step one :安装exe文件,如jdk-6u24-windows-i586.exe
step two :配置环境变量
step two-one : name:JAVA_HOME value:jdk安装路径 (for example: C:\Program Files\Java\jdk1.6.0_24) (attention : 不要以;号结尾) step two-two : name:Path value:%JAVA_HOME%\bin;%JAVA_HOME%\jre\bin; (attention : 一定要以;号结尾) step two-three : name:CLASSPATH value:%JAVA_HOME%\lib;%JAVA_HOME%\lib\tools.jar; (attention : 一定要以;号结尾)step three :打开cmd,输入java,如有帮助信息,恭喜你,配置成功了!