Hello. I'm trying to solve the following problem.

I have 4 interfaces that are in a diamond shape and 2 classes.

The requirements is to make the method calls work, while keeping f1 as the interface of x.

Can you guys give me a hand?

package lab4;

public class Prob6 {

    public static void main(String[] args) {
        f1 x = new object();
        x.method1();
        x.method2();
        x.method3();
        x.method4();
    }

}

interface f1{
    void method1();
}

interface f2 extends f1{
    void method2();
}

interface f3 extends f1{
    void method3();
}

interface f4 extends f2,f3{
    void method4();
}

class object implements f4{
    
    public void method1() 
    {
        System.out.println("method 1");
    }
    public void method2() 
    {
        System.out.println("method 2");
    }
    public void method3() 
    {
        System.out.println("method 3");
    }
    public void method4() 
    {
        System.out.println("method 4");
    }
}