Commons Lang、StandardToStringStyle#setArrayContentDetail

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

public class C2009072600 {
    public static void main(String[] args) {
        StandardToStringStyle x = new StandardToStringStyle();

        System.out.println(x.isArrayContentDetail());

        x.setArrayContentDetail(false);
        System.out.println(x.isArrayContentDetail());
    }
}

で、

true
false