Getting SuperInterfaces in java
I have been trying to do this for quite some time now and can't seem to get the desired output.
What I want to do is have a class name say java.util.Vector
get the:
java.util.Vector . Any help would be appreciated.
You could do a BFS using the reflection for it.
Start with a Set<Class<?>> that contains only Vector , and iteratively increase the set with new elements using Class.getInterfaces() and Class.getSuperclass()
Add the just added elements to the Queue [which is needed for the BFS run]. Terminate when the queue is empty.
Post processing: iterate the Set - and take only objects that are interfaces using Class.isInterface()
Should look something like that:
Class<?> cl = Vector.class;
Queue<Class<?>> queue = new LinkedList<Class<?>>();
Set<Class<?>> types =new HashSet<Class<?>>();
queue.add(cl);
types.add(cl);
//BFS:
while (queue.isEmpty() == false) {
Class<?> curr = queue.poll();
Class<?>[] supers = curr.getInterfaces();
for (Class<?> next : supers) {
if (next != null && types.contains(next) == false) {
types.add(next);
queue.add(next);
}
}
Class<?> next = curr.getSuperclass();
if (next != null && types.contains(next) == false) {
queue.add(next);
types.add(next);
}
}
//post processing:
for (Class<?> curr : types) {
if (curr.isInterface()) System.out.println(curr);
}
Although java.util.Vector is not an interface, and thus you cannot extend it with an interface, what you can do is use a library like Reflections to accommodate these sorts of features. Reflections allows you to scan the classpath and query for a set of conditions like what implements or extends the given class/interface. Ive used it successfully on a couple projects where I needed to scan for interface implementations and annotated classes.
Here's the explicit link: http://code.google.com/p/reflections/
Additionally, if you are looking to just find out what class/interface a class extends/implements you can just use the class reflection api via the class attribute.
Here's some examples:
//get all public methods of Vector
Vector.class.getMethods();
//get all methods of the superclass (AbstractList) of Vector
Vector.class.getSuperclass().getMethods();
//get all interfaces implemented by Vector
Vector.class.getInterfaces();
如果你打开使用另一个库：使用apache-commons-lang
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