java-stream Archives

Java, Programming

IT Nursery

Is it possible to cast a Stream in Java 8?

Is it possible to cast a stream in Java 8? Say I have a list of objects, I can do something like this ...

June 2, 2022
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Java, Programming

IT Nursery

Why is a combiner needed for reduce method that converts type in java 8

I’m having trouble fully understanding the role that the combiner fulfills in Streams reduce method. For example, the following code doesn’t compile: int ...

June 1, 2022
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Java, Programming

IT Nursery

How to add elements of a Java8 stream into an existing List

Javadoc of Collector shows how to collect elements of a stream into a new List. Is there an one-liner that adds the results ...

June 1, 2022
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Java, Programming

IT Nursery

What Java 8 Stream.collect equivalents are available in the standard Kotlin library?

In Java 8, there is Stream.collect which allows aggregations on collections. In Kotlin, this does not exist in the same way, other than ...

May 30, 2022
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Java, Programming

IT Nursery

Java 8 stream reverse order

General question: What’s the proper way to reverse a stream? Assuming that we don’t know what type of elements that stream consists of, ...

May 30, 2022
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Java, Programming

IT Nursery

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

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

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

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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