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编写一个函数,其作用是将输入的字符串反转过来。
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示例 1:
输入: “hello”
输出: “olleh”
示例 2:
输入: “A man, a plan, a canal: Panama”
输出: “amanaP :lanac a ,nalp a ,nam A”
思路:最容易想到的就是遍历一遍然后把前后的位置元素互换,用一个t1变量临时存储内容;
public class Solution {
public String reverseString(String s) {
if(s.length()<1 || s==null) return s;
char[] s2 = s.toCharArray();
char t1 = 0;
for(int i = 0;i<s2.length/2;i++) {
t1 = s2[i];
s2[i] = s2[s2.length-i-1];
s2[s2.length-i-1] = t1;
}
for(int i = 0;i<s2.length;i++) {
System.out.println(s2[i]);
}
return String.valueOf(s2);
}
public static void main(String[] args) {
String s = "A man, a plan, a canal: Panama";
Solution s1 = new Solution();
s1.reverseString(s);
}
}