检查这段代码:package ex3_1; import javafx.geometry.Insets; import javafx.geometry.Pos; import javafx.scene.Scene; import javafx.scene.control.Button; import javafx.scene.control.Label; import javafx.scene.layout.BorderPane; import javafx.scene.layout.HBox; import javafx.scene.layout.Pane; import javafx.stage.Stage; import sun.launcher.resources.launcher; public class demo2 { private void start (Stage stage) { HBox hbox = new HBox(10); Button btn1 = new Button("第一页"), btn2 = new Button("上一页"), btn3 = new Button("下一页"), btn4 = new Button("最后一页"); hbox.setAlignment(Pos.CENTER); hbox.getChildren().addAll(btn1,btn2,btn3,btn4); Pane pane = new Pane(); Label label = new Label("这是一个标签"); pane.getChildren().add(label); BorderPane rootNode = new BorderPane(); rootNode.setPadding(new Insets(10,10,10,10)); rootNode.setCenter(pane); rootNode.setBottom(hbox); Scene scene = new Scene(rootNode, 300, 100); stage.setTitle("面板布局示例"); stage.setScene(scene); stage.show(); } public static void main(String[] args) { launch(args); } }
时间: 2023-12-03 21:44:27 浏览: 51
这段代码有一些问题:
1. 缺少导入 `javafx.application.Application` 类。
2. `start` 方法的访问修饰符应该为 `public`,而不是默认的包访问权限。
3. 缺少 `launch` 方法的实现。
下面是修复后的代码:
```java
package ex3_1;
import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.HBox;
import javafx.scene.layout.Pane;
import javafx.stage.Stage;
public class Demo2 extends Application {
@Override
public void start(Stage stage) {
HBox hbox = new HBox(10);
Button btn1 = new Button("第一页"),
btn2 = new Button("上一页"),
btn3 = new Button("下一页"),
btn4 = new Button("最后一页");
hbox.setAlignment(Pos.CENTER);
hbox.getChildren().addAll(btn1,btn2,btn3,btn4);
Pane pane = new Pane();
Label label = new Label("这是一个标签");
pane.getChildren().add(label);
BorderPane rootNode = new BorderPane();
rootNode.setPadding(new Insets(10,10,10,10));
rootNode.setCenter(pane);
rootNode.setBottom(hbox);
Scene scene = new Scene(rootNode, 300, 100);
stage.setTitle("面板布局示例");
stage.setScene(scene);
stage.show();
}
public static void main(String[] args) {
launch(args);
}
}
```