代码库（输入一个数据，转换为字符串，翻转它）

package cn.com;

import java.util.Scanner;

public class stringFlip2 {
    public static void main(String[] ages){
        Scanner s = new Scanner(System.in);
        System.out.println("输入一个数，放入字符串中");
        if (s.hasNextLine()) {
            String A = s.nextLine();
            System.out.println("输入的数据为：" + A);
            System.out.println("--------------");
            for(int i = A.length() -1;i>=0;i--){
                System.out.println(A.charAt(i));
            }
            System.out.println("------------");
            System.out.println("变换前:" + A);
            System.out.println("变换后:" + reverse1(A));
        }
        s.close();
    }
        
        //第1种方法
        // StringBuffer 将字符串翻转 
    public static String reverse1(String Str) {
        return new StringBuilder(Str).reverse().toString();
    }
}

//2.第二种方法
public static String reverse1(String str) {
    char[] chars = str.toCharArray();
    String reverse = "";
    for (int i = chars.length - 1; i >= 0; i--) {
        reverse += chars[i];
    }
    return reverse;
}

//第3种方法
public static String reverse1(String str) {
    String reverse = "";
    int length = str.length();
    for (int i = 0; i < length; i++) {
        reverse = str.charAt(i) + reverse;
    }
    return reverse;
}