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corejava第10版
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javacore第11版/corejava/gutenberg/alice30.txt renamed to corejava第10版/gutenberg/alice30.txt

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javacore第11版/corejava/gutenberg/crsto10.txt renamed to corejava第10版/gutenberg/crsto10.txt

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‎corejava第10版/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 1.30 2014-02-27
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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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JFrame 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 JLabel label;
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private JFileChooser chooser;
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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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label = new JLabel();
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add(label);
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// set up the file chooser
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chooser = new JFileChooser();
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chooser.setCurrentDirectory(new File("."));
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// set up the menu bar
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JMenuBar menuBar = new JMenuBar();
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setJMenuBar(menuBar);
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JMenu menu = new JMenu("File");
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menuBar.add(menu);
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JMenuItem 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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JMenuItem 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/FXImageViewer/cay.jpg renamed to corejava第10版/v1ch02/ImageViewer/cay.jpg

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javacore第11版/corejava/v1ch02/FXImageViewer/duke.gif renamed to corejava第10版/v1ch02/ImageViewer/duke.gif

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javacore第11版/corejava/v1ch02/ImageViewer/cup.png renamed to corejava第10版/v1ch02/ImageViewer/mug.png

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‎corejava第10版/v1ch02/RoadApplet/RoadApplet.html‎

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<html xmlns="http://www.w3.org/1999/xhtml">
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<head><title>A Traffic Simulator Applet</title></head>
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<body>
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<h1>Traffic Simulator Applet</h1>
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<p>I wrote this traffic simulation, following the article &quot;Und nun die
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Stauvorhersage&quot; of the German Magazine <i>Die Zeit</i>, June 7,
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1996. The article describes the work of Professor Michael Schreckenberger
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of the University of Duisburg and unnamed collaborators at the University
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of Cologne and Los Alamos National Laboratory. These researchers model
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traffic flow according to simple rules, such as the following: </p>
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<ul>
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<li>A freeway is modeled as a sequence of grid points. </li>
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<li>Every car occupies one grid point. Each grid point occupies at most
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one car. </li>
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<li>A car can have a speed of 0 - 5 grid points per time interval. </li>
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<li>A car with speed of less than 5 increases its speed by one unit in
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each time interval, until it reaches the maximum speed. </li>
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<li>If a car's distance to the car in front is <i>d</i> grid points, its
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speed is reduced to <i>d</i>-1 if necessary to avoid crashing into it.
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</li>
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<li>With a certain probability, in each time interval some cars slow down
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one unit for no good reason whatsoever. </li>
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</ul>
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<p>This applet models these rules. Each line shows an image of the same
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stretch of road. Each square denotes one car. The first scrollbar lets you
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adjust the probability that some cars slow down. If the slider is all the
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way to the left, no car slows down. If it is all the way to the right,
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every car slows down one unit. A typical setting is that 10% - 20% of the
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cars slow down. The second slider controls the arrival rate of the cars.
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When it is all the way to the left, no new cars enter the freeway. If it
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is all the way to the right, a new car enters the freeway every time
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interval, provided the freeway entrance is not blocked. </p>
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<p>Try out the following experiments. Decrease the probability of slowdown
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to 0. Crank up the arrival rate to 1. That means, every time unit, a new
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car enters the road. Note how the road can carry this load. </p>
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<p>Now increase the probability that some cars slow down. Note how traffic
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jams occur almost immediately. </p>
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<p>The moral is: If it wasn't for the rubberneckers, the cellular phone
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users, and the makeup-appliers who can't keep up a constant speed, we'd all
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get to work more quickly. </p>
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<p>Notice how the traffic jam is stationary or even moves backwards, even
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though the individual cars are still moving. In fact, the first car
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causing the jam has long left the scene by the time the jam gets bad.
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(To make it easier to track cars, every tenth vehicle is colored red.) </p>
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<p><applet code="RoadApplet.class" archive="RoadApplet.jar"
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width="400" height="400" alt="Traffic jam visualization">
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</applet></p>
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<p>For more information about applets, graphics programming and
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multithreading in Java, see
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<a href="http://horstmann.com/corejava">Core Java</a>. </p>
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</body>
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</html>

‎corejava第10版/v1ch02/RoadApplet/RoadApplet.jar‎

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‎corejava第10版/v1ch02/RoadApplet/RoadApplet.java‎

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import java.awt.*;
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import java.applet.*;
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import javax.swing.*;
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public class RoadApplet extends JApplet
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{
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private RoadComponent roadComponent;
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private JSlider slowdown;
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private JSlider arrival;
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public void init()
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{
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EventQueue.invokeLater(() ->
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{
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roadComponent = new RoadComponent();
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slowdown = new JSlider(0, 100, 10);
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arrival = new JSlider(0, 100, 50);
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JPanel p = new JPanel();
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p.setLayout(new GridLayout(1, 6));
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p.add(new JLabel("Slowdown"));
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p.add(slowdown);
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p.add(new JLabel(""));
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p.add(new JLabel("Arrival"));
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p.add(arrival);
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p.add(new JLabel(""));
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setLayout(new BorderLayout());
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add(p, BorderLayout.NORTH);
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add(roadComponent, BorderLayout.CENTER);
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});
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}
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public void start()
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{
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new Thread(() ->
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{
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for (;;)
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{
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roadComponent.update(
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0.01 * slowdown.getValue(),
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0.01 * arrival.getValue());
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try { Thread.sleep(50); } catch(InterruptedException e) {}
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}
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}).start();
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}
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}

‎corejava第10版/v1ch02/RoadApplet/RoadApplet.mf‎

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Manifest-Version: 1.0
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Permissions: sandbox

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