Browse questions answered by Jon Skeet

Convert Date to Milliseconds in Java

I need to convert a Date to its corresponding Milliseconds format.I am using getTime() method of Date class in Java for this. But the milliseond generated is not of my actual...

1416594600000 corresponds to 2014-11-21T18:30:00Z. In other words, 6.30pm on November 21st 2014 in UTC. Epoch Converter is a great resource for checking things like that. Now, a Date object doesn't have any time zone information itself.... more 7/18/2014 5:07:49 AM

How to give a blank line to an InputStream using IOUtils.toInputStream

I have code which consumes an InputStream through a Scanner which looks like String input = scanner.nextLine().toLowerCase(); if (input.isEmpty()) { return defaultAnswer; }...

Either using IOUtils.toInputStream("") or new ByteArrayInputStream(new byte[0]) may work. The latter would certainly provide an empty stream, but it may make your code fail because there isn't an empty line to read - there's no line... more 7/18/2014 4:57:51 AM

tcpClient and IRC client issues

Can someone tell me why the following code isn't working? using System; using System.IO; using System.Net.Sockets; using System.Text; using System.Threading; using...

You're not including a line break after the PING or USER messages. From RFC 2812: IRC messages are always lines of characters terminated with a CR-LF (Carriage Return - Line Feed) pair So you should have: this.writer.Write("PASS... more 7/17/2014 5:47:50 AM

how to inherit Part of Constructor from super class to sub class in java

How to inherit some parameters of superclass constructor to subclass constructor? For example I want only weight and height to be inherited to subclass, how to construct the...

Either you need to supply a mood to the constructor in the superclass (possibly as a constant), or you need to add a constructor to the superclass which doesn't take a mood. You need to ask yourself whether every Question/People really... more 7/17/2014 4:46:38 AM

Timer skipping on Nexus device running 4.2

I have recording functionality in my application. I'm using a handler with refresh rate of 1000ms to update the handler for timer. Its working fine with no skipping of seconds in...

If you've got a timer updating every 1000ms, then if it happens to take a bit more than 1000ms between calls and you're unlucky enough to be close to a second boundary, then you would see it "skip" a second sometimes. For example, suppose... more 7/17/2014 4:35:23 AM

Implementing an interface with a return type that implements the required return type

Why can't I do this? IHasOperatingSystem { IOperatingSystem OperatingSystem { get; } } Computer<T> : IHasOperatingSystem where T : IOperatingSystem { public T...

It's telling me that the type should be IOperatingSystem, but if T implements IOperatingSystem, shouldn't that be sufficient? No. That's just not the way C# works. In order to implement an interface, or override a method, the... more 7/16/2014 7:48:32 PM

IEqualityComparer and Linq Distinct Hard Code GetHashCode()

I have an array of CustomObject s and a custom IEqualityComparer<CustomObject>. I have hard coded the IEqualityComparer.GetHashCode() method to return a constant 42. ...

When I run linq's Distinct method on the array, nothing is filtered out. Anyone know why? Yes - Equals is going to return false for any two distinct objects. Within your Equals implementation, you're calling the... more 7/16/2014 1:47:02 PM

How to Remove multiple items in List using RemoveAll on condition?

I tried like following. MyList.RemoveAll(t => t.Name == "ABS"); MyList.RemoveAll(t => t.Name == "XYZ"); MyList.RemoveAll(t => t.Name == "APO"); Instead how can I do...

You only need one lambda expression - the || goes within that: MyList.RemoveAll(t => t.Name == "ABS" || t.Name == "XYZ" || t.Name == "APO"); In other words, "Given a t, I want to remove the element if t.Name is ABS, or if t.Name is... more 7/16/2014 12:23:07 PM

Syntax to move backwards in LinkedList?

i know that LinkedLists are implemented in a doubly linked way, so each node has a next and a previous pointer. however, i couldn't find what syntax to use to access the previous...

LinkedList has a listIterator(int) method. So you can use: // Start at the end... ListIterator<Foo> iterator = list.listIterator(list.size()); while (iterator.hasPrevious()) { Foo foo = iterator.previous(); } That doesn't... more 7/16/2014 7:17:33 AM

Automagically convert properties to auto getter/setter

I've generated a code base for service communication from a WSDL file which resulted in around 100 classes containing the following: public class SomeClass { private string...

If you just need to do this once, you can let R# do it for you with a Code Cleanup action. Right-click on the project (or solution, or single source file), select "Cleanup code..." and then use profile which includes "Use auto-property,... more 7/15/2014 4:26:29 PM