JAVA在windows下配置环境变量

设置环境变量 (共有3个环境变量：JAVA_HOME, classpath, path )
  
右键“计算机” —> 属性 —> “高级系统设置” —> “高级”选项卡 —> “环境变量”--> 系统环境变量
·······························································································
点“新建”， 变量名：JAVA_HOME
                        变量值： C:\Program Files\java\jdk1.7.0_09
和JDK的安装路径是一样的，刚才记下来，是用在这里的。输入后，确定。
·····························································································
再点“新建”， 变量名：
               classpath

                           变量值：
               .;%JAVA_HOME%\lib\dt.jar;%JAVA_HOME\lib\tools.jar;

注意！！！前面的点分号., 千万不能忘记了！！
····························································································
第三个变量不用新建，已经有了，变量名： path 按“编辑”
                   
可发现里面本来有内容，不要删除这些内容！！而是直接在已有内容的--> 前面,黏贴上如下代码：
    
.;%JAVA_HOME%\bin;

同样不要忘记前面的点分号., 还有最后的分号；
·························································································

4. 检验

开始-> 最下的搜索框里 输入 cmd 回车
输入 java ， 回车
如出现类似如何使用java之类的大段文字，则成功设置了。

zh-CN → zh

了。