java - java 命令的 -jar 选项的真正作用是什么

Question

java 命令的 -jar 选项是否也会在运行 main 方法之前编译源代码？ 我相信是这样，但我想更好地了解内部流程，从手册页中您可以清楚地看到一个小的工作流程序列:

-jar
             Execute a program encapsulated in a JAR file. The first argument is the name of a JAR file instead of a startup class name. In order for this option to work, the manifest of the JAR file must contain a  line  of
             the form Main-Class: classname. Here, classname identifies the class having the public static void main(String[] args) method that serves as your application's starting point. See the Jar tool reference page and
             the Jar trail of the Java Tutorial @

但它没有提到它编译源代码。

Answer 1

Does the -jar option of the java command also compile the sources before running the main method?

不，绝对不是。它只是指定 jar 文件，在该文件中查找指定主类的 list ，以及(通常)该类的类文件。它绝对不会编译任何东西。