KwCheng's blog

There are three ways to set Classpath.

1. Using command

Windows:

javac -cp path_1;path_2 fileName.java

java -cp path_1;path_2;. fileName

the dot , "." , means that we want to find file in current file folder.

Linux:

javac -cp path_1:path_2 fileName.java

java -cp path_1:path_2:. fileName

The separation sybmol is different between Windows and Linux .

In windows , the separation symbol is semicolon ; .

but the separation symbol is colon : in Linux environment.

if the jar file in MyLibrary.jar , and there are a directory , MyLib , in the MyLibrary.jar , 

we should import MyLib.*;

and the command for compile is : javac -cp MyLibrary.jar program.java.

( the jar file and the program.java are in the same directory now) 

2. Set Classpath variable

     在windows 控制台 / 系統 / 環境變數下 , 設定CLASSPATH變數 , 並將jar file的路徑輸入到CLASSPATH variable中.

3. using Java property file