OnJava8-Examples/onjava/CountingIntegerList.java at master · xinan-w/OnJava8-Examples · GitHub

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// onjava/CountingIntegerList.java

// We make no guarantees that this code is fit for any purpose.

// Visit http://OnJava8.com for more book information.

// List of any length, containing sample data

// {java onjava.CountingIntegerList}

package onjava;

import java.util.*;

public class CountingIntegerList

extends AbstractList<Integer> {

private int size;

public CountingIntegerList() { size = 0; }

public CountingIntegerList(int size) {

this.size = size < 0 ? 0 : size;

}

@Override public Integer get(int index) {

return index;

}

@Override public int size() { return size; }

public static void main(String[] args) {

List<Integer> cil =

new CountingIntegerList(30);

System.out.println(cil);

System.out.println(cil.get(500));

}

/* Output:

[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,

16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29]

500

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