‘壹’ 我想下载不同版本的java。在官网上
现在官网上只能下到6和7版本的
http://www.oracle.com/technetwork/java/javase/downloads/index.html
Java SE 7u21
This release includes important security fixes. Oracle strongly recommends that all Java SE 7 users upgrade to this release.
http://www.oracle.com/technetwork/java/javase/downloads/jdk7-downloads-1880260.html
Java SE 6u45
This release brings in security features and bug fixes. Oracle strongly recommends that all Java SE 6 users upgrade to this release. Learn
http://www.oracle.com/technetwork/java/javase/downloads/jdk6downloads-1902814.html
‘贰’ 如何安装 java 旧版本
关键在于环境变量。
你下载好免安装版的JDK，然后环境变量中java_home配置到这个目录，同时path也配置到相应的目录。
打开cmd，键入:java -version 检验一下版本就OK了。
‘叁’ Java软件旧版本，哪里有下载
http://java.com/zh_CN/download/help/auto_install.xml 这是个1.4.2的,不知道可以不