JAVA base (the StringBuffer string reversal)

1, demand: to reverse a string

            Example: keyboard input "abc"        

            Output: "cba"

            

        StringBuffer implemented functions    

 

2, code implementation

import java.util.Scanner;





public class Test2 {





    /**

     * * A:案例演示

    *

            需求：把字符串反转

                举例：键盘录入"abc"        

                输出结果："cba"

                

            用StringBuffer的功能实现    

     */

    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);                //创建键盘录入对象

        String line = sc.nextLine();                        //将键盘录入的字符串存储在line中

        

        /*StringBuffer sb = new StringBuffer(line);            //将字符串转换为StringBuffer对象

        sb.reverse();                                        //将缓冲区的内容反转

        

        System.out.println(sb.toString());*/

        

        System.out.println(revString(line));

    }





    /*

     * 将字符串反转

     * 1,返回值类型String

     * 2,参数列表String line

     */

    

    public static String revString(String line) {

        StringBuffer sb = new StringBuffer(line);            //将字符串转换为StringBuffer对象

        sb.reverse();                                        //将缓冲区的内容反转

        

        return sb.toString();

    }

}