javafx - java: Is it possible to set a lambda expression for an array of Buttons is a for loop? If so how?

Question

I want to be able to do something like this:

for(i = 0; i < 10; i++) {
    //if any button in the array is pressed, disable it.
    button[i].setOnAction( ae -> { button[i].setDisable(true) } );
}

However, I get a error saying "local variables referenced from a lambda expression must be final or effectively final". How might I still do something like the code above (if it is even possible)? If it can't be done, what should be done instead to get a similar result?

Answer 1

As the error message says, local variables referenced from a lambda expression must be final or effectively final ("effectively final" meaning the compiler can make it final for you).

Simple workaround:

for(i = 0; i < 10; i++) {
    final int ii = i;
    button[i].setOnAction( ae -> { button[ii].setDisable(true) } );
}