FAQ: 2D Arrays: Java - 2D Array Review

This community-built FAQ covers the “2D Array Review” exercise from the lesson “2D Arrays: Java”.

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I have a question regarding the final section of the review exercise: For all exam grades less than 90, add 2 additional points to the grade in newScores.

I have solved it using the following code, which works fine:

for(int i = 0; i < newScores.length; i += 1){

    for(int j = 0; j < newScores[i].length; j += 1){

      if (newScores[i][j] < 90){

        newScores[i][j] += 2;


However, initially, my code was this:

for(double[] scoreSet : newScores){

    for(double score : scoreSet){

      if (score < 90){

        score += 2;


I could use the latter code to access the array values (for example by printing them), however, I couldn’t modify them. Why is that?

My thoughts are is that it is because in order to modify the array value, I need to access it’s location, rather than the value itself. Is that right?

Thank you!