Commons Lang、StandardToStringStyle#setUseFieldNames

import org.apache.commons.lang.builder.StandardToStringStyle;

public class C2009081200 {
    public static void main(String[] args) {
        StandardToStringStyle x = new StandardToStringStyle();
        System.out.println(x.isUseFieldNames());

        x.setUseFieldNames(false);
        System.out.println(x.isUseFieldNames());
    }
}

で、

true
false