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Java 实现迭代器接口

欢马劈雪

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实现迭代器接口

实例源码：

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public class DataStructure {

// Create an array

private final static int SIZE = 15;/** 来 自 时 代 J a v a - N o w J a v a . c o m**/

private int[] arrayOfInts = new int[SIZE];

public DataStructure() {

// fill the array with ascending integer values

for (int i = 0; i < SIZE; i++) {

arrayOfInts[i] = i;

}

public void printEven() {

// Print out values of even indices of the array

DataStructureIterator iterator = this.new EvenIterator();
        /** 
         来自 时 代 J a v a 公 众 号 - nowjava.com**/

while (iterator.hasNext()) {

System.out.print(iterator.next() + " ");

}

System.out.println();

}

interface DataStructureIterator extends java.util.Iterator<Integer> {

}

// Inner class implements the DataStructureIterator interface,

// which extends the Iterator<Integer> interface

private class EvenIterator implements DataStructureIterator {

// Start stepping through the array from the beginning

private int nextIndex = 0;

public boolean hasNext() {

// Check if the current element is the last in the array

return (nextIndex <= SIZE - 1);

}

public Integer next() {

// Record a value of an even index of the array

Integer retValue = Integer.valueOf(arrayOfInts[nextIndex]);

// Get the next even element

nextIndex += 2;

return retValue;

}

public static void main(String s[]) {

// Fill the array with integer values and print out only

// values of even indices

DataStructure ds = new DataStructure();

ds.printEven();

}

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* are met:

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*     contributors may be used to endorse or promote products derived

*     from this software without specific prior written permission.

* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS

* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,

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编辑于 2020-03-26 09:23:272020-03-26 09:23:27

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