java - 在 Main 中调用静态方法

Question

如何在 main 中调用此类的最后一个方法？我只是想返回一个包含两个参数乘积的新 Rational 对象。每次我尝试在 main 中调用它时，我都不能在参数中使用整数，因为它只接受对象。那么如果它只接受对象，我如何将两个数字相乘。（我不能将参数更改为整数，这是问题集的一部分）。您的帮助将不胜感激。这是我的代码：

 public class Rational {
        private int numer, denom;


        public Rational(int numer, int denom){
            this.numer = numer;
            this.denom = denom;


        }

        public Rational(Rational rational){
            rational = new Rational(numer, denom);


        }

        public void setNumber(int fum){
            numer = fum;
        }

        public int getNumber(){
            return numer;
        }

        public void setDenom(int Dum){
            denom = Dum;
        }

        public int getDenom(){
            return denom;
        }

        public Rational reciprocal(){
            System.out.println(denom + "/" + numer);
            return new Rational(denom, numer);
        }

        public static Rational multiply(Rational a, Rational b){
            int bar = a.numer;
            int bla = b.denom;
            int multi = bar * bla;
            System.out.println(multi);
            return new Rational(bar,bla);
        }

    }

Answer 1

你可以这样称呼它：

public class Main {
    public static void main(String[] args) {
        Rational rational1 = new Rational(1,2);
        Rational rational2 = new Rational(1,2);
        Rational result = Rational.multiply(rational1, rational2);
    }
}