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cs621: proj1: ClockApplet added, completed

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git-svn-id: svn://anubis/gvsu@10 45c1a28c-8058-47b2-ae61-ca45b979098e
This commit is contained in:
josh 2008-02-03 05:35:27 +00:00
parent 2d610b1c83
commit c5eb553073
5 changed files with 212 additions and 114 deletions
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60
cs621/proj1/Clock.java
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@ -1,30 +1,30 @@
/** /**
* A front-end class to display and update a ClockView object. * A front-end class to display and update a ClockView object.
*/ */
public class Clock public class Clock
{ {
/** /**
* This method is the entry point when the user invokes the program. * This method is the entry point when the user invokes the program.
* @param args Any command-line arguments supplied during invocation. * @param args Any command-line arguments supplied during invocation.
*/ */
public static void main (String args[]) public static void main (String args[])
{ {
ClockView cv = new ClockView(); ClockView cv = new ClockView();
cv.setVisible (true); cv.setVisible (true);
// loop about every 0.5 seconds // loop about every 0.5 seconds
try try
{ {
for (;;) for (;;)
{ {
cv.refreshTimeDisplay (); cv.refreshTimeDisplay ();
Thread.sleep (500); Thread.sleep (500);
} }
} }
catch (Exception e) catch (Exception e)
{ {
System.out.println("Error:" + e); System.out.println("Error:" + e);
} }
} }
} }

10
cs621/proj1/ClockApplet.html Normal file
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@ -0,0 +1,10 @@
<html>
<head><title>Clock Applet</title></head>
<body>
<center>
<h1><b>Clock Applet</b></h1>
<applet code="ClockApplet.class" width=150 height=60></applet>
</center>
</body>
</html>

88
cs621/proj1/ClockApplet.java Normal file
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@ -0,0 +1,88 @@
import javax.swing.JApplet; // import class JApplet
import java.awt.Graphics; // import class Graphics
import java.awt.*;
/**
* This class provides an applet displaying the current time.
*/
public class ClockApplet extends JApplet
{
private Thread animator = null;
/**
* Called to stop the applet.
*/
public void stop()
{
if (animator != null)
animator.interrupt();
animator = null;
}
/**
* Method called to begin the applet.
*/
public void start()
{
if (animator == null)
{
animator = new Thread() {
public void run() {
updateTime();
}
};
animator.start();
}
}
/**
* The method run by the animator thread.
*/
public void updateTime()
{
try
{
while (!Thread.interrupted())
{
repaint();
Thread.sleep(500);
}
}
catch (InterruptedException e) { }
}
/**
* This function draws the applet's contents.
* @param g the graphics object to draw with
*/
public void paint( Graphics g )
{
Timestamp t = new Timestamp();
t.fillTimes();
String display = getDigitsAsString(t.hrs) + ":" +
getDigitsAsString(t.mins) + ":" +
getDigitsAsString(t.secs) + " " +
t.am_pm;
g.setColor(Color.white);
g.fillRect(0, 0, 150, 60);
g.setColor(Color.black);
g.drawString(display, 10, 50);
}
/**
* Helper method to convert an integer to a 0-padded string.
* @param i The integer to convert
* @return A string representing the integer, padded on the
* left by a '0' character if the integer was less than 10.
*/
protected String getDigitsAsString(int i)
{
String str = Integer.toString(i);
if (i < 10)
str = "0" + str;
return str;
}
}

108
cs621/proj1/ClockView.java
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@ -1,54 +1,54 @@
import javax.swing.*; import javax.swing.*;
/** /**
* This class provides a graphical view of the current time * This class provides a graphical view of the current time
*/ */
public class ClockView extends JFrame public class ClockView extends JFrame
{ {
private JLabel tLabel = new JLabel(); private JLabel tLabel = new JLabel();
/** /**
* Constructor method to make a ClockView object. * Constructor method to make a ClockView object.
*/ */
public ClockView() public ClockView()
{ {
super("Clock"); super("Clock");
setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE); setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
setSize(100, 70); setSize(100, 70);
tLabel.setHorizontalAlignment(SwingConstants.CENTER); tLabel.setHorizontalAlignment(SwingConstants.CENTER);
getContentPane().add(tLabel); getContentPane().add(tLabel);
refreshTimeDisplay(); refreshTimeDisplay();
} }
/** /**
* Helper method to convert an integer to a 0-padded string. * Helper method to convert an integer to a 0-padded string.
* @param i The integer to convert * @param i The integer to convert
* @return A string representing the integer, padded on the * @return A string representing the integer, padded on the
* left by a '0' character if the integer was less than 10. * left by a '0' character if the integer was less than 10.
*/ */
protected String getDigitsAsString(int i) protected String getDigitsAsString(int i)
{ {
String str = Integer.toString(i); String str = Integer.toString(i);
if (i < 10) if (i < 10)
str = "0" + str; str = "0" + str;
return str; return str;
} }
/** /**
* A method to update the time displayed in the ClockView window. * A method to update the time displayed in the ClockView window.
*/ */
public void refreshTimeDisplay() public void refreshTimeDisplay()
{ {
Timestamp t = new Timestamp(); Timestamp t = new Timestamp();
t.fillTimes(); t.fillTimes();
String display = getDigitsAsString(t.hrs) + ":" + String display = getDigitsAsString(t.hrs) + ":" +
getDigitsAsString(t.mins) + ":" + getDigitsAsString(t.mins) + ":" +
getDigitsAsString(t.secs) + " " + getDigitsAsString(t.secs) + " " +
t.am_pm; t.am_pm;
tLabel.setText(" " + display); tLabel.setText(" " + display);
tLabel.repaint(); tLabel.repaint();
} }
} }

60
cs621/proj1/Timestamp.java
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@ -1,30 +1,30 @@
/** /**
* This class holds a time value consisting of hours, minutes, and seconds. * This class holds a time value consisting of hours, minutes, and seconds.
*/ */
public class Timestamp public class Timestamp
{ {
// data fields // data fields
public int hrs; public int hrs;
public int mins; public int mins;
public int secs; public int secs;
public java.lang.String am_pm; public java.lang.String am_pm;
/** /**
* This method updates the hours, minutes, and seconds values * This method updates the hours, minutes, and seconds values
* associated with the Timestamp object. * associated with the Timestamp object.
*/ */
public void fillTimes() public void fillTimes()
{ {
java.util.Calendar now; java.util.Calendar now;
now = java.util.Calendar.getInstance(); now = java.util.Calendar.getInstance();
hrs = now.get(java.util.Calendar.HOUR); hrs = now.get(java.util.Calendar.HOUR);
hrs = hrs == 0 ? 12 : hrs; hrs = hrs == 0 ? 12 : hrs;
mins = now.get(java.util.Calendar.MINUTE); mins = now.get(java.util.Calendar.MINUTE);
secs = now.get(java.util.Calendar.SECOND); secs = now.get(java.util.Calendar.SECOND);
am_pm = now.get(java.util.Calendar.AM_PM) == java.util.Calendar.AM am_pm = now.get(java.util.Calendar.AM_PM) == java.util.Calendar.AM
? "AM" ? "AM"
: "PM"; : "PM";
} }
} }