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public class StageTest extends application {	@Override	public void start(Stage PRimaryStage) throws Exception {		primaryStage.setWidth(600);		primaryStage.setHeight(400);		primaryStage.setScene(new Scene(new StackPane()));		primaryStage.show();		{// 非模態			Stage stage = new Stage();			stage.setWidth(300);			stage.setHeight(200);			stage.show();		}		{// 模態			Stage stage = new Stage();			stage.initModality(Modality.APPLICATION_MODAL);			stage.setWidth(300);			stage.setHeight(200);			stage.show();		}	}	public static void main(String[] args) {		Application.launch(args);	}}