Question

What I want is actually something like this:

public class Foo<T> {
    // ...
}

public class Foo<T, S> {
    // ...
}

Note that the name of the classes are the same, but the length of type list is different. The code above doesn’t work in Java, but I hope it shows my intent. Is it possible to do similar thing in Java?

Example:

public class Foo<T> {
    public Integer call(T input) {
        // ...
    }
}

public class Foo<T， S> {
    public S call(T input) {
        // ...
    }
}

Answer 1

You don’t override classes, you override methods. Classes might be subclassed.

This is possible:

public class Zoo<T, S, U> extends Foo<T>
{
    // ...
}