问题
Is there a dynamic keyword in Java or a keyword which is similar to the dynamic keyword of C#
回答1:
No, there's no such thing in the Java Programming Language; it is a strictly statically typed language. There are, however, other programming languages that target the JVM, such as Groovy, that do indeed support dynamic typing.
回答2:
No, not that I know of, but having said that, there are other languages supported by the JVM that do use dynamic typing, such as Jython and I believe Groovy, and so it is possible to have your cake and eat it too, just not the particular flavor of cake that you requested above.
来源：https://stackoverflow.com/questions/7050288/dynamic-keyword-in-java