Skip to content

Latest commit

 

History

History
44 lines (23 loc) · 2.4 KB

jdk.md

File metadata and controls

44 lines (23 loc) · 2.4 KB

JDK (Java Development Kit)

Class Path

  • Setting the Class Path #ril

    Synopsis

    • The CLASS SEARCH PATH (CLASS PATH) can be set using either the -classpath option when calling a JDK tool (the preferred method) or by setting the CLASSPATH environment variable.

      The -classpath option is PREFERRED because you can set it individually for each application WITHOUT AFFECTING other applications and without other applications modifying its value.

      sdkTool -classpath classpath1:classpath2...

setenv CLASSPATH classpath1:classpath2...

    • sdkTool

      A command-line tool, such as java, javac, javadoc, or apt. For a listing, see JDK Tools and Utilities at http://docs.oracle.com/javase/8/docs/technotes/tools/index.html

      原來 JDK 所有工具都支援 class path 的設定!

    • classpath1:classpath2

      Class paths to the JAR, zip or class files. Each class path should end with a file name or directory depending on what you are setting the class path to, as follows:

      • For a JAR or zip file that contains class files, the class path ends with the name of the zip or JAR file.

      • For class files in an UNNAMED PACKAGE, the class path ends with the directory that contains the class files.

      • For class files in a NAMED PACKAGE, the class path ends with the directory that contains the ROOT PACKAGE, which is the first package in the full package name.

        這裡 named & unnamed package 的 directory，差別在於前者只會有子資料夾 (對應 root package)，後者只含 class file，不會有子資料夾。

      Multiple path entries are separated by semicolons with no spaces around the equals sign (=) in Windows and colons in Oracle Solaris. 等號會用在哪裡??

    • The default class path is the CURRENT DIRECTORY. Setting the CLASSPATH variable or using the -classpath command-line option OVERRIDES that default, so if you want to include the current directory in the search path, then you must include a dot (.) in the new settings.

      Class path entries that are neither directories nor archives (.zip or JAR files) nor the asterisk (*) wildcard character are ignored.

參考資料 {: #reference }

手冊：