Commons Lang、Fraction.getFraction()

import org.apache.commons.lang.math.Fraction;

public class C2009022000 {
    public static void main(String[] args) {
        System.out.println(Fraction.getFraction(1));
        System.out.println(Fraction.getFraction(1.0));
        System.out.println(Fraction.getFraction(1.2));
        System.out.println(Fraction.getFraction(1.3));
        System.out.println(Fraction.getFraction(0));

        System.out.println(Fraction.getFraction(1, 2));
        System.out.println(Fraction.getFraction(2, 3));

        System.out.println(Fraction.getFraction(1, 2, 3));
        System.out.println(Fraction.getFraction(2, 2, 3));

        System.out.println(Fraction.getFraction("1"));
        System.out.println(Fraction.getFraction("1.2"));
        System.out.println(Fraction.getFraction("1/2"));
        System.out.println(Fraction.getFraction("1 1/2"));
        System.out.println(Fraction.getFraction("2 1/2"));
    }
}

で、

1/1
1/1
6/5
13/10
0/1
1/2
2/3
5/3
8/3
1/1
6/5
1/2
3/2
5/2

「Fraction.getFraction("2 1/2")」で、スペースが複数だとダメみたい