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BounceThread.java
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127 lines (116 loc) · 2.79 KB
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package bounceThread;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
/**
* Shows animated bouncing balls.
* @version 1.33 2007-05-17
* @author Cay Horstmann
*/
public class BounceThread
{
public static void main(String[] args)
{
EventQueue.invokeLater(new Runnable()
{
public void run()
{
JFrame frame = new BounceFrame();
frame.setTitle("BounceThread");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
});
}
}
/**
* A runnable that animates a bouncing ball.
*/
class BallRunnable implements Runnable
{
private Ball ball;
private Component component;
public static final int STEPS = 1000;
public static final int DELAY = 5;
/**
* Constructs the runnable.
* @param aBall the ball to bounce
* @param aComponent the component in which the ball bounces
*/
public BallRunnable(Ball aBall, Component aComponent)
{
ball = aBall;
component = aComponent;
}
public void run()
{
try
{
for (int i = 1; i <= STEPS; i++)
{
ball.move(component.getBounds());
component.repaint();
Thread.sleep(DELAY);
}
}
catch (InterruptedException e)
{
}
}
}
/**
* The frame with panel and buttons.
*/
class BounceFrame extends JFrame
{
private BallComponent comp;
/**
* 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", new ActionListener()
{
public void actionPerformed(ActionEvent event)
{
addBall();
}
});
addButton(buttonPanel, "Close", new ActionListener()
{
public void actionPerformed(ActionEvent 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 b = new Ball();
comp.add(b);
Runnable r = new BallRunnable(b, comp);
Thread t = new Thread(r);
t.start();
}
}