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CJHam
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Small mistake in "Figure 7. A component node adapter.".
Mistake is in the far right side Post It Note, where it says:
"
public boolean isLeaf() {
return component.getComponentCount() > 0;
}
"
This is wrong. You can see that isLeaf() wouldn't return true when it really was a leaf.
Checking the article confirms this: the author's Java code is correct, but his UML class model is an accidental fudge of these two methods from the Java code:
public boolean isLeaf() {
return !isContainer();
}
public boolean isContainer() {
return getComponent().getComponentCount() > 0;
}
Great article though. Nice practical example of Adapter. In general, excellent UML use. 
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