Java字符串截取

str.substring(int beginIndex,int endIndex)

indexOf（int ch） //返回特定字符的索引（下标）

/*
	 * Examples:
     * "hamburger".substring(4, 8) returns "urge"
     * "smiles".substring(1, 5) returns "mile"
     * @param      beginIndex   the beginning index, inclusive.开始下标包含在内
     * @param      endIndex     the ending index, exclusive.结束下标不包含在内
     * @return     the specified substring.
     * @exception  IndexOutOfBoundsException  if the
     *             {@code beginIndex} is negative, or
     *             {@code endIndex} is larger than the length of
     *             this {@code String} object, or
     *             {@code beginIndex} is larger than
     *             {@code endIndex}.
     */