Java开发网 - [Java SE] 需要把tools.jar和rt.jar加到Classpath中吗？

Topic: [Java SE] 需要把tools.jar和rt.jar加到Classpath中吗？

1.[Java SE] 需要把tools.jar和rt.jar加到Classpath中吗？

Posted by: why
Posted on: 2006-04-30 19:38

extracted from : http://www.cjsdn.net/post/view?bid=1&id=80536

Jove wrote:
jdk只会加载rt.jar
如果你的程序需要动态调用javac,就把tools.jar加上

C:\>java -verbose
[Opened E:\Java\j2sdk1.4.2_02\jre\lib\rt.jar]
[Opened E:\Java\j2sdk1.4.2_02\jre\lib\sunrsasign.jar]
[Opened E:\Java\j2sdk1.4.2_02\jre\lib\jsse.jar]
[Opened E:\Java\j2sdk1.4.2_02\jre\lib\jce.jar]
[Opened E:\Java\j2sdk1.4.2_02\jre\lib\charsets.jar]
[Loaded java.lang.Object from E:\Java\j2sdk1.4.2_02\jre\lib\rt.jar]
[Loaded java.io.Serializable from E:\Java\j2sdk1.4.2_02\jre\lib\rt.jar]
[Loaded java.lang.Comparable from E:\Java\j2sdk1.4.2_02\jre\lib\rt.jar]
[Loaded java.lang.CharSequence from E:\Java\j2sdk1.4.2_02\jre\lib\rt.jar]
[Loaded java.lang.String from E:\Java\j2sdk1.4.2_02\jre\lib\rt.jar]
[Loaded java.lang.Class from E:\Java\j2sdk1.4.2_02\jre\lib\rt.jar]
[Loaded java.lang.Cloneable from E:\Java\j2sdk1.4.2_02\jre\lib\rt.jar]
[Loaded java.lang.ClassLoader from E:\Java\j2sdk1.4.2_02\jre\lib\rt.jar]
...

不妨认识一下 %JAVA_HOME%\lib 底下的 tools.jar 和 dt.jar 是甚么咚咚，需要不需要：
http://java.sun.com/j2se/1.4.2/docs/tooldocs/windows/jdkfiles.html
http://java.sun.com/j2se/1.5.0/docs/tooldocs/windows/jdkfiles.html

又，如果不明白是否“程序需要动态调用javac”，那就当作不需要；IDE自己默认设定，阁下也默认好了。

c:\jdk1.5.0\lib
Files used by the development tools. These include tools.jar, which
contains non-core classes for support of the tools and utilities in the JDK.
Also includes dt.jar, the DesignTime archive of BeanInfo files that tell
interactive development environments (IDE's) how to display the Java
components and how to let the developer customize them for the application.

               jdk1.5.0
        ___________|____________________
       |           |                    |
      bin         lib                  jre
       |           |          __________|_____________________
   java.exe    tools.jar     |                                |        
   javac.exe   dt.jar       bin                              lib                
   javap.exe            _____|____ __________         ________|_______ ________ ________        
   javah.exe           |          |          |       |        |       |        |        |
   javadoc.exe     java.exe    client      server  rt.jar    ext  security  applet    fonts
                   java.dll       |          |   charsets.jar |                  
                   awt.dll     jvm.dll    jvm.dll        localedata.jar

2.Re:[Java SE] 需要把tools.jar和rt.jar加到Classpath中吗？ [Re: why]	Copy to clipboard
Posted by: pchj200606 Posted on: 2006-06-08 09:18 sun 为什么还要搞jdk和jre两个目录啊？高手请进来。

3.Re:[Java SE] 需要把tools.jar和rt.jar加到Classpath中吗？ [Re: why]	Copy to clipboard
Posted by: gip Posted on: 2006-06-12 23:31 ...jdk是开发用的，jre是运行用的，开发的要大很多。

4.Re:[Java SE] 需要把tools.jar和rt.jar加到Classpath中吗？ [Re: why]	Copy to clipboard
Posted by: davidpike Posted on: 2006-06-24 21:49 讲得很好！知识应该大家分享。

5.Re:[Java SE] 需要把tools.jar和rt.jar加到Classpath中吗？ [Re: why]	Copy to clipboard
Posted by: 藤真 Posted on: 2006-07-30 15:20 好呀，知道了。。。

6.Re:[Java SE] 需要把tools.jar和rt.jar加到Classpath中吗？ [Re: why]	Copy to clipboard
Posted by: figoee Posted on: 2006-08-27 10:00 了解……

7.Re:[Java SE] 需要把tools.jar和rt.jar加到Classpath中吗？ [Re: why]	Copy to clipboard
Posted by: cooper1919 Posted on: 2008-06-25 20:04 很有用的东西,谢谢了