What is a for each loop? - Cracking the Java Coding Interview

Cracking the #Java #Coding #Interview - Question 137: What is a for each loop?

[bluehelion]

I didn't know JVM drop it at the end.
Very good and simple explanation! Merci bcp

[StrangerNoises]

the forEach(Consumer) method *can* be faster. The default impl in Iterable does indeed just use for-each, but a specific iterable impl can (if its author isn't lazy and it's a win) take advantage of its access to the internal data structure to do better... (the point about the jvm possibly optimising out the implicit iterator may make it harder for a specific impl to do better though). i tend to use forEach() in preference on the offchance.

[redcrafterlppa]

It can sometimes even be the only way to iterate through something. For example a map has no way of being iterated by index.

[MyCodingDiary]

I've never commented on a video before, but I had to for this one. It's that good!

[petitmoi]

En parlant de l'itérateur pourquoi java n'utilise pas plus la class Enumeration<T> ? En effet il serait pratique d'avoir un typage pour un itérateur qui ne permettrait que la lecture d'une collection, au lieu d'utiliser un itérateur qui offre la l'opération .remove()

[akrk]

In the comming future is goto statement be added in Java?

[Speiger]

The only thing I wish the JVM would accept is this:
for(String entry : () -> list.iterator()) {}
Sadly it doesn't.

Point is, sometimes you just have a iterator, so using a lambda to trick into a Iterable would be really cool.

[MyCodingDiary]

Thumbs up if you agree that this video is amazing!

[rebok]

I have an idea for the next java tip
Java Coding Tip #138:
How to migrate to kotlin