for迴圈倒著用  就可以實現字串的反轉

package com.heima.test;

import java.util.Scanner;

/**
 * 字串反轉 輸入abc 輸出cba
 * 
 * @author fenuang
 *
 */
public class zifuchuanfanzhuan {

	public static void main(String[] args) {
		// TODO Auto-generated method stub

		Scanner sc = new Scanner(System.in);
		System.out.println("請輸入一個字元竄");
		
		String arr= sc.nextLine();
		char[] arr1 = arr.toCharArray();
		String arr2 = "";
		for (int i = arr1.length-1; i >= 0 ; i--) {
			arr2 = arr2 + arr1[i];
		}
		System.out.println(arr2);
		
	}

}