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Why does my application spend 24% of its life doing a null check?
...e of code. The code for the binary tree iterator is below with the results from running performance analysis against it.
3 ...
Handling InterruptedException in Java
...e (i.e. don't catch it at all).
Example: Your method waits for a value from the network to finish the computation and return a result. If the blocking network call throws an InterruptedException your method can not finish computation in a normal way. You let the InterruptedException propagate.
...
Immutable class?
...und this problem is to return a copy of an array or collection when called from a getter:
public List<T> getList() {
// return a copy of the list so the internal state cannot be altered
return new ArrayList(list);
}
What is the advantage of immutability?
The advantage of immutability c...
How can I explode and trim whitespace?
For example, I would like to create an array from the elements in this string:
11 Answers
...
How to print to stderr in Python?
...
I found this to be the only one short + flexible + portable + readable:
from __future__ import print_function
import sys
def eprint(*args, **kwargs):
print(*args, file=sys.stderr, **kwargs)
The function eprint can be used in the same way as the standard print function:
>>> print(...
How can I listen to the form submit event in javascript?
...documentation on MDN.
To cancel the native submit event (prevent the form from being submitted), use .preventDefault() in your callback function,
document.querySelector("#myForm").addEventListener("submit", function(e){
if(!isValid){
e.preventDefault(); //stop form from submitting
...
What is the difference between atomic and critical in OpenMP?
... if this will not change. (Visual Studio 2012 has an OpenMP implementation from March 2002.) To quote MSDN:
The expression statement must have one of the following forms:
xbinop=expr
x++
++x
x--
--x
In the preceding expressions: x is an lvalue expression with scal...
What is JSON and why would I use it?
...ementation for this.
Example on how to use the JSON parser (with the json from the above code snippet):
//The callback function that will be executed once data is received from the server
var callback = function (result) {
var johnny = JSON.parse(result);
//Now, the variable 'johnny' is an...
How to compare two Dates without the time portion?
...Joda Time was a fine recommendation at the time, use the java.time library from Java 8+ instead where possible.
My preference is to use Joda Time which makes this incredibly easy:
DateTime first = ...;
DateTime second = ...;
LocalDate firstDate = first.toLocalDate();
LocalDate secondDate = seco...
conversion from string to json object android
...
To get a JSONObject or JSONArray from a String I've created this class:
public static class JSON {
public Object obj = null;
public boolean isJsonArray = false;
JSON(Object obj, boolean isJsonArray){
this.obj = obj;
th...