The difference and effect of Folder,source folder,package under Eclipse

First of all, Folder,source Folder,package is a folder, since it is a folder, then any file can go to these three kinds of folders below the place.
1. The difference between them
folder is a normal directory, and it doesn't have any difference from the folder we use under Window
The source folder is a special folder, if you use object-oriented thinking to see the source folder, then he is a subset of folder, as a subset, it must have all the functions of the folder, but also has its own special features, his special place, Is the Java file under the source folder will be compiled, the compiled file will be placed under a folder we set (generally we set to web-inf/classes), source Folder below the non-Java files will be copied a copy in our settings under the folders, for the way to set:

The package folder is also a special folder, and what is special about him is that he must exist under the source folder and pass through the hierarchy . To differentiate, his path finally consists of the package path name of each class, such as:

2. Their role
Folders is the most common folder, and any files you want to put under eclipse can be placed under folder

Source folder is designed to be used to put the Java files to be compiled, because the Java file to be compiled first, then there is a problem, then the folder can be compiled? Can't be compiled under that folder? So design a special folder called the source, the Java file below him can be compiled, and, you can use a certain configuration to put the compiled files under the folder you configured

Package, designed to give Java files to subcontract, plainly, is to manage Java files, if the source folder as a building, then we are through the package of the building into different floors, different rooms, Different floors different rooms we used to do different things, the room put a lot of Java class, one thing to note is that the final package made up a path name, this path name is not a physical path, but Java, there are many times, is the package with the path name, such as: Web.xml,spring.xml and many other configurations

Conversion of 3.package,source Folder,folder to each other
Package turns into folder display: Select Package, Build path-> Exclude
Folder turns into package display: Select folder, Build path-> Include

Package turns to source folder display: Select Package, build path-> use as source folder
source folder turns into package display: Select folder, Build path-> Remove from BuildPath

Conversion of Pacage to source folder ibid.

The difference and effect of Folder,source folder,package under Eclipse