Every time you want to open some java source code in eclipse, it is always troublesome. You need to find the location of the jar package, and then use the decompiler tool to view it. After thinking about it, you should install a decompiler plug-in in eclipse. The steps are also very simple
1. Download the net.sf.jadclipse_3.3.0.jar package from the sourceforge.net/projects/jadclipse/ website , copy it to the plugins directory of eclipse, and delete the org.eclipse.update file in the configuration directory of eclipse. This file can be safely deleted without hesitation, and then you can restart eclipse.
2. Go to http://varaneckas.com/jad/ to download the compressed package of jad, it may fail to download, then I go to http://download.csdn.net/download/loocao/2193548 to download it, the download is good Then just unzip it.
3. Open eclipse 
4. Set the default opening method of *.class file type
5. Set the opening method of *.class without source file type
Click Finish, and then you can view the source code happily, as shown in the figure
