lambda expression should be final FOR LOOP

Question

I am trying to retrieve some items from an activity list in order to show them with JavaFX but at the same time I also want to be able to delete these items if I click on the item's button. How can I distinguish which button I clicked in order to delete the right row? I'm trying to assign to the button the lambda expression but apparently it doesn't work in a for loop. Any suggestion on how to fix this?

   gridPane = new GridPane();

    String path = "image.png";
    items = new ArrayList<>();

    items.add("Activity 1");
    items.add("Activity 2");
    items.add("Activity 3");

    for (int i=0; i<items.size(); i++) {
        gridPane.add(new Text(items.get(i)), 1, i);
        gridPane.add(new JFXButton("", new ImageView(path)),2,i);
        (JFXButton)gridPane.setOnMouseClicked(e -> deleteActivity(gridPane.getRowIndex(i)));
    }

Variable used in lambda expression should be final or effectively final referred to the "i" in the last row — Jasmine
– Jasmine, Commented Mar 10, 2019 at 11:46
Possible duplicate of Variable used in lambda expression should be final or effectively final — Benjamin Urquhart
– Benjamin Urquhart, Commented Mar 10, 2019 at 11:50
Define a variable int ii = i; inside the loop, and use that in the lambda instead. — Andy Turner
– Andy Turner, Commented Mar 10, 2019 at 11:52
@AndyTurner now I get "Inconvertible types; cannot cast 'void' to 'com.jfoenix.controls.JFXButton'" because of the JFXButton casting — Jasmine
– Jasmine, Commented Mar 10, 2019 at 12:01

c0der · Accepted Answer · 2019-03-10 12:10:13Z

1

I asuume you wanted :

JFXButton button = new JFXButton("", new ImageView(path);   
gridPane.add(button),2,i);
button.setOnMouseClicked(e -> deleteActivity(gridPane.getRowIndex(i)));

answered Mar 10, 2019 at 12:10

c0der

18.9k6 gold badges38 silver badges70 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

lambda expression should be final FOR LOOP

1 Answer 1

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related