java字符串反转的7种方法 java字符串反转的7种方法

1、用stringBuffer或者stringBuilder自带的reverse方法
2、将字符串拆分为char数组
3、stringBuffer倒序拼接
4、利用栈的先进后出
5、二分换位反转
6、切割递归反转
7、二分递归反转

1、用stringBuffer或者stringBuilder自带的reverse方法

public static String reverseTestOne(String s) {return new StringBuffer(s).reverse().toString(); }

2、将字符串拆分为char数组

public static String reverseTestTwo(String s) {char[] charArray = s.toCharArray(); int start = 0, end = charArray.length - 1; for (; start < end; start++, end--) {charArray[start] ^= charArray[end]; //采用异或charArray[end] ^= charArray[start]; charArray[start] ^= charArray[end]; }return new String(charArray); }

两数交换除了用异或还能用其他方法，请移步不借助第三变量实现两数交换

3、stringBuffer倒序拼接

public static String reverseTestThree(String s) {StringBuffer sb = new StringBuffer(); for (int i = s.length() - 1; i >= 0; i--) {sb.append(s.charAt(i)); }return sb.toString(); }

4、利用栈的先进后出

public static String reverseTestFour(String s) {StringBuffer sb = new StringBuffer(); Stack stack = new Stack(); for (int i = 0; i < s.length(); i++) {stack.push(s.charAt(i)); }while (!stack.isEmpty()) {//stack会返回栈顶值，并且会把该值删除sb.append(stack.pop()); }return sb.toString(); }

5、二分换位反转

public static String reverseTestFive(String s) {int start = 0; int end = s.length() - 1; char[] charArray = s.toCharArray(); while (start < end) {//交换首尾char值char c = charArray[end]; charArray[end] = charArray[start]; charArray[start] = c; start++; end--; }return new String(charArray); }

6、切割递归反转

public static String reverseTestSix(String s) {if (s.length() <= 1) {return s; }return reverseTestSix(s.substring(1)) + s.substring(0, 1); }

7、二分递归反转

public static String reverseTestSeven(String s) {int length = s.length(); if (length <= 1) return s; String left = s.substring(0, length / 2); String right = s.substring(length / 2, length); return reverseTestSeven(right) + reverseTestSeven(left); }

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