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affordable private java application affordable private java application . synchronized(m) One minor downside of using wrapper implementations is that you do not have the ability to execute any noninterface operations of a wrapped implementation. So, for instance, in the preceding List example, you cannot call ArrayList'sensureCapacity operation on the wrapped ArrayList.Unmodifiable WrappersUnlike synchronization wrappers, which add functionality to the wrapped collection, the unmodifiable wrappers take functionality away. In particular, they take away the ability to modify the collection by intercepting all the operations that would modify the collection and throwing an UnsupportedOperationException.

affordable private java application Unmodifiable wrappers have two main uses, as follows: To make a collection immutable once it has been built. In this case, it's good practice not to maintain a reference to the backing collection. This absolutely guarantees immutability. To allow certain clients read-only access to your data structures. You keep a reference to the backing collection but hand out a reference to the wrapper.

affordable private java application In this way, clients can look but not modify, while you maintain full access.Like synchronization wrappers, each of the six core Collection interfaces has one static factory method. public static <T> Collection<T> unmodifiableCollection(Collection<? extends T> c); public static <T> Set<T> unmodifiableSet(Set<? extends T> s); public static <T> List<T> unmodifiableList(List<? extends T> list); public static <K,V> Map<K, V> unmodifiableMap(Map<? extends K, ? extends V> m); public static <T> SortedSet<T> unmodifiableSortedSet(SortedSet<? extends T> s); public static <K,V> SortedMap<K, V> unmodifiableSortedMap(SortedMap<K, ? extends V> m); Checked Interface WrappersThe Collections.checked interface wrappers are provided for use with generic collections. These implementations return a dynamically type-safe view of the specified collection, which throws a ClassCastException if a client attempts to add an element of the wrong type.

affordable private java application The generics mechanism in the language provides compile-time (static) type-checking, but it is possible to defeat this mechanism. Dynamically type-safe views eliminate this possibility entirely. « Previous • Trail • Next » Problems with the examples? Try Compiling and Running the Examples: FAQs. Complaints? Compliments? Suggestions? Give us your feedback. Copyright 1995-2007 Sun Microsystems, Inc.

affordable private java application

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affordable private java application