如何从Eclipse中的包中导入类？

Question

I have a package folder called snake with .java files and I am trying to import a specific class from it for example Move .

I have placed the folder into the same project folder as the src folder I am currently working with, but when I tried to do an import snake.Move; I get an error message saying that the import cannot be resolved .

Did I store the folder in the wrong directory? Or am I missing a step?

Answer 1

Make sure your .java files are registered in a package that has the same name as the folder you use inside the src Eclipse project folder.

In other words, they have to start with:

package snake;

.. if they are located in the src/snake folder.

Your source files need to be in what Eclipse calls a Source Folder . By default, for a new java project, src is created and marked as source folder. If you've just pasted the folder with your sources from the filesystem into the project folder, you will see that in Eclipse, src and you folder look differently ( src has some brown blocks in it, marking it as a source folder). You need to register your folder as a source folder as well.

You have 2 methods to set source folders:

1. Right click on your project and select New > Source Folder and enter the name of your simple folder. Once you click Finish, you will see your regular folder be marked just like src is and properly registered as a source folder.
2. Right click on your project and select Properties then select the tab Java Build Path and the first sub-tab Sources . There you can see the currently registered source folders and you can press Add Folder to register some more folders (from your project's main folder) as source folders.

However, keep in mind that it's generally easier and a best practice to have only 1 source folder, which is src and to put all your code inside it, organized by packages.

Answer 2

Package folder should be inside the same directory as the java file importing it.

so if the main.java importing the snake package they should have the same path

src/snake

src/game.java

If they are not in the same folder than better keep them in the same folder(If it is fine with your program) cause it's easier that way.

Answer 3

在src文件夹下创建一个名为“ snake”的文件夹，然后将您的移动文件放在此处