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The Java Developers Almanac 1.4Order this book from Amazon. |
e345. Listing the Elements of a CollectionThis example demonstrates how to iterate over the elements of various types of collections.// For a set or list for (Iterator it=collection.iterator(); it.hasNext(); ) { Object element = it.next(); } // For keys of a map for (Iterator it=map.keySet().iterator(); it.hasNext(); ) { Object key = it.next(); } // For values of a map for (Iterator it=map.values().iterator(); it.hasNext(); ) { Object value = it.next(); } // For both the keys and values of a map for (Iterator it=map.entrySet().iterator(); it.hasNext(); ) { Map.Entry entry = (Map.Entry)it.next(); Object key = entry.getKey(); Object value = entry.getValue(); }
e343. Implementing a Stack e344. Implementing a Least-Recently-Used (LRU) Cache e346. Storing Primitive Types in a Collection e347. Creating a Copy of a Collection e348. Making a Collection Read-Only
© 2002 Addison-Wesley. |