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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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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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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...
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...
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....
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...
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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App Inventor 2 蓝牙发送十六进制字节方案：文本转Hex字节详解 - App应用开...
...给 WriteBytes 发的是4个字节？从 BLE 扩展源码（BluetoothLEint.java）分析，WriteBytes 内部的 toIntList() 方法会将字符串的每个字符转为 Unicode 码：
字符串 "ABCD" → 取每个字符的 Unicode 码 → 'A'=65, 'B'=66, 'C'=67, 'D'=6...
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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