郭怡吟Java套件Scanner，方法length()charAt()

Java程式碼

import java.util.Scanner; /*開啟套件package util=utility用途,Scanner掃描器*/
/*郭怡吟utility industry=公用事業產業,電力,自來水,效用=utility */
class MyClass {
  public static void main(String[] args) {
    String a, b="";                         /*定義字串a,b*/
    Scanner myObj = new Scanner(System.in); //建構編輯物件
    System.out.print("輸入: ");
    a = myObj.nextLine();                      /*輸入文字nextLine到變數a */
    System.out.println("長度: " + a.length());/*輸出字串長度length()*/
    for (int i = 0; i < a.length(); i++)      /*迴圈 */
        b = a.charAt(i) + b;                  /*a字元順序放到b前面*/
      System.out.println("輸出: "+ b);
    }
}