...功能和API设置为Eclipse
SDK的下一个功能版本，3.7之后，指定版本4.2和代号为Juno。这个
版本与3.8平台版本同时发生。
4.2版本是一个成熟的平台版本，包含重要的新
功能工作，而3.8版本的重点是稳定性和错误
修复。

来自： http：// www .eclipse.org / projects / project-plan.php？projectid = eclipse

此外，Java 7的支持开始于3.7.1：

https：//bugs.eclipse。 org / bugs / show_bug.cgi？id = 288548

Eclipse Indigo is 3.7, and Eclipse Juno is 4.2, but 3.8M1 has just been released. What's 3.8 and how is this different from 3.7? I'm eagerly awaiting Java 7 support and am confused whether I should use 3.8M1 or wait for 3.7.1

...the feature and API set for the next feature release of the Eclipse SDK after 3.7, designated release 4.2 and code-named Juno. This release is occurring simultaneously with the 3.8 platform release. The 4.2 release is a mature platform release containing significant new feature work, while the 3.8 release focuses on stability and bug fixes.

From: http://www.eclipse.org/projects/project-plan.php?projectid=eclipse

Also, Java 7 support began with 3.7.1:

https://bugs.eclipse.org/bugs/show_bug.cgi?id=288548