import javafx.application.Application;import javafx.event.ActionEvent;import javafx.event.EventHandler;import javafx.scene.Scene;import javafx.scene.control.Button;import javafx.scene.control.Label;import javafx.scene.control.TextField;import javafx.scene.layout.AnchorPane;import javafx.scene.text.Font;import javafx.scene.text.Text;import javafx.stage.Stage;public class Sfw_test extends Application{    AnchorPane root = new AnchorPane();    Scene scene = new Scene(root, 400, 120);        public static void main(String[] args) {        Application.launch(args);    }        public void start(Stage stage){        stage.setTitle("Leapyear Test");                Text text = new Text();        text.setText("Input the year:");        text.setFont(Font.font ("", 15));        AnchorPane.setTopAnchor(text, 20.0);        AnchorPane.setLeftAnchor(text, 10.0);                final TextField textField = new TextField ();        textField.setPrefWidth(150);        textField.getText();        AnchorPane.setTopAnchor(textField, 20.0);        AnchorPane.setLeftAnchor(textField, 130.0);                final Label label1 = new Label(" ");        label1.setFont(Font.font ("BLACK", 16));        AnchorPane.setTopAnchor(label1, 60.0);        AnchorPane.setLeftAnchor(label1, 10.0);                Button submit = new Button();        submit.setText("  Submit  ");        AnchorPane.setTopAnchor(submit, 20.0);        AnchorPane.setLeftAnchor(submit, 300.0);                submit.setOnAction(new EventHandler
     
      () {            @Override                public void handle(ActionEvent e) {                    String year = textField.getText().toString();                    boolean inputlegal = false;                    int Isleapyear = 2;                    for (int i=0; i
     

程序测试截图如下：