Source Code Cross Referenced for Queue.java in  » Apache-Harmony-Java-SE » java-package » java » util » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Apache Harmony Java SE » java package » java.util 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        /*
02:         *  Licensed to the Apache Software Foundation (ASF) under one or more
03:         *  contributor license agreements.  See the NOTICE file distributed with
04:         *  this work for additional information regarding copyright ownership.
05:         *  The ASF licenses this file to You under the Apache License, Version 2.0
06:         *  (the "License"); you may not use this file except in compliance with
07:         *  the License.  You may obtain a copy of the License at
08:         *
09:         *     http://www.apache.org/licenses/LICENSE-2.0
10:         *
11:         *  Unless required by applicable law or agreed to in writing, software
12:         *  distributed under the License is distributed on an "AS IS" BASIS,
13:         *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14:         *  See the License for the specific language governing permissions and
15:         *  limitations under the License.
16:         */
17:        package java.util;
18:
19:        /**
20:         * A kind of collection provides advanced operations than other basic
21:         * collections, such as insertion, extraction, and inspection.
22:         * 
23:         * Generally, a queue orders its elements by means of first-in-first-out. While
24:         * priority queue orders its elements according to a comparator specified or the
25:         * elements' natural order. Furthermore, a stack orders its elements
26:         * last-in-first out.
27:         * 
28:         * A typical queue does not allow null to be inserted as its element, while some
29:         * implementations such as LinkedList allow it. But null should not be inserted
30:         * even in these implementations, since method poll return null to indicate that
31:         * there is no element left in the queue.
32:         * 
33:         * Queue does not provide blocking queue methods, which will block until the
34:         * operation of the method is allowed. BlockingQueue interface defines such
35:         * methods.
36:         */
37:        public interface Queue<E> extends Collection<E> {
38:
39:            /**
40:             * Inserts the specified element into the queue provided that the condition
41:             * allows such an operation. The method is generally preferable to the
42:             * collection.add(E), since the latter might throw an exception if the
43:             * operation fails.
44:             * 
45:             * @param o
46:             *            the specified element to insert into the queue.
47:             * @return true if the operation succeeds and false if it fails.
48:             */
49:            public boolean offer(E o);
50:
51:            /**
52:             * Gets and removes the element in the head of the queue, or returns null if
53:             * there is no element in the queue.
54:             * 
55:             * @return the element in the head of the queue or null if there is no
56:             *         element in the queue.
57:             */
58:            public E poll();
59:
60:            /**
61:             * Gets and removes the element in the head of the queue. Throws a
62:             * NoSuchElementException if there is no element in the queue.
63:             * 
64:             * @return the element in the head of the queue.
65:             * @throws NoSuchElementException
66:             *             if there is no element in the queue.
67:             */
68:            public E remove();
69:
70:            /**
71:             * Gets but not removes the element in the head of the queue, or throws
72:             * exception if there is no element in the queue.
73:             * 
74:             * @return the element in the head of the queue or null if there is no
75:             *         element in the queue.
76:             */
77:            public E peek();
78:
79:            /**
80:             * Gets but not removes the element in the head of the queue. Throws a
81:             * NoSuchElementException if there is no element in the queue.
82:             * 
83:             * @return the element in the head of the queue.
84:             * @throws NoSuchElementException
85:             *             if there is no element in the queue.
86:             */
87:            public E element();
88:
89:        }
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