How do I add package level annotations or edit pac

问题:

I'm trying to add package level annotations but I don't have a clue on how to do it. Examples are appreciated.

回答1:

Summary from the article here

In package-info.java:

@PackageLevelAnnotation
package blammy; // package with a package level annotation.


import blammy.annotation.PackageLevelAnnotation;

In PackageLevelAnnotation.java

package blammy.annotation;

@Retention(RetentionPolicy.CLASS)
@Target(ElementType.PACKAGE)
public @interface PackageLevelAnnotation
{
  // stuff as required.
}

Edit: more package level info. Here is a link to the package chapter in the Java Language Spec: packages

回答2:

In eclipse

Since package-info.java isn't a valid identifier for a class it cannot be created as a class in Eclipse.

I found that when you create a new package there is a check box to check if you want a package-info.java.

To create a package-info.java file in an existing package:

1. Right-click on the package where you want a package-info.java.
2. Select New->Package.
3. Check the Create package-info.java check box.
4. Click on Finish.

回答3:

Open explorer, go to src/your package folder.
right click -> Create new textfile: name it package-info.java.

Go back to eclipse and edit and add the desired content.

回答4:

The package-info.java is a Java file that can be added to any Java source package. Its purpose is to provide a home for package level documentation and package level annotations. Simply create the package-info.java file and add the package declaration that it relates to in the file. In fact, the only thing the package-info.java file must contain is the package declaration.