garbage-collection

问题 say I have the javascript: /*getAttribute is mootools method for retrieving a named attribute*/ var companyNumber = button.getAttribute('data-company-number'); var payPoint = button.getAttribute('data-pay-point'); window.location = '/Payslip/ListPayslips/?companyNumber=' + companyNumber + '&payPoint=' + payPoint delete payPoint;//is this necessary? delete companyNumber;//is this necessary? Would the delete lines be necessary? And would they even get called? 回答1: To answer the first question,

问题 I'm very curious about how this thing works inside Android. I have a class with two List<> inside, instantiated at runtime and loaded with objects created while reading some data, I want to know what happens with those Lists in this situation: Class A has List B and List C with many other initialized objects inside. Another different class get a reference of List C from a method of Class A, like public List<myObject> GetList() . Somewhere in code, Class A is no longer used and application

问题 I am a bit confused on when fixed block is required. I have example which gives me a contradicting scenario below: enum RoomType { Economy, Buisness, Executive, Deluxe }; struct HotelRoom { public int Number; public bool Taken; public RoomType Category; public void Print() { String status = Taken ? "Occupied" : "available"; Console.WriteLine("Room {0} is of {1} class and is currently {2}", Number, Category, status); } } I have made a function which will take a pointer to a HotelRoom private

问题 for statement rs.getString("name") //rs is java.sql.ResultSet interface bytecode is: 41: aload 4 43: ldc #10; //String name 45: invokeinterface #11, 2; //InterfaceMethod java/sql/ResultSet.getString:(Ljava/lang/String;)Ljava/lang/String; 50: pop At line 45 returned string object by rs.getString("name") is pushed onto stack and at line 50, return object (a string object) is poped up. 1)Does stack contain only reference to this returned string object with actual object on heap OR stack contains

问题 What are alternatives to "free" this object? it normally happens when call the .Exit() method is called, but in this case, I can't do this because the user that should close the word application instance. I thought to do wordApp = null or call GC.Collect(); what's the best solution and why? thanks in advance. I'm using this currently: public static void Free() { if (wordApp != null) { System.Runtime.InteropServices.Marshal.ReleaseComObject(wordApp); GC.Collect(); } } 回答1: The most aggressive

问题 for statement rs.getString("name") //rs is java.sql.ResultSet interface bytecode is: 41: aload 4 43: ldc #10; //String name 45: invokeinterface #11, 2; //InterfaceMethod java/sql/ResultSet.getString:(Ljava/lang/String;)Ljava/lang/String; 50: pop At line 45 returned string object by rs.getString("name") is pushed onto stack and at line 50, return object (a string object) is poped up. 1)Does stack contain only reference to this returned string object with actual object on heap OR stack contains

问题 I have a java.nio.channels.ServerSocketChannel which I initialised as follows: while(true) { ServerSocketChannel channel = ServerSocketChannel.open(); InetSocketAddress serverSocket = new InetSocketAddress(host,port); channel.bind(serverSocket); SocketChannel ch = channel.accept(); // Later on when I have read off data from a client, I want to shut this // connection down and restart listening. channel.socket().close(); //Just trying to close the associated socket // too because earlier

问题 Is it necessary to manually manage the lifetime of System.Drawing objects? Currently I am employing 'using' statements to minimise the lifespan of Brushes and other Drawing objects e.g. using ( Brush br = new SolidBrush( color ) ) { // Do something with br } Is this necessary or is it safe to let the garbage collector work its magic when and if it needs to? As a quick aside to the question... what do people think is the cleanest way to achieve this? 回答1: It is good to Dispose of System

问题 I am using a bunch of ConcurrentLinkedQueue s in my application and the GC overhead is huge. How do I check if the ConcurrentLinkedQueue is the culprit? Is there a standard way in Java to profile these data structures for memory allocation/deallocation? 回答1: One way to do it is to write a simple test program and run it with the -verbose:gc JVM option. For example, the code: import java.util.concurrent.ConcurrentLinkedQueue; public class TestGC { public static void main(String[] args) throws

问题 Consider the following class: public ref class Workspace { protected: Form^ WorkspaceUI; SplitContainer^ WorkspaceSplitter; AvalonEditTextEditor^ TextEditor; ScriptOffsetViewer^ OffsetViewer; SimpleTextViewer^ PreprocessedTextViewer; ListView^ MessageList; ListView^ FindList; ListView^ BookmarkList; ListView^ VariableIndexList; TextBox^ VariableIndexEditBox; Label^ SpoilerText; ToolStrip^ WorkspaceMainToolBar; ToolStripButton^ ToolBarNewScript; ToolStripButton^ ToolBarOpenScript;