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Does Java SE 8 have Pairs or Tuples?
I am playing around with lazy functional operations in Java SE 8, and I want to map an index i to a pair / tuple (i, value[i]) , then filter based on the second value[i] element, and finally output just the indices.
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The difference between the Runnable and Callable interfaces in Java
... Runnable and Callable interfaces when designing a concurrent thread in Java, why would you choose one over the other?
1...
How to determine if a number is a prime with regex?
I found the following code example for Java on RosettaCode :
4 Answers
4
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Delete all files in directory (but not directory) - one liner solution
...(File file: dir.listFiles()) is probably meant as.... for (File file : new java.io.File("C:\\DeleteMeFolder").listFiles()) ...
– Hartmut P.
Oct 28 '16 at 17:39
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Why can't static methods be abstract in Java?
The question is in Java why can't I define an abstract static method? for example
25 Answers
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How and where are Annotations used in Java?
...t it is more convenient to use annotations because they will belong to the Java code itself, and are hence much easier to manipulate than XML.
Usage of annotations:
Documentation, e.g. XDoclet
Compilation
IDE
Testing framework, e.g. JUnit
IoC container e.g. as Spring
Serialization, e.g. XML
Asp...
Storing a Map using JPA
...tCollection annotation that you can use in conjunction with the support of java.util.Map collections.
Something like this should work:
@Entity
public class Example {
@Id long id;
// ....
@ElementCollection
@MapKeyColumn(name="name")
@Column(name="value")
@CollectionTable(na...
Why must jUnit's fixtureSetup be static?
...der of methods in the .class file is unspecified/compiler-dependent (IIRC, Java's reflection API returns the methods in the same order as they are declared in the .class file, although also that behaviour is unspecified - I have written a library for actually sorting them by their line numbers).
So...
How to open the default webbrowser using java
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java.awt.Desktop is the class you're looking for.
import java.awt.Desktop;
import java.net.URI;
// ...
if (Desktop.isDesktopSupported() && Desktop.getDesktop().isSupported(Desktop.Action.BROWSE)) {
Desktop.getD...
How do I create a Java string from the contents of a file?
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Read all text from a file
Java 11 added the readString() method to read small files as a String, preserving line terminators:
String content = Files.readString(path, StandardCharsets.US_ASCII);
For versions between Java 7 and 11, here's a compact, ro...