how to fix

Question

interface Animal {
public void eat();
}
Cat implements {
public eat() {
System.out.println("Cat eats");
}
}

Answer 1

it's better to use inheritance than an interface , always think to abstract your code
https://code.sololearn.com/cmgdrE2k797U/?ref=app

Answer 2

Cat implements Animal
In your Cat class add void to the eat method
And in your main method:
Cat c = new Cat();
c.eat();

Answer 3

interface Animal {
public void eat();
}
class Cat implements Animal {
public void eat() {
System.out.println("Cat eats");
}
}

Answer 4

Class, Animal, Void