System info

Environment variables, also refereed to as properties in Java, contains user settings and pointers to external data, e.g. the PATH and CLASSPATH variable. Implement an application that shows all environment variables available to Java.

Hint: System.getProperties()

ShowProperties.java

The amount of system memory is often not relevant when working inside the JVM, however the memory available in the JVM is interesting. Write a small application that uses the method in java.lang.Runtime to retrieve information about JVM memory.

ShowMemInfo.java

If you work in a graphical environment, and make GUI-applications, it would be nice to know attributes of that environment. Write an application that shows the information about the screen: width,height, bit depth and refresh rate.

Hint: java.awt.DisplayMode

ShowDisplaySettings.java

The last system resource to investigate this week, is your network, if any. Here, the most relevant information would be your IP number. Implement an application what show your current IP number or reports if there is now network available.

Hint: java.net.InetAddress

ShowIP.java

Finally, this week, you could make an application that implements all the small programs above. This would be your little Java System Information utility.