What is the difference between the add and offer methods in a Queue in Java?

Question

Take the PriorityQueue for example http://java.sun.com/j2se/1.5.0/docs/api/java/util/PriorityQueue.html#offer(E)

Can anyone give me an example of a Queu

Answer 1

There is no difference for the implementation of PriorityQueue.add:

public boolean add(E e) {
    return offer(e);
}

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For AbstractQueue there actually is a difference:

public boolean add(E e) {
    if (offer(e))
        return true;
    else
        throw new IllegalStateException("Queue full");
}