align=center>o</td>
     *     <td>{@code { "b", "", ":and:f" }}</td></tr>
     * </table></blockquote>
     *
     *
     * @param  regex
     *         the delimiting regular expression
     *
     * @return  the array of strings computed by splitting this string
     *          around matches of the given regular expression
     *
     * @throws  PatternSyntaxException
     *          if the regular expression's syntax is invalid
     *
     * @see java.util.regex.Pattern
     *
     * @since 1.4
     * @spec JSR-51
     */
    public String[] split(String regex) {
        return split(regex, 0);
    }
 

翻譯註釋為：

/ **
     *圍繞給定<a的匹配拆分此字串
     * href =“../ util / regex / Pattern.html＃sum”>正則表示式</a>。
     *
     * <p>此方法就像呼叫雙引數{@link一樣
     * #split（String，int）split}方法與給定的表示式和限制
     *引數為零。因此，不包括尾隨空字串
     *結果陣列。
     *
     * <p>例如，字串{@code“boo：and：foo”}產生以下結果
     *這些表示式的結果：
     *
     * <blockquote> <table cellpadding = 1 cellspacing = 0 summary =“顯示正則表示式和結果的拆分示例”>
     * <tr>
     * <th>正則表示式</ th>
     * <th>結果</ th>
     * </ tr>
     * <tr> <td align = center>：</ td>
     * <td> {@ code {“boo”，“and”，“foo”}} </ td> </ tr>
     * <tr> <td align = center> o </ td>
     * <td> {@ code {“b”，“”，“：and：f”}} </ td> </ tr>
     * </ table> </ blockquote>
     *
     *
     * @param正則表示式
     *分隔正則表示式
     *
     * @return通過拆分此字串計算的字串陣列
     *圍繞給定正則表示式的匹配
     *
     * @throws PatternSyntaxException
     *如果正則表示式的語法無效
     *
     * @see java.util.regex.Pattern
     *
     * @since 1.4
     * @spec JSR-51
     * /

也就是根據正則表示式來分割字串！（可以實現多個符號同時分割字串）