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  • Appending / adding to a 2D array?


    JAG98
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    int[ ][ ] myArr1 = {{1,2},{3,4},{5,6}};

    How do I get myArr2 from myArr1 such that it contains all the elements of the first array with an added element {7,8}? Position of the last element doesn't matter.

    int[ ][ ] myArr2 = myArr1.push({7,8}) doesn't seem to work.

    'cannot resolve symbol push' is the error that pops up

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    int[ ][ ] myArr1 = {
                    {1,2},
                    {3,4},
                    {5,6}
            }; //This array is bound to a size of 3 so you cant add to it
    
    		//Create new array with +1 size for our new element
            int [][] myArry2 = new int[myArr1.length+1][myArr1.length+1];
    
    
    		//Add in our old elements from the old array
            for (int i = 0; i<myArr1.length; i++) {
                myArry2[i][0] =myArr1[i][0];
                myArry2[i][1] =myArr1[i][1];
            }
    
            //Add in our new entry                        
            myArry2[myArr1.length][0] = 7;
            myArry2[myArr1.length][1] = 8;
    
            //Print out the result list
            System.out.println("myArr2: ");
            for (int i = 0; i<myArry2.length; i++) {
                System.out.println(myArry2[i][0] + " - " + myArry2[i][1]);
            }
        }

     

    Probs can be done in a nicer way but should get you on your way at least.

     

     

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    1 hour ago, TheCloakdOne said:
    int[ ][ ] myArr1 = {
                    {1,2},
                    {3,4},
                    {5,6}
            }; //This array is bound to a size of 3 so you cant add to it
    
    		//Create new array with +1 size for our new element
            int [][] myArry2 = new int[myArr1.length+1][myArr1.length+1];
    
    
    		//Add in our old elements from the old array
            for (int i = 0; i<myArr1.length; i++) {
                myArry2[i][0] =myArr1[i][0];
                myArry2[i][1] =myArr1[i][1];
            }
    
            //Add in our new entry                        
            myArry2[myArr1.length][0] = 7;
            myArry2[myArr1.length][1] = 8;
    
            //Print out the result list
            System.out.println("myArr2: ");
            for (int i = 0; i<myArry2.length; i++) {
                System.out.println(myArry2[i][0] + " - " + myArry2[i][1]);
            }
        }

     

    Probs can be done in a nicer way but should get you on your way at least.

     

     

    Yep tried this. Too cumbersome and lengthy if one might say so. Deciding to stick to the Arraylist method for now. Converting to Arraylist, then adding and converting back. If nothing else, helps avoid the for loop hassles. Thanks for the suggestion though!

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    You can use System#arraycopy
     

    public static int[][] append(int[][] matrix, int[][] suffix){
      int[][] result = Arrays.copyOf(matrix, matrix.length + suffix.length);
      System.arraycopy(suffix, 0, result, matrix.length, suffix.length);
      return result;
    }


     

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