方法一: (利用递归实现)
public static String reverse1(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 reverse1(right) + reverse1(left); //调用递归 }
方法二:(拼接字符串)
public static String reverse2(String s) { int length = s.length(); String reverse = ""; for (int i = 0; i < length; i++) reverse = s.charAt(i) + reverse; return reverse; }
方法三:(利用数组,倒序输出)
public static String reverse3(String s) { char[] array = s.toCharArray(); String reverse = ""; for (int i = array.length - 1; i >= 0; i--) reverse += array[i]; return reverse; }
方法四:(利用StringBuffer的内置reverse方法)
public static String reverse4(String s) { return new StringBuffer(s).reverse().toString(); }
方法五:(利用栈结构)
public static String reverse7(String s) { char[] str = s.toCharArray(); Stack<Character> stack = new Stack<Character>(); for (int i = 0; i < str.length; i++) stack.push(str[i]); String reversed = ""; for (int i = 0; i < str.length; i++) reversed += stack.pop(); return reversed; }