All Questions
8 questions
0
votes
1
answer
312
views
How to generate lazy stream from a fixed number of expressions in Java?
I would like to get the same as Stream.of, but lazy. I.e. I want to do the same as
Stream<MyClass> s = Stream.of(
expression1(),
expression2(),
expression3(),
...
)
I can do
List<...
- 51.4k
4
votes
1
answer
3k
views
Why does the `orElseThrow()` method in Java take a `Supplier` as a parameter instead of an `Exception`?
Why does the orElseThrow() method in Java take a Supplier as a parameter instead of an Exception? This is the question and the best answer I have found is in here, stating
The overarching concept ...
- 256
2
votes
1
answer
167
views
Method reference not evaluated lazily? [duplicate]
I was under the impression that the following lambda expression
() -> object.method()
was equivalent to the method reference
object::method
This is compounded by IntelliJ which keeps nagging me ...
- 825
13
votes
1
answer
508
views
Filter Function Not Lazy
I'm making my very own version of Java's Stream library for fun. Here's my class signature:
class Stream<T> {
Supplier<T> head;
Supplier<Stream<T>> tail;
...
}
Also, I ...
28
votes
6
answers
12k
views
Lazy evaluation for logging in Java 8
When you have values than are expensive to compute, a common pattern you see in logging frameworks is
if (log.isDebugEnabled()) {
String value = expensiveComputation();
log.debug("value: {}", ...
- 7,616
5
votes
2
answers
955
views
simulate Lazy in Java8
I wrote the following code to simulate Lazy<T> in Java:
import java.util.function.Supplier;
public class Main {
@FunctionalInterface
interface Lazy<T> extends Supplier<T> {...
- 51
8
votes
0
answers
3k
views
Java Lambdas and Streams: pass streams around [closed]
I have a fairly dumb question. We all know that stream can have a number of intermediate operations but the real computation is done only when we call some terminal operation. Is it common to pass ...
- 3,542
5
votes
2
answers
2k
views
Java Lambda Iteration List from JPA [duplicate]
I found some strange behaviour when using lambda with JPA, seems java 8 lambda don't iterate when get a list from another object.
For Example:
List<MyObject> list = anotherObject....
- 51