JAVA基础（String类字符串反转）

1， 需求：把字符串反转

• 举例：键盘录入"abc"        

• 输出结果："cba"

import java.util.Scanner;





public class Test6 {





    /**

     * * 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"

        *分析:

        *1,通过键盘录入获取字符串Scanner

        *2,将字符串转换成字符数组

        *3,倒着遍历字符数组,并再次拼接成字符串

        *4,打印

     */

    public static void main(String[] args) {

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

        System.out.println("请输入一个字符串:");

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

        

        char[] arr = line.toCharArray();                    //将字符串转换为字符数组

        

        String s = "";

        for(int i = arr.length-1; i >= 0; i--) {            //倒着遍历字符数组

            s = s + arr[i];                                    //拼接成字符串

        }

        

        System.out.println(s);

    }





}