如果我的程序是使用 JDK 8 编写的，那么我的所有依赖项是否都需要使用 JDK 8 而不是 JDK 6？ 它在构建工具上与 JDK 有何不同？

Question

My intuition to the first question is yes. For the 2nd question, I did see in my work, someone use JDK8 with ANT, then compile the an old package written with JDK6 to 1.6. I got really confused.

Answer 1

Generally java is backwards compatible for all versions. See this for details.

Java SE 8 is strongly compatible with previous versions of the Java platform. Almost all existing programs should run on Java SE 8 without modification.