Java error value might have already been assigned

Question

I would like to use the code below to set up an array of listeners

     public void setListeners() {
    final int k ;
    for (k=0; k<6; k++) {
        mNumberView[k].addTextChangedListener(new TextWatcher() {
            @Override

            public void onTextChanged(CharSequence s, int start, int before, int count) {
                mSprintHrs[k] = calcSprint(0, s);
                String mSH = String.format("%.1f", mSprintHrs[k]);
                mSprintView[k].setText(mSH);
                calcTotal();
            }

            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after) {

            }

            @Override
            public void afterTextChanged(Editable s) {

            }
        });

I get a compiler error on k++ in the for statement

 Value k might already been assigned to

Any workaround?

Answer 1

The error is because you're trying to modify a final variable. If you need to access a mutable variable inside an anonymous subclass, you'll have to copy it to a final variable:

for (int i=0; i<6; i++) {
    final int k = i;

A possibly cleaner workaround would be to extract the loop body to a separate method with a final parameter.