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Proper usage of Optional.ifPresent()
... am trying to understand the ifPresent() method of the Optional API in Java 8.
5 Answers
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Why do we use __init__ in Python classes?
...ing to make sense..is it like how you have to predeclare your variables in java "String left" or something? then once its initialized to the class, you can manipulate the values? Its just a bit confusing when compared to functions because I can just send values to functions and don't need to initial...
How to instantiate non static inner class within a static method?
...de-notes, but I don't find them responsive to the actual question.
import java.awt.Graphics;
import java.awt.Color;
import javax.swing.JPanel;
import javax.swing.JFrame;
public class Example {
public class InnerClass extends JPanel {
public void paint(Graphics g) {
g.setCol...
Regex for quoted string with escaping quotes
...\\.)*"/
Works in The Regex Coach and PCRE Workbench.
Example of test in JavaScript:
var s = ' function(){ return " Is big \\"problem\\", \\no? "; }';
var m = s.match(/"(?:[^"\\]|\\.)*"/);
if (m != null)
alert(m);
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What is the source code of the “this” module doing?
...f the module, this, is also part of the joke because other languages (e.g. Java) use this similar to how Python uses self. Typing import this looks just as pointless as typing import java.self;.
– Luc
Jun 16 '16 at 21:57
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How to extract epoch from LocalDate and LocalDateTime?
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Convert from human readable date to epoch:
long epoch = new java.text.SimpleDateFormat("MM/dd/yyyyHH:mm:ss").parse("01/01/1970 01:00:00").getTime() / 1000;
Convert from epoch to human readable date:
String date = new java.text.SimpleDateFormat("MM/dd/yyyyHH:mm:ss").format(new java....
Get first and last day of month using threeten, LocalDate
...rt a solution that matches closely to business requirements
import static java.time.temporal.TemporalAdjusters.*;
LocalDate initial = LocalDate.of(2014, 2, 13);
LocalDate start = initial.with(firstDayOfMonth());
LocalDate end = initial.with(lastDayOfMonth());
However, Jon's solutions are also fi...
Declaring variables inside a switch statement [duplicate]
...it:
By the way, this quirk isn't as uncommon as you might think. In C and Java, it's also illegal to use a local variable declaration as the lone statement (meaning "not surrounded by braces) in a for, while, or do loop, or even in if and else clauses. (In fact, this is covered in puzzler #55 of "J...
how to File.listFiles in alphabetical order?
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In Java 8:
Arrays.sort(files, (a, b) -> a.getName().compareTo(b.getName()));
Reverse order:
Arrays.sort(files, (a, b) -> -a.getName().compareTo(b.getName()));
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Setting up a JavaScript variable from Spring model by using Thymeleaf
...g Thymeleaf as template engine. How I pass a variable from Spring model to JavaScript variable?
9 Answers
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