How Can I Pair Successive Elements from a Stream in Java?

Pairing Successive Elements from a Stream

In the realm of programming, it often becomes necessary to transform a stream of elements into pairs of successive values. To achieve this transformation, the initial stream must be manipulated in a specific manner.

Traditional methods involve using a loop to iterate through the elements and manually creating pairs. However, in Java 8 and later, streams provide a more elegant and efficient approach.

Solution

The Java 8 Streams API possesses limited support for stateful pipeline stages. This presents challenges when attempting to retrieve adjacent stream elements or obtain their indexes.

A solution to these limitations involves driving the stream by indexes. By using a data structure like ArrayList, which grants random access to its elements, one can generate the pairs:

IntStream.range(1, arrayList.size())
             .mapToObj(i -> new Pair(arrayList.get(i-1), arrayList.get(i)))
             .forEach(System.out::println);

While this method offers parallelism, it has the limitation of being unsuitable for infinite input streams.

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