自己用javafx練習(xí)組合框時寫了一個小程序，使用到了文件輸入，但是調(diào)用需要拋出異常的函數(shù)時，明明已經(jīng)拋出了，為什么還提示未報告異常？ import javafx.application.Application; import javafx.stage.Stage; import javafx.collections.FXCollections; import javafx.collections.ObservableList; import javafx.scene.Scene; import javafx.scene.control.ComboBox; import javafx.scene.control.Label; import javafx.scene.image.ImageView; import javafx.scene.layout.BorderPane; import java.util.*; public class ComboBoxDemo extends Application { private String[] flagTitle = {"Canada","America","China"}; private ImageView[] flagImage = {new ImageView("card/canada.gif"),new ImageView("card/america.gif"),new ImageView("card/china")}; private String[] flagDescription = {"Canada.txt","America.txt","China.txt"}; private DescriptionPane descriptionPane = new DescriptionPane(); private ComboBox<String> cbo = new ComboBox<>(); @Override public void start(Stage primaryStage) throws Exception { setDisplay(0); BorderPane pane = new BorderPane(); BorderPane paneForComboBox = new BorderPane(); paneForComboBox.setLeft(new Label("Select a Country")); paneForComboBox.setCenter(cbo); pane.setTop(paneForComboBox); cbo.setPrefWidth(400); cbo.setValue("Canada"); ObservableList<String> item = FXCollections.observableArrayList(flagTitle); cbo.getItems().addAll(item); pane.setCenter(descriptionPane); ***cbo.setOnAction(e->setDisplay(item.indexOf(cbo.getValue())));*** Scene scene = new Scene(pane,400,500); primaryStage.setTitle("ComboBoxDemo"); primaryStage.setScene(scene); primaryStage.show(); } public void setDisplay(int index) throws Exception { descriptionPane.setTitle(flagDescription[index]); descriptionPane.setImage(flagImage[index]); descriptionPane.setDescription(flagDescription[index]); } } import javafx.geometry.Insets; import javafx.scene.control.Label; import javafx.scene.control.ContentDisplay; import javafx.scene.control.ScrollPane; import javafx.scene.control.TextArea; import javafx.scene.image.ImageView; import javafx.scene.layout.BorderPane; import javafx.scene.text.Text; import javafx.scene.text.Font; import java.util.Scanner; import java.io.File; public class DescriptionPane extends BorderPane { private Label lblImageTitle = new Label(); private TextArea taDescription = new TextArea(); public DescriptionPane() { lblImageTitle.setContentDisplay(ContentDisplay.TOP); lblImageTitle.setPrefSize(200,200); lblImageTitle.setFont(new Font("SansSerif",16)); taDescription.setFont(new Font("Serif",14)); taDescription.setEditable(false); taDescription.setWrapText(true); ScrollPane scrollPane = new ScrollPane(taDescription); setLeft(lblImageTitle); setCenter(scrollPane); setPadding(new Insets(5,5,5,5)); } public void setTitle(String title) { lblImageTitle.setText(title); } public void setImage(ImageView icon) { lblImageTitle.setGraphic(icon); } public void setDescription(String name) throws Exception { File file = new File(name); String description = new Scanner(file).next(); taDescription.setText(description); } } D:javaJCComboBoxDemo.java:38: 錯誤: 未報告的異常錯誤Exception; 必須對其進(jìn)行捕獲或聲明以便拋出 cbo.setOnAction(e->setDisplay(item.indexOf(cbo.getValue()))); 作為菜鳥的我百思不得其解·自己弄了一下午了！