我这个程序为什么显示不出来120*10=1200呢???
import java.util.Scanner;
public class NumberMultiply {
public static void main(String[] args) {
Scanner scan = new Scanner(System.in);
System.out.println("120:");
double num1 = scan.nextDouble();
System.out.println("10:");
double num2 = scan.nextDouble();
System.out.println("----------------");
System.out.println(num1 + " X " + num2 + " = " + num1 * num2);
}