java info是什么_什么是package-info.java
在java項(xiàng)目中創(chuàng)建package以后，可以在package下放一個(gè)package-info.java文件。
這個(gè)文件有什么作用？如何生成？
三個(gè)作用：
為標(biāo)注在包上Annotation提供便利；
聲明友好類和包常量；
比如一個(gè)包中有很多的內(nèi)部訪問(wèn)的類或常量，就可以統(tǒng)一的放到package-info類中，這樣就方便，而且集中管理，減少friendly類到處游走的情況，看例子：
//這里是包類，聲明一個(gè)包使用的公共類，強(qiáng)調(diào)的是包訪問(wèn)權(quán)限
class PkgClass{
public void test(){
}
}
//包常量，只運(yùn)行包內(nèi)訪問(wèn)，適用于分“包”開(kāi)發(fā)
class PkgConst{
static final String PACAKGE_CONST="ABC";
}
提供包的整體注釋說(shuō)明。
Package Documentation Prior to Java 5, package level documentation (the documentation shown in Javadocs for a package) was placed in package.html. Today, the description and other related documentation for a package can be written up in the package-info.java file and it gets used in the production of the Javadocs. As a demonstration, the example package-info.java…
/**
* Domain classes used to produce the JSON and XML output for the RESTful services.
*
* These classes contain the JAXB annotations.
*
* @since 1.0
* @author jwhite
* @version 1.1
*/
package com.intertech.cms.domain;
… results in the following Javadocs.
package-info.java’s purpose 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.
如何創(chuàng)建：
參考
總結(jié)
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