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CountingIntegerList.java
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32 lines (31 loc) · 946 Bytes
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// onjava/CountingIntegerList.java
// (c)2021 MindView LLC: see Copyright.txt
// 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
*/