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affordable private java development affordable private java development MainFlow_wide @media print } h3, h4, h5 #ToggleLeft /t function leftBar() The interface does about what you'd expect given that a Collection represents a group of objects. The interface has methods to tell you how many elements are in the collection (size, isEmpty), to check whether a given object is in the collection (contains), to add and remove an element from the collection (add, remove), and to provide an iterator over the collection (iterator). The add method is defined generally enough so that it makes sense for collections that allow duplicates as well as those that don't. It guarantees that the Collection will contain the specified element after the call completes, and returns true if the Collection changes as a result of the call. Similarly, the remove method is designed to remove a single instance of the specified element from the Collection, assuming that it contains the element to start with, and to return true if the Collection was modified as a result.

affordable private java development Traversing Collections There are two ways to traverse collections: (1) with the for-each construct and (2) by using Iterators.for-each Construct The for-each construct allows you to concisely traverse a collection or array using a for loop — see The for Statement.The following code uses the for-each construct to print out each element of a collection on a separate line. for (Object o : collection) System.out.

affordable private java development println(o); Iterators An Iterator is an object that enables you to traverse through a collection and to remove elements from the collection selectively, if desired. You get an Iterator for a collection by calling its iterator method. The following is the Iterator interface. public interface Iterator<E> The hasNext method returns true if the iteration has more elements, and the next method returns the next element in the iteration. The remove method removes the last element that was returned by next from the underlying Collection.

affordable private java development The remove method may be called only once per call to next and throws an exception if this rule is violated. Note that Iterator.remove is the only safe way to modify a collection during iteration; the behavior is unspecified if the underlying collection is modified in any other way while the iteration is in progress. Use Iterator instead of the for-each construct when you need to: Remove the current element. The for-each construct hides the iterator, so you cannot call remove.

affordable private java development

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affordable private java development