亚洲精品成人久久,亚洲国产日韩精品,国产亚洲精品影视在线产品

Sat, 03 Sep 2016 01:37:00 GMT

以下单例实现思想来自《Java Design Patterns: A Programmer's Approach�?
该方法利用了Java�~�省的Lazy�c�d��例化机制克服了传�l�单例模式实��C��Lazy实例化方式的不��?br />

public class Singleton {
   private Singleton(){}

   public static Singleton getInstance(){
      return Helper.instance;
   }

   static class Helper {
       private static Singleton instance = new Singleton();
   }
}

软�g工程实践�?/a> 2016-09-03 09:37 发表评论

Fri, 02 Sep 2016 07:52:00 GMT

以下转自StackOverflow�Q?a >http://stackoverflow.com/questions/5074063/maven-error-failure-to-transfer�Q�，亲测可用�?br />

This worked for me in Windows as well.

Locate the {user}/.m2/repository (Using Juno /Win7 here)
In the Search field in upper right of window, type ".lastupdated". Windows will look through all subfolders for these files in the directory. (I did not look through cache.)
Remove them by Right-click > Delete (I kept all of the lastupdated.properties).
Then go back into Eclipse, Right-click on the project and select Maven > Update Project. I selected to "Force Update of Snapshots/Releases". Click Ok and the dependencies finally resolved correctly.

软�g工程实践�?/a> 2016-09-02 15:52 发表评论

Groovy:Invalid duplicate class definition of class....The type xxx is already defined..

Wed, 31 Aug 2016 01:00:00 GMT

当我们写Groovy脚本代码的时候，有时会发生编译错误，如下�Q?br />

- Groovy:Invalid duplicate class definition of class XXX : The source XXXX\XXX.groovy contains at least two

definitions of the class XXX.

- The type XXX is already defined

原因在于Groovy会把.groovy代码文�g作�ؓ脚本或类定义来处理，例如如下代码�Q?br />
class Order {
    def security
    def value
    private buy_sell(su, closure) {
        security = su[0]
        quantity = su[1]
        closure()
    }
    def getTo() {
        this
    }
}
def methodMissing(String name, args) {
    order.metaClass.getMetaProperty(name).setProperty(order, args)
}
def getNewOrder() {
    order = new Order()
}

Integer.metaClass.getShares = { -> delegate }

Groovy会把上述代码作�ؓ脚本处理�Q�同时缺省用文�g名来作�ؓ一个外围类�c�d��括整个脚本程序，此时�Q�如果该文�g名恰好也是Order的话�Q�那么就会出现重复的�c�d��义错误提�C��?br />解决办法是将脚本文�g名取另外一个不同的名字�?/div>

软�g工程实践�?/a> 2016-08-31 09:00 发表评论

OMG OCUP2考试通知

Tue, 30 Aug 2016 06:10:00 GMT

已经甌��OCUP中��考试的学员可以在一�q�内�Q�截止到17�q?月䆾�Q�免费申请OCUP2中��考试的资��|��原有考试仍可以参加）。此外，2014�q?月䆾之后参加了原有OCUP中��认证考试的学员可以免费申请OCUP2中��认证考试。详见OMG�|�站声明�Q?/span>http://www.omg.org/ocup-2/exam-info.htm�Q��?/a>

软�g工程实践�?/a> 2016-08-30 14:10 发表评论