Commons Lang、StandardToStringStyle#setNullText
import org.apache.commons.lang.builder.StandardToStringStyle; public class C2009080600 { public static void main(String[] args) { StandardToStringStyle x = new StandardToStringStyle(); System.out.println(x.getNullText()); x.setNullText("***"); System.out.println(x.getNullText()); } }
で、
<null> ***