CODEWITHSUNDEEP
java
aeruhxi
aeruhxi

Reputation: 556

What is the efficient way to pass value from other class to Main class, in JAVA?

I have in main class:

 public void start(Stage primaryStage) throws Exception {

    Thread timeCheckThread = new Thread() {
        @Override
        public void run() {
            try{
                while (!done) {
                    System.out.println("Running!!");
                    System.out.println();
                    currentDate = LocalDate.now();
                    if (!oldDate.equals(currentDate)) {
                        index++;
                        saveData();
                        System.out.println("Saved!");
                    }
                    currentThread().sleep(5000);
                }
            }catch(InterruptedException e){
                e.printStackTrace();
            }
        }
    };

    timeCheckThread.start();      

    stage = primaryStage;
    stage.initStyle(StageStyle.TRANSPARENT);

    FXMLLoader loader = new FXMLLoader(getClass().getResource("sample.fxml"));
    Parent root = (Parent) loader.load();

    StackPane stackPane = new StackPane(root);
    stackPane.setStyle("-fx-background-color: rgba(0,0,0,0);");

    Scene scene = new Scene(stackPane, 312, 212);
    scene.setFill(Color.TRANSPARENT);
    stage.setScene(scene);

    Controller controller = loader.<Controller>getController();
    controller.registerStage(stage);
    stage.show();
}

//launch 'start'
public static void main(String[] args) {
    launch(args);
}

and in Controller class:

public void exitButtonClicked() {
    Platform.exit();
}

I want to pass a boolean from method exitButtonClicked to the main class so that I can end the loop of while(!done). What is the efficient approach to accomplish this? Is, having a setter for done in a main method, and invoking that setter from an instance of Main class in Controller class, a good method?

Upvotes: 2

Views: 156

Answers (2)

matt
matt

Reputation: 12346

There are two issues. Your controller needs access to the variables, and you have a 5s sleep. One way to do it, without passing around an instance of your main class is to make a static utility method.

class Main extends Application{
    static volatile boolean done = false;
    static Thread timeCheckThread;
    static void applicationIsExiting(){
        done = true;
        timeCheckThread.interrupt();
    }
}

Then when you create the time check thread assign it to the static variable:

 timeCheckThread = new Thread() { ...

The method in your controller would have a call the utility method.

public void exitButtonClicked() {
    Platform.exit();
    Main.applicationIsExiting();
}

Upvotes: 1

ninja.coder
ninja.coder

Reputation: 9648

Create a final class or interface with a boolean. Set/Get this boolean wherever you need.

public final class foo {
     public static boolean flag = false;
}

In your Controller Class:

foo.flag = true;

In your Main Class:

while(!foo.flag) {
     /* Do Something */
}

Upvotes: 2

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