OO Factorial

Factorial.java

import lombok.AllArgsConstructor;

@SuppressWarnings("serial")
@AllArgsConstructor
public class Factorial extends Number {

	private final Integer number;
	
	@Override
	public double doubleValue() {
		return intValue();
	}

	@Override
	public float floatValue() {
		return intValue();
	}

	@Override
	public int intValue() {
		if (this.number == 0)
			return 1;
		return this.number * new Factorial(this.number - 1).intValue();
	}

	@Override
	public long longValue() {
		return intValue();
	}
	
	@Override
	public String toString() {
		return Integer.toString(intValue());
	}

	public static void main(String[] args) {
		
		System.out.println(new Factorial(5));
		
	}
	
}