Is it possible to define multiple identical classes within one application?

In Java, it is not possible to define multiple classes with the same name and structure within the same package, as the class name combined with the package forms a unique qualified identifier. However, it is possible to define classes with the same name in different packages. This allows having multiple classes with the same structure but in different namespaces.

Example:

package com.example.first;
public class User {
    private String name;
}

package com.example.second;
public class User {
    private String name;
}

Within a single package, duplicating class names is not allowed and will result in a compilation error.