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Easy Learn Java: Programming Articles, Examples and Tips - Page 36


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How can I check CLASSPATH variable on my OS?

Go to all tips in General Java

Question: How can I check CLASSPATH variable on my OS?

Answer: The CLASSPATH environment variable tells the Java Virtual Machine and other Java applications where to find all the class libraries.

User-defined class libraries also defined by the CLASSPATH variable.

Open Command prompt in Windows and type: echo %CLASSPATH%

In Linux, Unix or MAC OSX in any shell: echo $CLASSPATH

Default class path

If the CLASSPATH environment varialbe is not set, the following default class path will be used:
   .:[bin]/../classes:[bin]/../lib/classes.zip
All the entries in this line are ":" separated...

The dot, ., represents the current directory. The symbol [bin] stands for the absolute path to the jdk1.1.x/bin directory. Therefore, if you keep the bin and lib directories at the same directory level, the Java executables will find the JDK classes (contained in the classes.zip file). Note that the default class path also includes a path to a classes directory on the same directory level as bin and lib. You can put your own (unzipped) class files in a classes directory that you create, and the Java executables will be able to find them with the default CLASSPATH.

Setting your CLASSPATH: fast receipt here!

You need to set the CLASSPATH if you move the JDK's classes.zip file or if you want to load a class library that's not in a location specified by the default CLASSPATH. To set CLASSPATH, use the setenv command.

And you unset your CLASSPATH in just one short command like this:

   unsetenv CLASSPATH
You need unset if your CLASSPATH environment variable has been set to a value that is not correct, or if your startup file or script is setting an incorrect path.
This command unsets only CLASSPATH's current value. You should also delete or modify the lines in your startup file that may be setting an incorrect CLASSPATH.

19 comments | Printer Friendly Page  Send to a Friend | Score: 5
Posted by jalex on Wednesday, March 26, 2003 (00:00:00) (24397 reads)

Properties class inherited from Hashtable... Does it mean that I can use ''non-s

Go to all tips in Text processing

Question: Properties class inherited from Hashtable... Does it mean that I can use "non-string" keys and values?

Answer: Not really. Why?
I think best answer for this question can be found in API:

"The Properties class represents a persistent set of properties. The Properties can be saved to a stream or loaded from a stream. Each key and its corresponding value in the property list is a string.
A property list can contain another property list as its "defaults"; this second property list is searched if the property key is not found in the original property list.

Because Properties inherits from Hashtable, the put and putAll methods can be applied to a Properties object. Their use is strongly discouraged as they allow the caller to insert entries whose keys or values are not Strings. The setProperty method should be used instead. If the store or save method is called on a "compromised" Properties object that contains a non-String key or value, the call will fail.

When saving properties to a stream or loading them from a stream, the ISO 8859-1 character encoding is used. For characters that cannot be directly represented in this encoding, Unicode escapes are used; however, only a single 'u' character is allowed in an escape sequence. The native2ascii tool can be used to convert property files to and from other character encodings."

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All published and not published on site tips you can find here



8 comments | Printer Friendly Page  Send to a Friend | Score: 0
Posted by jalex on Tuesday, March 25, 2003 (00:00:00) (4576 reads)

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