java - 分数类不能应用于给定类型？

Question

代码抛出以下错误:类 Fraction 中的方法GreatestCommonDivisor 无法应用于给定类型； 然后是

required: int,int found: no arguments reason: actual and formal argument lists differ in length

我不太确定为什么会出现错误，我尝试更改一些内容但没有成功

class Fraction{
    private int numerator;
    private int denominator;

    public Fraction(int _num1, int _num2){
        numerator = _num1;
        denominator = _num2;
    }

    public int greatestCommonDivisor(int num1, int num2){
        int greatestCommon = 1;
        for(int i = 1; i <= num1 && i <= num2; i++){
            if(num1 % i == 0 && num2 % i == 0)
            greatestCommon = i;}
            return greatestCommon;
        }
}

public class testing2
{
    public static void main(String[] arg)
    {
        Scanner in = new Scanner(System.in);

        int num11 = in.nextInt();
        int num22 = in.nextInt();

        Fraction gcd = new Fraction(num11, num22);
        System.out.println(gcd.greatestCommonDivisor());
    }
}

Answer 1

原因很简单:

你必须像这样调用方法

System.out.println(gcd.greatestCommonDivisor(num11, num22));

为什么？

因为你的方法定义为

int greatestCommonDivisor(int num1, int num2)

所以，只需传递您使用扫描仪读取的参数即可完成! :)