1.最简单的方法:public static String reverse1(String str){ return new StringBuffer(str).reverse().toString();}2.最常用的方法:public static String reverse3(String s) { char[] array = (); String reverse = ""; //注意这是空串,不是null for (int i = - 1; i >= 0; i--) reverse += array[i]; return reverse; } 3.常用方法的变形: public static String reverse2(String s){ int length = (); String reverse = ""; //注意这是空串,不是null for (int i = 0; i < length; i++) reverse = (i) + reverse;//在字符串前面连接, 而非常见的后面 return reverse; } 语言中常用的方法: public static String reverse5(String orig){ char[] s = (); int n = - 1; int halfLength = n / 2; for (int i = 0; i <= halfLength; i++) { char temp = s[i]; s[i] = s[n - i]; s[n - i] = temp; } return new String(s); //知道 char数组和String相互转化 }