Java Source Files

AboutJavaInfo.java

Copyright and other administrivia.

ColorTestCell.java

Display one system color cell.

ColorTestDialog.java

Display the defined system colors. This test is only available if your browser supports Java 1.1.

ColorTestPanel.java

Display the defined system colors. This test is only available if your browser supports Java 1.1.

ColorTestSwatch.java

Display one color blob.

EtchedBorder.java

Draw a labelled border around a component.

JavaInfo.java

This is the applet class. It computes the majority of the textual information.

Light.java

A blinking light JavaBean (from Mastering Java Beans, published by Sybex). Note: this is a debugging tool, but is not currently used.

MemoryStatus.java

Display memory status in a simple ticker-tape. MemoryStatus is closely based on StatusMemory.java by Jef Poskanzer, from his public distribution on his www.acme.com Web site. The MemoryStatus display shows the amount of memory allocated to Java applets, the amount of memory used, and the rate of change. MemoryTest is also available as a separate applet or (eventually) Java Bean.

MemoryStatusGraph.java

Display memory status in a simple ticker-tape.

MemoryStatusInfo.java

Text display for the MemoryStatus class.

UpdateIntervalPanel.java

A dialog used by the MemoryStatus and ResponseTest classes.

ResponseTest.java

This provides a very crude system response test by creating a thread that sleeps for one second. When this thread awakens, it computes the actual number of milliseconds it slept and displays this value in a "ticker-tape," along with the current maximum value. This is a crude test, and will probably be modified. ResponseTest is also available as a separate applet or (eventually) Java Bean.

ResponseTestGraph.java

This manages the ongoing response ticker-tape display.

SimpleBorder.java

Draw a one-pixel border around a color cell.

SystemInfo.java

The parent class of the information providers.

SystemLocaleInfo.java

Display information about your system's locale. This is only displayed if your browser supports Java 1.1.

SystemPropertyInfo.java

Display information provided by the System class.

SystemThreadInfo.java

Display the current set of asynchronous threads.

SystemTimeZonesInfo.java

Display information about your system's timezones. This is only displayed if your browser supports Java 1.1.

ToolkitDataInfo.java

Display information provided by the ToolKit class: the system fonts and screen data.

JavaInfo.jar

The executable class files. JavaInfo may be run as an application:
java -classpath JavaInfo.jar JavaInfo

JavaInfo.run

An execution stub that lets you run JavaInfo as an application on MacOS MRJ, using the JBindery tool in the MRJ SDK.

Bugs and Limitations

• NetScape Navigator 4.04 (on MacOS 8.0). The "System Color Info" button crashes my system. The "Beep" button does nothing and there are problems with the response test. On System 8.1, NetScape crashes, but does not crash the system.
• NetScape Navigator 4.04 (on MacOS 8.1). Daylight Savings Time changeover seems to be on the wrong date.

Bug Fixes

1998.04.30

SystemLocaleInfo "getOffset" now displays the 4-digit year, rather than the Gregorian.AD static variable appended to the 2-digit year.

1998.04.30

Revised the Daylight Savings Time change computation so it always chooses the minute before the changeover. The original computation could select the time after the changeover. Also, only compute the time to the nearest second, rather than the nearest millisecond.