Group class is a part of JavaFX. A Group contains the number of nodes. A Group will take on the collective bounds of its children and is not directly resizable. Group class inherits Parent class.
Constructor of the class:
- Group(): Constructs a new group.
- Group(Collection children): Constructs a new group with specified nodes.
- Group(Nodeā¦ c): Constructs a new group with specified nodes.
Commonly Used Methods:
| Method | Explanation |
|---|---|
| getChildren() | Returns the children of the group. |
| isAutoSizeChildren() | Gets the value of the property autoSizeChildren. |
| minHeight(double width) | Returns the nodeās minimum height for use in layout calculations. |
| minWidth(double height) | Returns the nodeās minimum width for use in layout calculations. |
| prefHeight(double width) | Group defines the preferred height as simply being the height of its layout bounds. |
| prefWidth(double height) | Group defines the preferred width as simply being the width of its layout bounds. |
| setAutoSizeChildren(boolean v) | Sets the value of the property autoSizeChildren. |
Below programs illustrate the use of Group class:
- Java Program to create a Group and add it to the stage: In this program we are creating a Label named label, and a Circle named circle. Now create a Group name group and add the label and circle to it by using the getChildren().add() function. Create a scene and add the group to the scene. Add the scene to the stage and display the stage to view the final results.
// Java Program to create a Group// and add it to the stageimportjavafx.application.Application;importjavafx.scene.Scene;importjavafx.scene.control.*;importjavafx.scene.layout.*;importjavafx.stage.Stage;importjavafx.event.ActionEvent;importjavafx.event.EventHandler;importjavafx.scene.canvas.*;importjavafx.scene.web.*;importjavafx.scene.Group;importjavafx.scene.shape.*;ĀĀpublicclassGroup_1extendsApplication {ĀĀĀ Ā Ā Ā// launch the applicationĀ Ā Ā Āpublicvoidstart(Stage stage)Ā Ā Ā Ā{ĀĀĀ Ā Ā Ā Ā Ā Ā Ātry{ĀĀĀ Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā// set title for the stageĀ Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Āstage.setTitle("Group");ĀĀĀ Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā// create a GroupĀ Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā ĀGroup group =newGroup();ĀĀĀ Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā// create a labelĀ Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā ĀLabel label =newLabel("this is Group example");ĀĀĀ Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā// add label to groupĀ Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Āgroup.getChildren().add(label);ĀĀĀ Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā// circleĀ Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā ĀCircle c =newCircle(100,100,30);ĀĀĀ Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā// add Circle to GroupĀ Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Āgroup.getChildren().add(c);ĀĀĀ Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā// create a sceneĀ Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā ĀScene scene =newScene(group,400,300);ĀĀĀ Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā// set the sceneĀ Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Āstage.setScene(scene);ĀĀĀ Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Āstage.show();Ā Ā Ā Ā Ā Ā Ā Ā}ĀĀĀ Ā Ā Ā Ā Ā Ā Ācatch(Exception e) {ĀĀĀ Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā ĀSystem.out.println(e.getMessage());Ā Ā Ā Ā Ā Ā Ā Ā}Ā Ā Ā Ā}ĀĀĀ Ā Ā Ā// Main MethodĀ Ā Ā Āpublicstaticvoidmain(String args[])Ā Ā Ā Ā{ĀĀĀ Ā Ā Ā Ā Ā Ā Ā// launch the applicationĀ Ā Ā Ā Ā Ā Ā Ālaunch(args);Ā Ā Ā Ā}}Output:
- Java Program to create a Group, set auto resize to true and add it to the stage: In this program we are creating a Label named label and a Circle named circle. Then we will create a Group name group and add the label and circle to it by using the getChildren().add() function. Set the auto size children to true using the setAutoSize() function. Create a scene and add the group to the scene. Add the scene to the stage and display the stage to view the final results.
// Java Program to create a Group,// set auto resize to true// and add it to the stageimportjavafx.application.Application;importjavafx.scene.Scene;importjavafx.scene.control.*;importjavafx.scene.layout.*;importjavafx.stage.Stage;importjavafx.event.ActionEvent;importjavafx.event.EventHandler;importjavafx.scene.canvas.*;importjavafx.scene.web.*;importjavafx.scene.Group;importjavafx.scene.shape.*;ĀĀpublicclassGroup_2extendsApplication {ĀĀĀ Ā Ā Ā// launch the applicationĀ Ā Ā Āpublicvoidstart(Stage stage)Ā Ā Ā Ā{ĀĀĀ Ā Ā Ā Ā Ā Ā Ātry{ĀĀĀ Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā// set title for the stageĀ Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Āstage.setTitle("Group");ĀĀĀ Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā// create a GroupĀ Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā ĀGroup group =newGroup();ĀĀĀ Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā// create a labelĀ Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā ĀLabel label =newLabel("this is Group example");ĀĀĀ Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā// add label to groupĀ Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Āgroup.getChildren().add(label);ĀĀĀ Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā// circleĀ Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā ĀCircle c =newCircle(50,50,30);ĀĀĀ Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā// set auto resizeĀ Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Āgroup.setAutoSizeChildren(true);ĀĀĀ Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā// add Circle to GroupĀ Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Āgroup.getChildren().add(c);ĀĀĀ Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā// create a sceneĀ Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā ĀScene scene =newScene(group,400,300);ĀĀĀ Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā// set the sceneĀ Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Āstage.setScene(scene);ĀĀĀ Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Āstage.show();Ā Ā Ā Ā Ā Ā Ā Ā}ĀĀĀ Ā Ā Ā Ā Ā Ā Ācatch(Exception e) {ĀĀĀ Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā ĀSystem.out.println(e.getMessage());Ā Ā Ā Ā Ā Ā Ā Ā}Ā Ā Ā Ā}ĀĀĀ Ā Ā Ā// Main MethodĀ Ā Ā Āpublicstaticvoidmain(String args[])Ā Ā Ā Ā{ĀĀĀ Ā Ā Ā Ā Ā Ā Ā// launch the applicationĀ Ā Ā Ā Ā Ā Ā Ālaunch(args);Ā Ā Ā Ā}}Output:
Note: The above programs might not run in an online IDE. Please use an offline compiler.
Reference: https://docs.oracle.com/javase/8/javafx/api/javafx/scene/Group.html
