p344

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LeetCode P344 Reverse String 题解

1.题目：

Write a function that takes a string as input and returns the string reversed.

Example:
Given s = “hello”, return “olleh”.

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题意：输入一个字符串返回它反转之后的字符串

2.代码

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package leetcode;

import java.util.Scanner;

/**
 * 
 * @author ZhangMengRou
 *
 */
public class p344 {

	public static void main(String[] args) {
		Scanner in = new Scanner(System.in);
		String a = in.nextLine();
		String ans = new String();
		ans = reverseString(a);
		System.out.print(ans);
	}

	public static String reverseString(String s) {
		
		StringBuilder bu = new StringBuilder();
		StringBuilder ans = new StringBuilder();
		bu.append(s);
		int len = bu.length();
		for (int i = len - 1; i > -1; i--) {
			ans.append(s.charAt(i));
		}
		// System.out.print(ans);
		return new String(ans);
	}

}

3.一些总结：了解输入输出