在线时序图:http://webchart.ihuhai.cn/
jdk历史版本路径: http://www.oracle.com/technetwork/java/archive-139210.html
jdk1.1的下载路径: http://www.oracle.com/technetwork/java/javasebusiness/downloads/java-archive-downloads-javase11-419415.html
jdk1.2的下载路径:http://www.oracle.com/technetwork/java/javasebusiness/downloads/java-archive-downloads-javase12-419414.html
jdk1.3的下载路径:http://www.oracle.com/technetwork/java/javasebusiness/downloads/java-archive-downloads-javase13-419413.html
jdk1.4的下载路径:http://www.oracle.com/technetwork/java/javasebusiness/downloads/java-archive-downloads-javase14-419411.html
jdk7的下载路径:http://www.oracle.com/technetwork/java/javase/downloads/java-archive-downloads-javase7-521261.html