Java中使用Arrays.asList初始化ArrayList 

package xiaoling;
import java.util.Arrays;
import java.util.ArrayList;
import java.util.List;
public class ListTest{
        public static void main(String[] args){
                List<List<Integer>> list = new ArrayList<>();
                for (int num=0; num<10; ++num){
                        list.add(new ArrayList(Arrays.asList(num, num+1)));
                }
                System.out.println(list);
        }
}

 运行结果为：[[0, 1], [1, 2], [2, 3], [3, 4], [4, 5], [5, 6], [6, 7], [7, 8], [8, 9], [9, 10]]

数组测试：

 1 package xiaoling;
 2 import java.util.Arrays;
 3 import java.util.ArrayList;
 4 import java.util.List;
 5 public class ListTest{
 6     public static void main(String[] args){
 7         List<List<Integer>> list = new ArrayList<>();
 8         for (int num=0; num<5; ++num){
 9             list.add(new ArrayList(Arrays.asList(num, num+1)));
10         }
11         System.out.println(list);
12 
13         int[] nums = new int[]{11, 12, 13, 14, 15};
14         list.add(new ArrayList(Arrays.asList(nums)));
15         System.out.println(list);
16 
17         Integer[] nums1 = new Integer[]{11, 12, 13, 14, 15};
18         list.add(new ArrayList(Arrays.asList(nums1)));
19         System.out.println(list);
20     }
21 }

[[0, 1], [1, 2], [2, 3], [3, 4], [4, 5]]
[[0, 1], [1, 2], [2, 3], [3, 4], [4, 5], [[I@4defb0be]]
[[0, 1], [1, 2], [2, 3], [3, 4], [4, 5], [[I@4defb0be], [11, 12, 13, 14, 15]]

 

posted on 2019-10-13 14:39  wangling1820  阅读(1140)  评论(0)  编辑  收藏  举报

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