Local variables referenced from an inner class must be final or effectively final

Question

Problem :

Currently I am having issues while figuring out why am I receiving below error

"Local variables referenced from an inner class must be final or effectively final".

My program is running the concurrent threads to sort the array of #'s and then trying to find the high and the low values of my array. When I created my program without the concurrency I was not facing above error. Now I am struggling to know how to finalize the high and low variable.

public void MyHiLo(int[] numbers){

    int myhigh = numbers[0];

    int mylow = numbers[0];

    Runnable myr2 = new Runnable(){

        @Override

        public void run() {

            System.out.println("My highest value is: ");

            for (int myindex = 1;my index < numbers.length;myindex++){

                if (numbers[myindex] > myhigh)

                    myhigh = numbers[myindex];

                System.out.println(myhigh);

                }

            .

.

.

.

}

Above block of code is producing the error.

Answer 1

You are updating both high and low inside your run() method, making them by definition not effectively the final.

As you do not need them outside your run() method anyways so just move your two lines inside as shown below :

public void MyHiLo(int[] numbers){

    Runnable myr2 = new Runnable(){

        @Override

        public void run() {

            int myhigh = numbers[0];

            int mylow = numbers[0];

            System.out.println("My highest value is: ");

 

If you follow above approach your issue will be resolved.