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Java 实现迭代器接口
实现迭代器接口
实例源码：
源代码：
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public class DataStructure {3
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// Create an array6
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private final static int SIZE = 15;/** 来 自 时 代 J a v a - N o w J a v a . c o m**/8
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private int[] arrayOfInts = new int[SIZE];10
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public DataStructure() {13
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// fill the array with ascending integer values15
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for (int i = 0; i < SIZE; i++) {17
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arrayOfInts[i] = i;19
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}21
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}23
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public void printEven() {26
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// Print out values of even indices of the array29
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DataStructureIterator iterator = this.new EvenIterator();31
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来自 时 代 J a v a 公 众 号 - nowjava.com**/33
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while (iterator.hasNext()) {35
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System.out.print(iterator.next() + " ");37
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}39
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System.out.println();41
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}43
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interface DataStructureIterator extends java.util.Iterator<Integer> {46
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}48
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// Inner class implements the DataStructureIterator interface,51
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// which extends the Iterator<Integer> interface53
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private class EvenIterator implements DataStructureIterator {56
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// Start stepping through the array from the beginning59
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private int nextIndex = 0;61
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public boolean hasNext() {64
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// Check if the current element is the last in the array67
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return (nextIndex <= SIZE - 1);69
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}71
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public Integer next() {74
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// Record a value of an even index of the array77
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Integer retValue = Integer.valueOf(arrayOfInts[nextIndex]);79
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// Get the next even element82
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nextIndex += 2;84
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return retValue;86
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}88
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}90
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public static void main(String s[]) {93
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// Fill the array with integer values and print out only96
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// values of even indices98
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DataStructure ds = new DataStructure();100
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ds.printEven();102
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}104
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}106
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/*109
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* Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.111
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*113
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* Redistribution and use in source and binary forms, with or without115
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* modification, are permitted provided that the following conditions117
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* are met:119
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*121
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* - Redistributions of source code must retain the above copyright123
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* notice, this list of conditions and the following disclaimer.125
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*127
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* - Redistributions in binary form must reproduce the above copyright129
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* notice, this list of conditions and the following disclaimer in the131
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* documentation and/or other materials provided with the distribution.133
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*135
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* - Neither the name of Oracle or the names of its137
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* contributors may be used to endorse or promote products derived139
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* from this software without specific prior written permission.141
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*143
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS145
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* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,147
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR149
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