By Nikolche Mihajlovski in Java 8 streams — Apr 5, 2014

Filter Java 8 stream

Let's filter a list of strings using Java 8 streams:

List<String> list = Arrays.asList("a", "", "b", "", "c");
 
// Count the non-empty strings
long nonEmptyCount = list.stream()
        .filter(x -> !x.isEmpty())
        .count(); // 3
 
// Count the empty strings
long emptyCount = list.stream()
        .filter(String::isEmpty) // same as .filter(x -> x.isEmpty())
        .count(); // 2

Example of filtering Java 8 streams using the stream.filter() method.

The first part of the code example filters the non-empty strings and counts them. The second part of filters and counts the empty strings.

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