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What is a NullPointerException, and how do I fix it?
...sign it to the variable before trying to use the contents of the variable (called dereferencing). So you are pointing to something that does not actually exist.
Dereferencing usually happens when using . to access a method or field, or using [ to index an array.
If you attempt to dereference num BEF...
What “things” can be injected into others in Angular.js?
... for telling Angular how to create new injectable things; these things are called services. Services are defined by things called providers, which is what you're creating when you use $provide. Defining a provider is done via the provider method on the $provide service, and you can get hold of the $...
A simple scenario using wait() and notify() in java
...simple scenario i.e. tutorial that suggest how this should be used, specifically with a Queue?
6 Answers
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How to generate a random int in C?
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Note: Don't use rand() for security. If you need a cryptographically secure number, see this answer instead.
#include <time.h>
#include <stdlib.h>
srand(time(NULL)); // Initialization, should only be called once.
int r = rand(); // Returns a pseudo-random integer be...
Can I invoke an instance method on a Ruby module without including it?
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If a method on a module is turned into a module function you can simply call it off of Mods as if it had been declared as
module Mods
def self.foo
puts "Mods.foo(self)"
end
end
The module_function approach below will avoid breaking any classes which include all of Mods.
module Mods
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var self = this?
Using instance methods as callbacks for event handlers changes the scope of this from "My instance" to "Whatever just called the callback" . So my code looks like this
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Singular or plural controller and helper names in Rails
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still has singular CreditCard here: guides.rubyonrails.org/command_line.html#rails-generate
– rcrogers
Mar 5 '14 at 19:27
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adb shell command to make Android package uninstall dialog appear
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You can do it from adb using this command:
adb shell am start -a android.intent.action.DELETE -d package:<your app package>
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How to set time zone of a java.util.Date?
... @BrDaHa is correct.You'll need to TimeZone.setDefault() before calling getTime() so that the new date object will be in the time zone that you want. In JDK 1.8, Calendar.getTime() calls return new Date(getTimeInMillis());.
– jpllosa
May 9 '17 at 9:2...
-didSelectRowAtIndexPath: not being called
...wAtIndexPath: , but when I select a row at runtime, the method isn't being called. The table view is being populated though, so I know that other tableView methods in my controller are being called.
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