利用StringBuffer把字符串反转

package com.shujia.day11;

import java.util.Scanner;

/*
    把字符串反转
 */
public class StringBufferDemo6 {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入一个要反转的字符串: ");
        String info = sc.next();
        System.out.println("反转前：" + info);

        // String -> StringBuffer
        StringBuffer sb = new StringBuffer(info);

        //调用StringBuffer中的反转方法
        sb.reverse();

        //StringBuffer->String
        String res = sb.toString();

        System.out.println("反转后：" + res);


        StringBuffer sb2 = new StringBuffer();
        sb2.append(100);

        StringBuilder sb3 = new StringBuilder();
        sb3.append(100);

    }
}