ScannerDemo2.java

import java.util.Scanner;

public class ScannerDemo2 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.print("請輸入一個數字： ");
        System.out.printf("您輸入了 %d ！\n", 
                           scanner.nextInt());
    }
}