Commons Lang、BooleanUtils.toString()

import org.apache.commons.lang.BooleanUtils;

public class C2009032800 {
    public static void main(String[] args) {
        System.out.println(BooleanUtils.toString(true,  "foo", "bar"));
        System.out.println(BooleanUtils.toString(false, "foo", "bar"));
        System.out.println(BooleanUtils.toString(new Boolean(true),  "foo", "bar"));
        System.out.println(BooleanUtils.toString(new Boolean(false), "foo", "bar"));
    }
}

で、

foo
bar
foo
bar