javafx实现模态/模式窗口

import javafx.stage.*;
import javafx.scene.*;
import javafx.scene.paint.Color;
import javafx.scene.control.*;
import javafx.event.ActionEvent;
import javafx.event.EventHandler; public class ModalDialog {
  Button btn;
  public ModalDialog(final Stage stg) {
  btn = new Button("OK");   final Stage stage = new Stage();
  //Initialize the Stage with type of modal
  stage.initModality(Modality.APPLICATION_MODAL);
  //Set the owner of the Stage
  stage.initOwner(stg);
  stage.setTitle("Top Stage With Modality");
  Group root = new Group();
  Scene scene = new Scene(root, 300, 250, Color.LIGHTGREEN);   btn.setOnAction(new EventHandler<ActionEvent>() {     public void handle(ActionEvent event) {
      stage.close();
}
  });   btn.setLayoutX(100);
  btn.setLayoutY(80);   root.getChildren().add(btn);
  stage.setScene(scene);
  stage.show();
  }
}
代码2:
import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.paint.Color;
import javafx.stage.Stage; public class ModalTest extends Application { /**
* @param args the command line arguments
*/
public static void main(String[] args) {
Application.launch(ModalTest.class, args);
  //    launch(args);
} @Override
public void start(final Stage primaryStage) {
  primaryStage.setTitle("Hello World");
  Group root = new Group();
  Scene scene = new Scene(root, 500, 450, Color.LIGHTBLUE);
  Button btn = new Button();
  btn.setLayoutX(250);
  btn.setLayoutY(240);
  btn.setText("Show modal dialog");
  btn.setOnAction(new EventHandler<ActionEvent>() {
    public void handle(ActionEvent event) {
    ModalDialog md = new ModalDialog(primaryStage);
    }
  });
  root.getChildren().add(btn);
  primaryStage.setScene(scene);
  primaryStage.show();
  }
}
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