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instanceof Vs getClass( )
...learned an alternative yesterday
We all know you can do:
if(o instanceof String) { // etc
but what if you dont know exactly what type of class it needs to be?
you cannot generically do:
if(o instanceof <Class variable>.getClass()) {
as it gives a compile error.
Instead, here is an ...
How do you test to see if a double is equal to NaN?
... the following code.
public class Not_a_Number {
public static void main(String[] args) {
// TODO Auto-generated method stub
String message = "0.0/0.0 is NaN.\nsimilarly Math.sqrt(-1) is NaN.";
String dottedLine = "------------------------------------------------";
D...
Loop through all the files with a specific extension
... shell options. By default, a non-matching pattern is treated as a literal string. You can set nullglob to have it treated as an empty sequence, or set failglob to have it treated as an error. (If you set both, failglob takes precedence.)
– chepner
Jul 7 '17 at...
Must qualify the allocation with an enclosing instance of type GeoLocation
...E GeoLocation.java
public class GeoLocation {
public static void main(String[] args) throws InterruptedException {
int size = 10;
// create thread pool with given size
ExecutorService service = Executors.newFixedThreadPool(size);
// queue some tasks
f...
How can I pipe stderr, and not stdout?
... preserved as stderr, but you won't see any lines in stderr containing the string "something".
This has the unique advantage of not reversing or discarding stdout and stderr, nor smushing them together, nor using any temporary files.
...
Place cursor at the end of text in EditText
...
There is a function called append for ediitext which appends the string value to current edittext value and places the cursor at the end of the value.
You can have the string value as the current ediitext value itself and call append();
myedittext.append("current_this_edittext_string");
...
Pandas: Setting no. of max rows
...y sets the options inside of a block of code. Pass in the option name as a string followed by the value you want it to be. You may pass in any number of options in the same line:
with pd.option_context('display.max_rows', 100, 'display.max_columns', 10):
some pandas stuff
You can also reset a...
Java8: Why is it forbidden to define a default method for a method from java.lang.Object
..., I tried to write an interface that defines a default version of the toString method. Java tells me that this is forbidden, since methods declared in java.lang.Object may not be default ed. Why is this the case?
...
How exactly to use Notification.Builder
...ecodeResource(res, R.drawable.some_big_img))
.setTicker(res.getString(R.string.your_ticker))
.setWhen(System.currentTimeMillis())
.setAutoCancel(true)
.setContentTitle(res.getString(R.string.your_notif_title))
.setContentText(res.getString(...
Open new Terminal Tab from command line (Mac OS X)
... if the path is coming from a variable, you'll need to use a double-quoted string instead of single-quoted, and escape the inner quoted string, and probably the path itself.
– Gordon Davisson
Dec 23 '18 at 6:02
...