Editing Java syntax (section)

===Generic interfaces===
Interfaces can be parameterized in the similar manner as the classes.

<syntaxhighlight lang="java">
interface Expandable<T extends Number> {
    void addItem(T item);
}

// This class is parameterized
class Array<T extends Number> implements Expandable<T> {
    void addItem(T item) {
    }
}

// And this is not and uses an explicit type instead
class IntegerArray implements Expandable<Integer> {
    void addItem(Integer item) {
    }
}
</syntaxhighlight>