Strongly Typed Identifier using ULID Creator

Id.java

package com.example.idapi;

import java.util.Objects;

import com.github.f4b6a3.ulid.Ulid;
import com.github.f4b6a3.ulid.UlidCreator;

public abstract class Id<T extends Id<T>> implements Comparable<T> {

	protected final Ulid value;

	public Id() {
		this.value = UlidCreator.getMonotonicUlid();
	}

	public Id(Ulid value) {
		Objects.requireNonNull(value);
		this.value = value;
	}

	public Id(String string) {
		Objects.requireNonNull(string);
		this.value = Ulid.from(string);
	}

	public Ulid toUlid() {
		return this.value;
	}

	@Override
	public int hashCode() {
		return this.value.hashCode();
	}

	@Override
	@SuppressWarnings("unchecked")
	public boolean equals(Object other) {
		if (other == null)
			return false;
		if (other.getClass() != getClass())
			return false;
		return this.value.equals(((T) other).value);
	}

	@Override
	public int compareTo(T other) {
		return this.value.compareTo(other.value);
	}

	@Override
	public String toString() {
		return String.format("%s{value=%s}", getClass().getSimpleName(), value);
	}
}

UserId.java

package com.example;

import com.github.f4b6a3.ulid.Ulid;

public final class UserId extends Id<UserId> {

	public UserId() {
		super();
	}

	public UserId(Ulid value) {
		super(value);
	}

	public UserId(String string) {
		super(string);
	}

	public static UserId of(Ulid value) {
		return new UserId(value);
	}

	public static UserId of(String string) {
		return new UserId(string);
	}
}