java JDK JRE 1.6,1.7,1.8 version download link

Sometimes it is not easy to find a certain version of jdk, here are all the links and the corresponding api

java SE 1.6 various versions jdk api

http://www.oracle.com/technetwork/java/javase/downloads/java-archive-downloads-javase6-419409.html

java SE 1.7 various versions jdk api

http://www.oracle.com/technetwork/java/javase/downloads/java-archive-downloads-javase7-521261.html

java SE 1.8 various versions jdk api

http://www.oracle.com/technetwork/java/javase/downloads/java-archive-javase8-2177648.html