LeetCode___344. 反转字符串

编写一个函数,其作用是将输入的字符串反转过来。输入字符串以字符数组 char[] 的形式给出。

不要给另外的数组分配额外的空间,你必须原地修改输入数组、使用 O(1) 的额外空间解决这一问题。

你可以假设数组中的所有字符都是 ASCII 码表中的可打印字符。
示例 1:

输入:["h","e","l","l","o"]
输出:["o","l","l","e","h"]

示例 2:

输入:["H","a","n","n","a","h"]
输出:["h","a","n","n","a","H"]

思路:

      一:循环,分别将对称的字母调换

代码:

public static void reverseString(char[] s) {
        for(int i = 0;i < s.length/2;i++){
        	Character c = s[i];
        	s[i] = s[s.length - i - 1];
        	s[s.length - i - 1] = c;
        }
        System.out.println(s);

二:使用双指针,i=0和j=s.length() - 1,当i

代码:

public static void main(String[] args) {
		char[] s = {'a','b','c','d','e','f'};
		reverseString(s);
	}
	
	 public static void reverseString(char[] s) {
	        int i = 0;
	        int j = s.length - 1;
	        while(i <= s.length/2-1){
	            
	        	Character c = s[i];
	        	s[i] = s[j];
	        	s[j] = c;
	        	i++;
	        	j--;
//	        	System.out.println(s[i]);
	        }
	    
	       
//	        System.out.println(s);
	    }

 

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