Eclipse import of two JDK

Today want to see the source of HashMap, source code to see not very understand, want to combine online posts to see, found that many online are based on 1.6 write. and 1.8 of the source is not up, then installed jdk1.6 version, but 1.8 do not want to delete ~

1, in fact, and install the common JDK, no different;

2, but after the installation of 1.6, to be configured in a bit: add a bit

3. then create a new Java project, and note that the Java 1.6 version is selected :

Note: There can be only one JDK version under a project, so builder path is either 1.8 or 1.6,

If only to see the source, create a new project using Jdk1.6 ~ ~

4, then in the environment ctrl+shift+t, search a hashmap, such as:

Then you can have a pleasant view of the source ~ ~

Eclipse import of two JDK