本帖最后由 林林鸦 于 2014-4-7 10:48 编辑
- import java.util.*;
- public class CountingIntegerList extends AbstractList<Integer> {
- private int size;
- public CountingIntegerList(int size) {
- this.size = size < 0 ? 0 : size;
- }
-
- public Integer get(int index) {
- return Integer.valueOf(index);
- }
- public int size() {
- return size;
- }
- public static void main(String[] args) {
- System.out.println(new CountingIntegerList(30));
- }
- } /*
- * 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]
- */
复制代码 为什么会产生上面的输出结果 |
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