Step 1:
新建project:
File -> New -> Project (empty Activity)
Step 2:
New module:
File -> New -> New Module -> Java Library (我这里命名为HelloJava）
Step 3:
Java code:
HelloJava -> myClass（点击打开编写Java代码）
Step 4:
Configurations:
Run -> Edit Configuration ->
Step 5:
Run:(click the highlight button)
Java 小白袭来......