Java包的相关问题。
我知道java包能够更方便地查看代码，但java的包还能干什么
比如说能把一个java文件中一个包的一个值调用到另个Java文佳里吗
举个例子我有个两个Java.文件Main.java和Second.java，我在Main.java中定义了一个值a为1，那么能把a的值调用到Second.java文件里吗？
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慕瓜9220888
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