Code documentation - Software Development Case Studies in Java - page 175

public boolean isComposite() { return true; }
public Element firstChild() { return child; }
public void addChild(Element newChild) {
if (child ## null )
child # newChild;
else {
Element currentChild;
currentChild # child;
while (currentChild.hasNext())
currentChild # currentChild.nextSibling();
currentChild.addSibling(newChild);
}
}
public String getClosingTag() { return "</" ! tag ! ">"; }
public void serialize(PrintWriter os){
os.print(getOpeningTag());
Element currentChild;
CurrentChild # firstChild();
while (currentChild! # null ){
currentChild.serialize(os);
currentChild # currentChild.nextSibling();
}
os.println(getClosingTag());
}
}
The remaining classes extend either Element or Component . They repre-
sent concrete elements that appear in HTML pages.
public class Br extends Element {
public Br(){
super ( null , "BR"); }
}
public class Link extends Composite {
public Link(String href){
super (href,"A");
}
public String getOpeningTag() {
return "<" ! tag ! " href # \"" ! info ! "\" >"; }
}
public class Ul extends Composite {
public Ul(){
super ( null ,"UL");
}
}
public class Head extends Element {
public Head(String title){
super (title, "HEAD");
}