Java arrays change size

Question

I need to change the size of an array, but I cannot simply create another - It needs the same name so I can pass it to a method. Specifically, I need the array to have twice

Answer 1

An array is an Array. Here you can dynamically increase the size of the array, keeping its name. In this instance, it is increasing its size until the sum of its indexes reaches the goal, which is 100.

    int goal = 0;
    int[] arr = {1,2,3};

    int i = 0;
    while (goal<100){
        goal+=arr[i];
        i++;
        int[] tmpArray = new int[arr.length];
        for (int j = 0; j < arr.length; j++) {
            tmpArray[j] = arr[j];
        }
        if(i>=arr.length){
            arr = new int[arr.length+1];
            for (int j = 0; j < tmpArray.length; j++) {
                arr[j] = tmpArray[j];
            }
            arr[arr.length-1] = 1;
        }
    }