Java Language Tutorial => Classpath path syntax

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The classpath is a sequence of entries which are directory pathnames, JAR or ZIP file pathnames, or JAR / ZIP wildcard specifications.

For a classpath specified on the command line (e.g. -classpath) or as an environment variable, the entries must be separated with ; (semicolon) characters on Windows, or : (colon) characters on other platforms (Linux, UNIX, MacOSX and so on).
For the Class-Path element in a JAR file's MANIFEST.MF, use a single space to separate the entries.

Sometimes it is necessary to embed a space in a classpath entry

When the classpath is specified on the command line, it is simply a matter of using the appropriate shell quoting. For example:
```
export CLASSPATH="/home/user/My JAR Files/foo.jar:second.jar"
```
(The details may depend on the command shell that you use.)
When the classpath is specified in a JAR file's a "MANIFEST.MF" file, URL encoding must be used.
```
 Class-Path: /home/user/My%20JAR%20Files/foo.jar second.jar
```

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