java中最常用反转字串的方法

it2022-05-05  184

Java中经常会用到将字符串进行反转的时候,程序员孔乙己总结了5种反转方法,如下:

 

public class Test { public static void main(String[] args) { System.out.println(reverse1("qwert")); } //方法1 递归方法 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); } //方法2 通过 charAt(int index)返回char值进行字符串拼接 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3 把字符串转换成字符数组倒叙拼接然后返回值 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4 调用StringBuffer中的reverse方法 public static String reverse4(String s) { return new StringBuffer(s).reverse().toString(); } //方法5 把字符串转换成字符数组首位对调位置 public static String reverse5(String orig) { char[] s = orig.toCharArray(); int n = s.length - 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); } }

 


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