What is the role of Project->clean in eclipse

1. Since the compilation of Eclipse is based on the time stamp judgment mechanism.
So when you press build all, some of the classes that eclipse thinks the timestamp hasn't changed will not be compiled.
So you can clean it and compile it first. At this point eclipse will clean up all the previously compiled information and compile it.
Eclipse--->project----->clean ...
option to delete the. class file in the project while recompiling the project, similar to the rebuild in Jbuild

2. So sometimes compile does not pass the reason is no project->clean caused!!!

2. So sometimes compile does not pass the reason is no project->clean caused!!!

2. So sometimes compile does not pass the reason is no project->clean caused!!!

2.

Eclipse > Project > Clean is to delete files such as the one generated by Eclipse compilation so that they can be compiled again later. Redeploy is the redeployment of the web to Tomcat, which may copy files such as JSP/HTML/CSS/JS and Web-inf directories to Tomcat or the entire project into a war copy to Tomcat.

What is the role of Project->clean in eclipse