HashSet使用int数组(HashSet usage with int arrays)

 因为我有一个包含重复项的int数组的ArrayList，所以我想使用HashSet。 不幸的是，我无法像我所希望的那样设法使用HashSet： 
 
System.out.print("\nTESTs\n");
    ArrayList<int[]> list = new ArrayList<int[]>();
    list.add(new int[]{1,2,3});
    list.add(new int[]{5,1,1});
    list.add(new int[]{1,2,3});//duplicate
    list.add(new int[]{5,1,3});

    Set<int[]> set = new HashSet<int[]>(list);
    System.out.println("Size of the set = "+set.size());

    ArrayList<int[]> arrayList = new ArrayList<int[]>(set);
    System.out.println("Size of the arrayList = "+arrayList.size());

    for (int[] array:arrayList){
        System.out.println(Arrays.toString(array));
    }
 
 它导致： 
 
Size of the set = 4
Size of the arrayList = 4
[1, 2, 3]
[1, 2, 3] // duplicate still here
[5, 1, 1]
[5, 1, 3]
 
 有人可以告诉我我错了吗？ 
 
 在此先感谢多米尼克（java新手） 

As I have an ArrayList of int arrays which contains duplicates, I'd like to use HashSet. Unfortunately, I can't manage to use HashSet as I wish:
 
System.out.print("\nTESTs\n");
    ArrayList<int[]> list = new ArrayList<int[]>();
    list.add(new int[]{1,2,3});
    list.add(new int[]{5,1,1});
    list.add(new int[]{1,2,3});//duplicate
    list.add(new int[]{5,1,3});

    Set<int[]> set = new HashSet<int[]>(list);
    System.out.println("Size of the set = "+set.size());

    ArrayList<int[]> arrayList = new ArrayList<int[]>(set);
    System.out.println("Size of the arrayList = "+arrayList.size());

    for (int[] array:arrayList){
        System.out.println(Arrays.toString(array));
    }
 
It results in:
 
Size of the set = 4
Size of the arrayList = 4
[1, 2, 3]
[1, 2, 3] // duplicate still here
[5, 1, 1]
[5, 1, 3]
 
Could anybody tell me where I'm wrong ?
 
Thanks in advance Dominique (java newbie)

原文：https://stackoverflow.com/questions/28344312