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　　　　　　　　　　　Asking while Reading 　　　　　　　　　　——读Java垃圾收集器与内存分配策略 Java与C++之间有一堵由内存动态分配和垃圾收集技术所围成的“高墙”，墙外面的人想进去，墙里面的人却想出来。 为什么要了解垃圾回收？ 　　当需要排查各种内存溢出、内存泄漏问题的时候，当垃圾回收成为了系统达到更高并行量的瓶颈的时候，我们就需要根据情况（往往是根据硬件和程序 以及它们在各种垃圾回收算法下运行的情况）选择恰当的垃圾回收方式，作出必要的监控和调节。 哪些内存需要回收？ 换一句话来说：哪些内存可以回收，哪些内存又值得回收；可以回收明确我们的执行范围，而回收价值明确我们的主要目标，当然这不是一定的， 对每个项目都可能有不同的着眼点，这也是我们要理解垃圾回收方法与过程的原因。 Java堆和方法区与栈不同，一个接口中的多个实现类需要的内存可能不一样，一个方法中的多个分支需要的内存也可能不一样，我们只有在程序处于运 行期间时才能知道会创建哪些对象，这部分内存的分配和回收都是动态的，垃圾回收器关注的是这部分内存。 　　 方法区也需要回收吗？ 方法区可以不回收，因为Java虚拟机规范中说过不要求虚拟机在方法区中实现垃圾收集，更重要的原因是其性价比一般较低，原因如下： 我们知道对方法区的收集集中在对常量、无用的类的收集。 　　1） 效率：常规一次垃圾收集可以回收70

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I'm creating a contact form to send an email to a specified address. I'm trying to utilize CakePHP model validations and since I don't need a table for the contact model, I've set useTable to false in the contact model. Yet I'm getting an error in the controller function that does the sending. The error is Missing Database Table Error: Database table contacts for model Contact was not found. pointing to the line that makes the first call to $this->Contact: $this->Contact->validates( $this->data ); I thought this was all good to go with the

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: The problem is that the messagebox with "sure you wanna close?" does pop up, but when I click "no", it still proceeds to close the program. Any suggestions? Here's my code: protected override void OnFormClosing(FormClosingEventArgs e) { CloseCancel(); } public static void CloseCancel() { const string message = "Are you sure that you would like to cancel the installer?"; const string caption = "Cancel Installer"; var result = MessageBox.Show(message, caption, MessageBoxButtons.YesNo, MessageBoxIcon.Question); if (result == DialogResult.Yes)

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: Say I have my Emacs window split into multiple tiles, e.g.: --------------------------- | | | | | | --------------------------- | | | | --------------------------- When I switch between tiles (aka windows in Emacs) to edit my files (e.g. using C-x o ), I can see on which tile I am by visually locating the cursor (point) on the screen and checking the difference in shading in the status bar of each tile: However, locating the cursor on a large screen is not easy AND the difference in shading on the status bar where the cursor is is almost

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I'm developing an Android app, which I therefore endlessly build and install on my test device. Since a couple days I get with every build/install a question asking Google may regularly check installed apps for potentially harmfull behaviour. Learn more in Google Settings > Verify apps. I get the option to Accept or Decline. I've declined about a hundred times now, but it seems to be Googles policy to keep on asking until I get sick of the message and finally click Accept. But I don't want that! So my question: how do I let Google know once

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: Since the latest version, Android Studio is annoying me that It is strongly recommended that you update Gradle to version 2.14.1 or later. But it ignores it and it pops up over and over again. Is there any trick to get rid of it? 回答1: This dialog should store: <component name="PropertiesComponent"> ... <property name="show.do.not.ask.upgrade.gradle.plugin.version" value="2.2.0" /> ... </component> in your .idea/workspace.xml file. As you can see it seems to be version specific, hope this helps. If you clicked Don't remind me again for this

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 由 翻译 强力驱动 问题: This question already has an answer here: Non-static members not accessible in static function 4 answers here is my createdialogparam function which is calling DialogProc function from here- HRESULT AMEPreviewHandler :: CreatePreviewWindow () { assert ( m_hwndPreview == NULL ); assert ( m_hwndParent != NULL ); HRESULT hr = S_OK ; m_hwndPreview = CreateDialogParam ( g_hInst , MAKEINTRESOURCE ( IDD_MAINDIALOG ), m_hwndParent ,( DLGPROC ) DialogProc , ( LPARAM ) this ); / here the dialog proc function is called if ( m_hwndPreview ==

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 由 翻译 强力驱动 问题: I have freshly installed maven and while building hello world, maven keeps asking me for permission with messages like - "The applet is attempting to access the "exists" state attributes of file ..." Seems like it isn't a very common problem. Is there any way to grant these permissions to maven? [ INFO ] Scanning for projects ... [ INFO ] [ INFO ] ------------------------------------------------------------------------ [ INFO ] Building tms - server 1.0 - SNAPSHOT [ INFO ] -----------------------------------------------------------

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I have been using Instagram Subscription API to subscribe to Instagram real time updates. I have successfully subscribed to multiple subscriptions on Instagram. But now it is giving me the following error when I try to subscribe: meta": { "error_type": "OAuthAccessTokenException", "code": 400, "error_message": "The access_token provided is invalid." } Earlier it never used to ask for access token for subscription API. Can anyone please explain Instagram API. 回答1: Too old but I hope will be helpful to some people. Creating a subscription is 4

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: Is it possible to ask for no information when connecting with a google account with OAuth2 ? I tried to pass an empty scope parameter but It won't work (Usual google error page). Also, there is no list of the available parameters for scope ...For now I use scope=email . Edit: A list of scope parameters I finally found: https://developers.google.com/+/api/oauth 回答1: Sorry, you cant. As The OAuth 2.0 Authorization Framework says: If the client omits the scope parameter when requesting authorization, the authorization server MUST either process