zoukankan      html  css  js  c++  java
  • @PostConstruct 注解

    @PostConstruct 注解

     1 /*
     2  * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
     3  * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
     4 24  */
    25 
    26 package javax.annotation;
    27 
    28 import java.lang.annotation.*;
    29 import static java.lang.annotation.ElementType.*;
    30 import static java.lang.annotation.RetentionPolicy.*;
    31 
    32 /**
    33  * The PostConstruct annotation is used on a method that needs to be executed
    34  * after dependency injection is done to perform any initialization. This
    35  * method MUST be invoked before the class is put into service. This
    36  * annotation MUST be supported on all classes that support dependency
    37  * injection. The method annotated with PostConstruct MUST be invoked even
    38  * if the class does not request any resources to be injected. Only one
    39  * method can be annotated with this annotation. The method on which the
    40  * PostConstruct annotation is applied MUST fulfill all of the following
    41  * criteria 
    42 - The method MUST NOT have any parameters except in the case of EJB
    43  * interceptors   in which case it takes an InvocationC ontext object as
    44  * defined by the EJB   specification.
    45  * - The return type of the method MUST be void.
    46  * - The method MUST NOT throw a checked exception.
    47  * - The method on which PostConstruct is applied MAY be public, protected,
    48  * package private or private.
    49  * - The method MUST NOT be static except for the application client.
    50  * - The method MAY be final.
    51  * - If the method throws an unchecked exception the class MUST NOT be put into
    52  * service except in the case of EJBs where the EJB can handle exceptions and
    53  * even   recover from them.
    54  * @since Common Annotations 1.0
    55  * @see javax.annotation.PreDestroy
    56  * @see javax.annotation.Resource
    57  */
    58 @Documented
    59 @Retention (RUNTIME)
    60 @Target(METHOD)
    61 public @interface PostConstruct {
    62 }
  • 相关阅读:
    阅读任务-阅读笔记-4
    阅读任务-阅读提问-3
    阅读任务-阅读笔记-3
    阅读任务-阅读提问-2
    阅读任务-阅读提问-1
    构建之法:现代软件工程-阅读笔记1
    个人编程作业1-GIT应用
    《构建之法:现代软件工程-阅读笔记》
    课后作业-阅读任务-阅读提问-1
    结对编程项目作业5
  • 原文地址:https://www.cnblogs.com/sonofelice/p/5339052.html
Copyright © 2011-2022 走看看