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This article is to share with you about how java looks at the loading order of jar packages. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

Check the jar package loading order to see which jar the specific class is loaded from.

When JVM starts, add the following parameters:

-verbose:class

And then, oh, there will be the following output

[Loaded java.util.regex.Pattern from / Library/Java/JavaVirtualMachines/jdk1.7.0_80.jdk/Contents/Home/jre/lib/rt.jar]

The loading order of classes in the jar package (class name conflict) javac is used to compile * .java files

If there are classes introduced by import in the .java file, they are also needed at compile time, otherwise an error is reported.

Javac-cp a.jarterb.jar; xxxx.java under windows, multiple jar packages are separated by semicolons

If both a.jar and b.jar have class com.A. So when you execute java-cp a.jarterb.jarter.jartens. / XXX, which jar package comes first will load the classes in the jar package.

It has something to do with the loading mechanism of the class. Custom classes are all loaded by AppClassLoader, and a class can only be loaded once with the same loader.

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