public class UnsafeLoader {
public static Unsafe loadUnsafe() {
return Unsafe.getUnsafe();
}
}
While this example will compile, it is likely to fail at runtime unless the Unsafe class was loaded with the primary classloader. To ensure that happens the JVM should be loaded with...
Sometimes, programmers who are new Java will use primitive types and wrappers interchangeably. This can lead to problems. Consider this example:
public class MyRecord {
public int a, b;
public Integer c, d;
}
...
MyRecord record = new MyRecord();
record.a = 1; // OK
...
If the formatting (white space, new lines, indentation) of the code matters, use the pre element in combination with the code element:
<pre>
<code>
x = 42
if x == 42:
print "x is … … 42"
</code>
</pre>
You still have to esc...
Optional Parameters
In TypeScript, every parameter is assumed to be required by the function. You can add a ? at the end of a parameter name to set it as optional.
For example, the lastName parameter of this function is optional:
function buildName(firstName: string, lastName?: string) {
// ...
Boolean(...) will convert any data type into either true or false.
Boolean("true") === true
Boolean("false") === true
Boolean(-1) === true
Boolean(1) === true
Boolean(0) === false
Boolean("") === false
Boolean("1") === true
Boolean("0") === t...
You can customize your theme’s color palette.
Using framework APIs
5.0
<style name="AppTheme" parent="Theme.Material">
<item name="android:colorPrimary">@color/primary</item>
<item name="android:colorPrimaryDark">@color/pri...
This tutorial explains how to download Image using AsyncTask in Android. The example below download image while showing progress bar while during download.
Understanding Android AsyncTask
Async task enables you to implement MultiThreading without get Hands dirty into threads. AsyncTask enables pro...
MediaPlayer class can be used to control playback of audio/video files and streams.
Creation of MediaPlayer object can be of three types:
Media from local resource
MediaPlayer mediaPlayer = MediaPlayer.create(context, R.raw.resource);
mediaPlayer.start(); // no need to call prepare(); create...
Inline style
You can manipulate the inline CSS style of an HTML element by simply reading or editing its style property.
Assume the following element:
<div id="element_id" style="color:blue;width:200px;">abc</div>
With this JavaScript applied:
var element = doc...
Since all lifecycle hooks in Vue.js are just functions, you can place any of them directly in the instance declaraction.
//JS
new Vue({
el: '#example',
data: {
...
},
methods: {
...
},
//LIFECYCLE HOOK HANDLING
created: function() {
...
Immutable types are types that when changed create a new version of the object in memory, rather than changing the existing object in memory. The simplest example of this is the built-in string type.
Taking the following code, that appends " world" onto the word "Hello"
string ...
The goal is to generate the following XML document:
<FruitBasket xmlns="http://www.fruitauthority.fake">
<Fruit ID="F0001">
<FruitName>Banana</FruitName>
<FruitColor>Yellow</FruitColor>
</Fruit>
<Fruit ID="F000...
Set the MONGO_URL environment variable before starting your local Meteor app.
Linux/MacOS Example:
MONGO_URL="mongodb://some-mongo-host.com:1234/mydatabase" meteor
or
export MONGO_URL="mongodb://some-mongo-host.com:1234/mydatabase"
meteor
Windows Example
Note: don't u...
package {
import flash.display.Sprite;
import flash.events.Event;
public class Viewport extends Sprite {
/** Constructor */
public function Viewport() {
super();
// Listen for added to stage event
addEventListener(Event.ADDED_TO_STAGE, addedToStageHandle...
To modify an existing column in Rails with a migration, run the following command:
rails g migration change_column_in_table
This will create a new migration file in db/migration directory (if it doesn’t exist already), which will contain the file prefixed with timestamp and migration file name w...
While in insert mode, press <C-o> to temporarily leave insert mode and execute a one-off normal command.
Example
<C-o>2w jumps to the second word to the left and returns to insert mode.
Note: Repeating with . will only repeat the actions from returning to insert mode
This allows for ...
Html5-Canvas ...
Is an Html5 element.
Is supported in most modern browsers (Internet Explorer 9+).
Is a visible element that is transparent by default
Has a default width of 300px and a default height of 150px.
Requires JavaScript because all content must be programmatically added to the Canv...
When Flash makes a request for data from an external source, that operation is asynchronous. The most basic explanation of what this means is that the data loads "in the background" and triggers the event handler you allocate to Event.COMPLETE when it is received. This can happen at any po...
