Android字符串反转、左移和右移

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反转

反转最简单的就是用StringBuilder和StringBuffer的reverse方法

private String reverseString(String original) { StringBuilder builder = new StringBuilder(); builder.append(original); return builder.reverse().toString(); }

左移和右移都有很多种方式来实现，这里简单介绍下三次反转法来实现左移右移

右移

/** * 右移index位 * @param from * @param index * @return */ private String rightMoveIndex(String from, int index) { from = reverseString(from); String first = from.substring(0,index); String second = from.substring(index); first = reverseString(first); second = reverseString(second); from = first + second; return from; }

左移

/** * 左移index位 * @param from * @param index * @return */ private String leftMoveIndex(String from, int index) { from = reverseString(from); String first = from.substring(0,from.length()-index-1); String second = from.substring(from.length() -index); first = reverseString(first); second = reverseString(second); from = first + second; return from; }

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