java-8 Archives - Page 2 of 11

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Java 8 Stream and operation on arrays

I have just discovered the new Java 8 stream capabilities. Coming from Python, I was wondering if there was now a neat way ...

May 30, 2022
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Java, Programming

IT Nursery

Does a lambda expression create an object on the heap every time it’s executed?

When I iterate over a collection using the new syntactic sugar of Java 8, such as myStream.forEach(item -> { // do something useful ...

May 30, 2022
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Java, Programming

IT Nursery

Limit a stream by a predicate

Is there a Java 8 stream operation that limits a (potentially infinite) Stream until the first element fails to match a predicate? In ...

May 30, 2022
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Java, Programming

IT Nursery

Adding up BigDecimals using Streams

I have a collection of BigDecimals (in this example, a LinkedList) that I would like to add together. Is it possible to use ...

May 29, 2022
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Java, Programming

IT Nursery

Unable to obtain LocalDateTime from TemporalAccessor when parsing LocalDateTime (Java 8)

I am simply trying to convert a date string into a DateTime object in Java 8. Upon running the following lines: DateTimeFormatter formatter ...

May 29, 2022
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Java, Programming

IT Nursery

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 ...

May 29, 2022
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Java, Programming

IT Nursery

What is the reason why “synchronized” is not allowed in Java 8 interface methods?

In Java 8, I can easily write: interface Interface1 { default void method1() { synchronized (this) { // Something } } static void ...

May 28, 2022
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Java, Programming

IT Nursery

Java 8 stream’s .min() and .max(): why does this compile?

Note: this question originates from a dead link which was a previous SO question, but here goes… See this code (note: I do ...

May 28, 2022
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Java, Programming

IT Nursery

Java 8: How do I work with exception throwing methods in streams?

Suppose I have a class and a method class A { void foo() throws Exception() { ... } } Now I would like ...

May 28, 2022
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Java, Programming

IT Nursery

What is the difference between Optional.flatMap and Optional.map?

What’s the difference between these two methods: Optional.flatMap() and Optional.map()? An example would be appreciated. 8 Answers 8

May 27, 2022
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