判斷是不是回文數

12321 1221

    public static void PJ() {
        Scanner sc = new Scanner(System.in);
        System.out.println("請輸入一個整數:");
        int num = sc.nextInt();
        String s = num+"";
        String s1 ="";
        for (int i = s.length()-1; i>=0; i--) {
            s1+=s.charAt(i);
        }
        if (s.equals(s1)) {
            System.out.println("是回文數");
        }else {
            System.out.println("不是回文數");
        }
    }
 

生成回文數

    public static void generate() {
        Scanner sc = new Scanner(System.in);
        System.out.println("請輸入一個整數:");
        int num = sc.nextInt();
        String s = num+"";
        String s1="";
        for (int i = s.length()-1; i>=0; i--) {
            s1+=s.charAt(i);
        }
        System.out.println("它的回文數是"+s1);
    }
    
 

回文數的判斷與生成