Comparing equals between 1D and 2D array in java

Question

I have two questions: I am using JAVA programming language and I have found some difficulties using Arrays.

Here are some different arrays :

Object [] play1 = {0,3,6};
Object [] play2 = {0,3,6,4};
Object[][] pre = {{0,1,2},{0,3,6},{2,5,8},{6,7,8},{0,4,8},{2,4,6}};

Question 1 : Is it possible to check equals between play1 and pre using deepEquals? I also know that pre is 2D array and play1 is 1D array. If I want to check whether play1 is equal to pre, then I might check like:

if(Arrays.deepEquals(pre, play1)){
    System.out.print("true");
    }else{System.out.print("false");}

Is the code correct? Even though is is possible to check equals between 1D and 2D arrays? Or do I have to use ArrayList? I am not that much familiar with ArrayList. Would appreciate if anyone explain with example.

Question 2 : However, if I want to check between play1 and play2, then also the output is false. I want to check between two arrays even though they don't have equal element but if both array consists the same element such as: {0,3,6} can be found in both play1 and play2, then the output must come true..

Thanks.

Answer 1

For Question2:

You can create List of objects and check as follows:

    List<Object> play1List = Arrays.asList(play1);
    List<Object> play2List = Arrays.asList(play2);
    if(play1List.containsAll(play2List) || play2List.containsAll(play1List))
        System.out.println("founD");

For Question1:

    List<Object> play1List = Arrays.asList(play1);
    for (int i =0 ; i< pre.length;i++){
        List<Object> preList = Arrays.asList(pre[i]);
        if(preList.equals(play1List)){
            System.out.println("FounD"+preList);
            break;
        }    
    }

Answer 2

From the API docs:

Two array references are considered deeply equal if both are null, or if they refer to arrays that contain the same number of elements and all corresponding pairs of elements in the two arrays are deeply equal.

From your question I understand that you are searching for a subgroup of the array.

I don't think that there's a function for that on the JDK, probably you have to develop your own function iterating the arrays.