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Java ArrayList how to add elements at the beginning
...tructure which offers methods like addFirst(e) and offerFirst(e)
Deque<String> deque = new LinkedList<>();
deque.add("two");
deque.add("one");
deque.addFirst("three");
//prints "three", "two", "one"
Analysis
Space and time complexity of insertion is with LinkedList constant (O(1)). S...
How do you find the sum of all the numbers in an array in Java?
...3
Finally, it can take an array of type T. So you can per example have a String which contains numbers as an input and if you want to sum them just do :
int sum = Arrays.stream("1 2 3 4".split("\\s+")).mapToInt(Integer::parseInt).sum();
...
Using Server.MapPath in external C# Classes in ASP.NET
...
class test
{
public static void useServerPath(string path)
{
if (File.Exists(path)
{
\\...... do whatever you wabt
}
else
{
\\.....
}
}
Now when you call the method from the codebehind
for example :
protected void BtAtualizacao_Click(object sender, EventArgs e)
...
JSLint is suddenly reporting: Use the function form of “use strict”
...nd by default JSHint does not recognise or allow the use of module and the string version of use strict. We can set a JSHint rule that will accept our Node programs. Let’s edit our jshint task configuration and add an options key:
jshint: {
options: {
node: true
},
}
Adding node: true to...
What's the role of adapters in Android?
...}
void manyMoreMethods(){}
}
Lets define an adapter:
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1, android.R.id.text1, values);
First parameter: Context
Second parameter: Layout for the row
Third parameter: ID of the TextVi...
JFrame in full screen Java
...LocalGraphicsEnvironment().getScreenDevices()[0];
public static void main(String[] args) {
final JFrame frame = new JFrame("Display Mode");
frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
frame.setUndecorated(true);
JButton btn1 = new JButton("Full-Screen");
btn...
What does “Object reference not set to an instance of an object” mean? [duplicate]
...
The following code is a simple way of reproducing this:
static void Main(string[] args)
{
var exampleClass = new ExampleClass();
var returnedClass = exampleClass.ExampleMethod();
returnedClass.AnotherExampleMethod(); //NullReferenceException here.
}
class ExampleClass
{
public Ret...
Remove/hide a preference from the screen
...wo);
}
}
public void onSharedPreferenceChanged(SharedPreferences prefs, String key) {
if (key.equals("mySwitchPref")) {
this.recreate();
}
}
The only downside that I can see with this, is there is a flash as the screen is recreated from scratch.
...
How to write into a file in PHP?
...get file
$cd = stripslashes($_POST['code']);
// Show the msg, if the code string is empty
if (empty($cd))
echo "Nothing to write";
// if the code string is not empty then open the target file and put form data in it
else
{
$file = fopen("demo.php", "w");
echo fwrite($file, $cd);
/...
Save bitmap to location
...ssion rate of 85% :
// Assume block needs to be inside a Try/Catch block.
String path = Environment.getExternalStorageDirectory().toString();
OutputStream fOut = null;
Integer counter = 0;
File file = new File(path, "FitnessGirl"+counter+".jpg"); // the File to save , append increasing numeric coun...