Arrays as member variables & setting values

I am trying to use a scanner object to initialize an array object from a class but am stuck on how to do it.

static class MyDataStructure implements Comparable<MyDataStructure> {
//___________________Variable Declaration_______________________________
        private int testCases;
        private int numProblems;
        private int[] timeForCompletion;
        private int[] weight;
//___________________Constructor_________________________________________
        public MyDataStructure() {
            testCases = 0;
            numProblems = 0;
            timeForCompletion = new int[numProblems];
            weight = new int[numProblems];

        }
//_________________Accessors/Mutators____________________________________
        /**
         * @return the testCases
         */
        public int getTestCases () {
            return testCases;
        }

        /**
         * @param testCases
         *            the testCases to set
         */
        public void setTestCases (int testCases) {
            this.testCases = testCases;
        }

        /**
         * @return the numProblems
         */
        public int getNumProblems () {
            return numProblems;
        }

        /**
         * @param numProblems
         *            the numProblems to set
         */
        public void setNumProblems (int numProblems) {
            this.numProblems = numProblems;
        }

        /**
         * @return the timeForCompletion
         */
        public int[] getTimeForCompletion () {
            return timeForCompletion;
        }

        /**
         * @param timeForCompletion
         *            the timeForCompletion to set
         */
        public void setTimeForCompletion (int[] timeForCompletion) {
            this.timeForCompletion = timeForCompletion;
        }

        /**
         * @return the weight
         */
        public int[] getWeight () {
            return weight;
        }

        /**
         * @param weight
         *            the weight to set
         */
        public void setWeight (int[] weight) {
            this.weight = weight;
        }

here is my main method

public static void main (String[] args) {
        Scanner input = new Scanner (System.in);
        MyDataStructure ds = new MyDataStructure ();

        while (input.hasNext ()) {

            // initialize all values of ds
            ds.setTestCases (input.nextInt ());
            ds.setNumProblems (input.nextInt ());
            
            //problem is here!!!
            
            for(int i = 0; i< ds.numProblems; i++){
            ds.setTimeForCompletion(input.nextInt ());
            }

        }

input

1
2
2 3
12 4