我在完成 Try and Catch 时遇到问题。我不断收到语法错误,询问不需要“(”“{”“;”标记的地方。在整个搜索中寻找答案,但我尚未得出为什么我不断收到此错误的结论。这是我的代码
import javax.swing.JOptionPane;
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.MenuBar;
import javafx.scene.control.TextField;
import javafx.scene.layout.VBox;
import javafx.scene.web.WebEngine;
import javafx.scene.web.WebHistory;
import javafx.scene.web.WebView;
import javafx.stage.Stage;
public class Browser extends Application{
final Button Back = new Button("<-");
final Button Forward = new Button ("->");
final Button Home = new Button("Home");
final Button Reload = new Button("r");
final MenuBar menuBar = new MenuBar();
final TextField txt = new TextField();
@Override
public void start(Stage stage) throws Exception{
VBox hBox = new VBox();
WebView wv = new WebView();
WebEngine engine = wv.getEngine();
WebHistory wh = engine.getHistory();
engine.load("https://www.google.com");
txt.setOnAction(new EventHandler<ActionEvent>(){
try{
public void handle(ActionEvent event){
engine.load(txt.getText());
}
}catch(Exception e){
showError("Unable to load site");
}
});
hBox.getChildren().setAll(txt, wv);
Scene scene = new Scene(hBox, 800, 600);
stage.setTitle("Anthony Gayflor-CS260 OOP");
stage.setScene(scene);
stage.show();
}
private void showError(String errorMessage){
JOptionPane.showMessageDialog(this, errorMessage, "Error", JOptionPane.ERROR_MESSAGE);
}
public static void main(String[] args){
Application.launch(args);
}
}
当我编译它时,我得到的错误是
Caused by: java.lang.Error: Unresolved compilation problems:
Syntax error, insert "}" to complete ClassBody
Syntax error, insert ")" to complete MethodInvocation
Syntax error, insert ";" to complete Statement
Syntax error on token "(", ; expected
Syntax error on token ")", ; expected
Syntax error on tokens, delete these tokens
at Browser.start(Browser.java:33)
最佳答案
除了 Jens 的回答之外,您还可以在 Java 8 中使用 lambda,因为 EventHandler
是一个函数式接口(interface)。那么你的代码将如下所示:
txt.setOnAction(event -> {
try {
engine.load(txt.getText());
}catch (Exception e) {
showError("Unable to load site");
}
});
关于java - Try & Catch 中的语法错误,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/40781014/