Java - Lambdas
From My Limbic Wiki
Lambdas
Syntax
<source lang="java">
(String first, String second) -> Integer.compare(first.length(), second.length())
</source>
Functional Interfaces
Declaration
Runnable has a functional interface wich has exactly one abstract method <source lang="java">
Runnable runner = () -> { ...; System.out.println(this.toString()); ... };
(String first, String second) -> {
if (first.length() < second.length()) return -1; else if (first.length() > second.length()) return 1; else return 0;
} </source>
Use
<source lang="java"> Arrays.sort(strings, String::compareToIgnoreCase) </source>
Use
Use Functional Interfaces https://docs.oracle.com/javase/8/docs/api/java/lang/FunctionalInterface.html They have only one method
Questions & Answers
concrete methods interface methode default implementee = interface fonctionnelle
- if a class implements two interfaces with the same name method: multiplicatedefaulterror
je ne peux utiliser que les variables finales dans une lambda expression lambda n'est pas thread safe
Loops
INTERNAL: nouveau foreach ==> je ne veux pas savoir ce ton implementation: fais le avec la lambda que je te donne EXTERNAL: ancien foreach, a BANNIR