为什么java -version返回旧版本? [英] Why does java -version return an old version?

问题描述

操作系统:Windows XP

OS: Windows XP

我正在使用 yuicompressor-2.4.2 压缩一些CSS，然后再上传到我的服务器.但是当我运行它时，出现以下异常:

I am using yuicompressor-2.4.2 to compress some CSS before uploading to my server. But when I run it, the following exception appears:

Exception in thread "main" java.lang.UnsupportedClassVersionError:
com/yahoo/platform/yui/compressor/Bootstrap (Unsupported major.minor version 48.0)

所以我认为这是因为JRE.
我输入了命令:

So I think it's because of the JRE.
I typed in the command:

cmd: java -version

它说:

java version "1.3.1_01"

但是应该说 1.6.0_16 ，因为我已经安装了最新版本.

But it should say 1.6.0_16, since I have installed the latest version.

我应该怎么做才能使Java使用最新版本而不是旧版本?

What should I do to make Java use the latest version instead of the old one?

推荐答案

设置环境变量JAVA_HOME指向jdk 1.6.0所在的目录

Set the environment variable JAVA_HOME pointing to the directory where you have jdk 1.6.0

set JAVA_HOME=your_path_to_jdk1.6
set PATH=%JAVA_HOME%/bin;.;..;%PATH%

是在命令窗口中.您也可以从我的电脑>属性>高级>环境变量"中完成此操作

That's from a command window. Also you can do it from "My PC > Properties > Advanced > Environment variables"

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