JAVA四舍五入问题常见报错

public class one {
    public static void main(String[] args) {
        double i = 7.4;
       int k=method(i);
        System.out.println(k);
    }

    public static double method(double num) {
        if (num * 10 % 10 >= 5) {
             num = (int) num + 1;
            System.out.println(num);
            return (int) num;
        } else {
            num = (int) num;
            System.out.println(num);
            return (int)num;
        }
    }
}

报错，一直提示该部分有问题，截图如下

把函数调用部分的public static double method(double num)修改一下即可改成

public static int method(double num)

public class one {
    public static void main(String[] args) {
        double i = 7.4;
       int k=method(i);
        System.out.println(k);
    }

    public static int method(double num) {
        if (num * 10 % 10 >= 5) {
             num =  num + 1;
            System.out.println(num);
            return (int) num;
        } else {
            System.out.println(num);
            return (int)num;
        }
    }
}