Browse questions answered by Jon Skeet

Writing to file

I am writing to a file for the first time, but the text on the file comes out completely wrong. Instead of numbers (which it is supposed to print), it prints unrecognizable...

You're calling Writer.write(int): Writes a single character. The character to be written is contained in the 16 low-order bits of the given integer value; the 16 high-order bits are ignored. My guess is that's not what you want to... more 4/9/2014 7:03:48 PM

Java SHA1 hash to base64 : unsigned bytes?

I am trying to hash a value (SHA1) in both C# and Java, and then return a base64 representation. I get 2 different results. I know this is because Java uses signed bytes while C#...

The problem is very simple... From your C# code: SHA256Managed sha256hasher = new SHA256Managed() SHA-256 != SHA-1. Use the SHA1 class instead in C#, or use SHA-256 in Java as well. As you apparently can't change the C# code, you should... more 4/9/2014 3:51:25 PM

Emulate goto in Java

I have code (simplified hypothetical example): public String handleEditRequest(...) { if (isBadArg()) { ... req.getSession().setAttribute("errorMessage",...

Just wrap the whole method in another one: public String handleEditRequest(...) { Timer timer = new Timer().start(); try { return handleEditRequestImpl(...); } finally { timer.stop(); ... more 4/9/2014 2:17:43 PM

In what situation a class is not affected to a accessibility level?

Pretty straight forward here. I want to know when a class in c# (and probably any oo-language) is okay being neither "public", "private", "protected"... I am asking this question...

The general rule in C# is "the default is as private as you can explicitly declare it". So: namespace Foo { class Bar // Implicitly internal class Bar { int x; // Implicitly private int x void Baz() {} //... more 4/9/2014 2:06:47 PM

Does this account for daylight savings?

// someTime is epoch in millis (UTC) final long timeNow = new Date().getTime(); final long midnight = timeNow - timeNow % (3600 * 24 * 1000L); final long yesterdayMidnight =...

Your current code doesn't do anything with the local time zone - everything is in UTC, effectively (certainly in terms of your code, which is dealing in "milliseconds since the Unix epoch"). If you want to make your code... more 4/9/2014 1:59:01 PM

Confused on a LINQ where clause

public ViewResult List(string category, int page = 1) { ProductsListViewModel viewModel = new ProductsListViewModel { Products = repository.Products ...

It's basically allowing the category filter to be optional - if the category parameter is non-null, then it has to match whatever you're looking at. Otherwise, just include all categories. more 4/9/2014 12:55:59 PM

Why does it not work? (send function as parameter by Runnable in java )

I have a project in java, and I have a problem. Description of goal: In Form A (MainForm) I have some buttons in enable(false) mode. I have a function LockOrUnlockButtons()...

This isn't a constructor: public Void AddCstmrForm(Runnable myFunc) throws Exception { initComponents(); ... } It's a method called AddCstmrForm with a Void return type. I think you meant: public AddCstmrForm(Runnable myFunc)... more 4/9/2014 12:43:18 PM

Totalhours method displays minutes in wrong format

I have the below code which displays the totalhours, but the totalhours displays it differently for values less than 60 mins. That is for 35 mins or 45 mins (greater than 30mins)...

As you're using .NET 4, you can make your life much simpler by using TimeSpan.ToString(string) to do the formatting for you: using System; class Test { static void Main() { int minutes = 31; TimeSpan ts =... more 4/9/2014 12:37:24 PM

Static parameters in C# methods

I have doubt in C# about Static class usage in methods. Suppose that we have a method with two parameter int and Enum in another class. public void DemoMethod(int...

You can never instantiate a TenantType - so the only value you could possibly pass into DemoMethod would be null. Think about how you'd be calling the method - if you were expecting to call (say) DemoMethod(10, TenantType.TenantUser) then... more 4/9/2014 10:41:36 AM

Formatting DateTime value in C#

I have a datetime variable like this: DateTime date1 = DateTime.Now; // has 9.4.2014 01:12:35 I want to assign this to another datetime or change its value like...

The code you've written just assigns a value to a variable. It doesn't return anything, and it doesn't have any inherent string representation. A DateTime value is just a date/time. It can be displayed in whatever format you want, but... more 4/9/2014 10:24:31 AM