Valid JavaBeans names for boolean getter methods
Solution 1:
According to the JavaBeans specification section 8.3.2:
Boolean properties
In addition, for boolean properties, we allow a getter method to match the pattern:
public boolean is<PropertyName>();
This "
isPropertyName
" method may be provided instead of a "get<PropertyName>
" method, or it may be provided in addition to a "get<PropertyName>
" method. In either case, if theis<PropertyName>
method is present for a boolean property then we will use the "is<PropertyName>
" method to read the property value. An example boolean property might be:public boolean isMarsupial(); public void setMarsupial(boolean m);
In other words, unless something has changed since then, has
isn't a valid prefix I'm afraid :(
It's possible that some tools and libraries will recognise such properties anyway, but it's not a good idea to rely on it.
Solution 2:
Jon Skeet noted that according to the specification it is not valid. Also, canX
, shouldX
, and the likes are not valid. Which is rather unfortunate. Here is a way to check whether a given property has a valid getter:
BeanInfo info = Introspector.getBeanInfo(Item.class);
Item itm = new Item();
for (PropertyDescriptor pd : info.getPropertyDescriptors()) {
System.out.println(pd.getName() + " : " + pd.getReadMethod());
}
The class Item
should be a javabean with a foo property, and a getter. If the read method is null
, it means there is no valid getter defined according to the javabeans spec.
Solution 3:
This is somewhat subjective, but yes, I would say "has" is a perfectly valid prefix for a Boolean property.
edit the question, as asked, did not mention the javabeans specification and so my answer did not address that aspect of the question. Hence the answer above.