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javacore第11版
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‎javacore第11版/corejava/gutenberg/alice30.txt‎

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‎javacore第11版/corejava/gutenberg/crsto10.txt‎

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‎javacore第11版/corejava/v1ch02/FXImageViewer/ImageViewer.java‎

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import java.io.*;
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import java.nio.file.*;
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import javafx.application.*;
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import javafx.scene.*;
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import javafx.scene.control.*;
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import javafx.scene.control.Alert.*;
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import javafx.scene.image.*;
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import javafx.scene.layout.*;
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import javafx.stage.*;
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import javafx.stage.FileChooser.*;
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/**
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* A program for viewing images.
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* @version 1.40 2017-12-10
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* @author Cay Horstmann
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*/
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public class ImageViewer extends Application
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{
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private static final int MIN_SIZE = 400;
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public void start(Stage stage) throws IOException
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{
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BorderPane pane = new BorderPane();
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MenuBar bar = new MenuBar();
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pane.setTop(bar);
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Menu fileMenu = new Menu("File");
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bar.getMenus().add(fileMenu);
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MenuItem openItem = new MenuItem("Open");
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openItem.setOnAction(event -> load(stage, pane));
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MenuItem exitItem = new MenuItem("Exit");
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exitItem.setOnAction(event -> System.exit(0));
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fileMenu.getItems().addAll(openItem, exitItem);
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stage.setScene(new Scene(pane, MIN_SIZE, MIN_SIZE));
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stage.setTitle("ImageViewer");
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stage.show();
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}
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/**
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* Loads an image.
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* @param stage the stage above which to place the file chooser
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* @param pane the pane into which to place the image view
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*/
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public void load(Stage stage, BorderPane pane)
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{
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FileChooser fileChooser = new FileChooser();
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fileChooser.getExtensionFilters().addAll(
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new ExtensionFilter("Image Files", "*.png", "*.jpg", "*.gif"),
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new ExtensionFilter("All Files", "*.*"));
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File file = fileChooser.showOpenDialog(stage);
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if (file != null)
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{
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try
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{
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Path path = file.toPath();
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Image image = new Image(Files.newInputStream(path));
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pane.setCenter(new ImageView(image));
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}
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catch (IOException e)
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{
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Alert alert = new Alert(AlertType.ERROR,
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"Cannot open file.");
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alert.showAndWait();
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}
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}
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}
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}

‎javacore第11版/corejava/v1ch02/FXImageViewer/cay.jpg‎

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‎javacore第11版/corejava/v1ch02/FXImageViewer/duke.gif‎

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‎javacore第11版/corejava/v1ch02/ImageViewer/ImageViewer.java‎

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import java.awt.*;
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import java.io.*;
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import javax.swing.*;
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/**
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* A program for viewing images.
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* @version 1.31 2018-04-10
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* @author Cay Horstmann
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*/
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public class ImageViewer
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{
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public static void main(String[] args)
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{
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EventQueue.invokeLater(() -> {
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var frame = new ImageViewerFrame();
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frame.setTitle("ImageViewer");
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frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
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frame.setVisible(true);
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});
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}
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}
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/**
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* A frame with a label to show an image.
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*/
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class ImageViewerFrame extends JFrame
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{
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private static final int DEFAULT_WIDTH = 300;
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private static final int DEFAULT_HEIGHT = 400;
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public ImageViewerFrame()
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{
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setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);
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// use a label to display the images
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var label = new JLabel();
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add(label);
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// set up the file chooser
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var chooser = new JFileChooser();
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chooser.setCurrentDirectory(new File("."));
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// set up the menu bar
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var menuBar = new JMenuBar();
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setJMenuBar(menuBar);
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var menu = new JMenu("File");
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menuBar.add(menu);
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var openItem = new JMenuItem("Open");
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menu.add(openItem);
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openItem.addActionListener(event -> {
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// show file chooser dialog
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int result = chooser.showOpenDialog(null);
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// if file selected, set it as icon of the label
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if (result == JFileChooser.APPROVE_OPTION)
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{
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String name = chooser.getSelectedFile().getPath();
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label.setIcon(new ImageIcon(name));
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}
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});
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var exitItem = new JMenuItem("Exit");
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menu.add(exitItem);
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exitItem.addActionListener(event -> System.exit(0));
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}
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}

‎javacore第11版/corejava/v1ch02/ImageViewer/cay.jpg‎

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‎javacore第11版/corejava/v1ch02/ImageViewer/cup.png‎

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‎javacore第11版/corejava/v1ch02/ImageViewer/duke.gif‎

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‎javacore第11版/corejava/v1ch02/Welcome/Welcome.java‎

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/**
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* This program displays a greeting for the reader.
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* @version 1.30 2014-02-27
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* @author Cay Horstmann
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*/
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public class Welcome
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{
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public static void main(String[] args)
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{
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String greeting = "Welcome to Core Java!";
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System.out.println(greeting);
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for (int i = 0; i < greeting.length(); i++)
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System.out.print("=");
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System.out.println();
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}
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}

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