我被这个计算器程序困住了，我没有得到正确的答案。

我的编程课程希望我有这样的结局：

• 输入第一个数字！
• 9
• 输入第二个数字！
• 5
• 9 + 5 = 14
• 9-5 = 4
• 9 * 5 = 45
• 9/5 = 1.8，这就是问题所在，我编写的程序仅给我1.0的答案。我怎样才能使这个数字是1.8而不是1.0？

public class Nelilaskin {

    public static void main(String[] args) {
        Scanner reader = new Scanner(System.in);


        System.out.println("Enter the first number!");
        int first = Integer.valueOf(reader.nextLine());
        System.out.println("Enter the second number!");
        int second = Integer.valueOf(reader.nextLine());
        int plus = (first + second);
        int minus = (first - second);
        int multi = (first * second);
        double division = (first / second * 1.0);

        System.out.println(first + " + " + second + " = " + plus);
        System.out.println(first + " - " + second + " = " + minus);
        System.out.println(first + " * " + second + " = " + multi);
        System.out.println(first + " / " + second + " = " + division);


    }

}

问题来源：Stack Overflow