corejava第10版

corejava第10版/v1ch14/bounceThread/BounceThread.java

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+package bounceThread;
+
+import java.awt.*;
+import java.awt.event.*;
+
+import javax.swing.*;
+
+/**
+ * Shows animated bouncing balls.
+ * @version 1.34 2015-06-21
+ * @author Cay Horstmann
+ */
+public class BounceThread
+{
+   public static void main(String[] args)
+   {
+      EventQueue.invokeLater(() -> {
+         JFrame frame = new BounceFrame();
+         frame.setTitle("BounceThread");
+         frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+         frame.setVisible(true);
+      });
+   }
+}
+
+/**
+ * The frame with panel and buttons.
+ */
+class BounceFrame extends JFrame
+{
+   private BallComponent comp;
+   public static final int STEPS = 1000;
+   public static final int DELAY = 5;
+
+
+   /**
+    * Constructs the frame with the component for showing the bouncing ball and
+    * Start and Close buttons
+    */
+   public BounceFrame()
+   {
+      comp = new BallComponent();
+      add(comp, BorderLayout.CENTER);
+      JPanel buttonPanel = new JPanel();
+      addButton(buttonPanel, "Start", event -> addBall());
+      addButton(buttonPanel, "Close", event -> System.exit(0));
+      add(buttonPanel, BorderLayout.SOUTH);
+      pack();
+   }
+
+   /**
+    * Adds a button to a container.
+    * @param c the container
+    * @param title the button title
+    * @param listener the action listener for the button
+    */
+   public void addButton(Container c, String title, ActionListener listener)
+   {
+      JButton button = new JButton(title);
+      c.add(button);
+      button.addActionListener(listener);
+   }
+
+   /**
+    * Adds a bouncing ball to the canvas and starts a thread to make it bounce
+    */
+   public void addBall()
+   {
+      Ball ball = new Ball();
+      comp.add(ball);
+      Runnable r = () -> { 
+         try
+         {  
+            for (int i = 1; i <= STEPS; i++)
+            {
+               ball.move(comp.getBounds());
+               comp.repaint();
+               Thread.sleep(DELAY);
+            }
+         }
+         catch (InterruptedException e)
+         {
+         }
+      };
+      Thread t = new Thread(r);
+      t.start();
+   }
+}