Why can foreach take an instance of a class that has an iterator method?

Question

Java

As I understand it, foreach understands the Iterable interface as an array, but why do we need only an instance of the class?

for (String j: new Iterabled()) {
            System.out.println(j);
        }

class Iterabled extends Pets implements Iterable<String>{

    public int size(){
        return names.length;
    }

    @Override
    public Iterator<String> iterator(){
        return new Iterator<String>() {
            private int index = 0;
            @Override
            public boolean hasNext() {
                return index < size();
            }
            @Override
            public String next() {
                index = index + 1;
                return names[index];
            }
        };
    }

Answer 1

He understands Iterable not as an array, but as something that can be iterated over. How to enumerate what is inside. For this, an Iterator is returned.