The Map.of and Map.ofEntries are the static factory methods of and has been introduced in Java 9. UserStream.peek(u -> u.setName(u.getName().toLowerCase()))Īlternatively, we could have used map(), but peek() is more convenient since we don't want to replace the element. The Map.of and Map.ofEntries are static factory methods that return unmodifiable Map containing specified mapping. For example, let's say we want to convert all user's name to lowercase before printing them: Stream userStream = Stream.of(new User("Alice"), new User("Bob"), new User("Chuck")) On top of that, peek() can be useful in another scenario: when we want to alter the inner state of an element. A NavigableMap may be accessed and traversed in either ascending or descending key order. It demonstrates, how we observe the elements that passed each operation. Let's have a closer look at a few of these. JavaFX is an open source, next generation client application platform for desktop, mobile and embedded systems built on Java. Since these are all sets, similar iteration principles apply to all of them. Simply put, we can extract the contents of a Map using entrySet (), keySet (), or values (). Let's consider this snippet from the same Javadoc page: Stream.of("one", "two", "three", "four") Overview In this quick tutorial, we'll look at the different ways of iterating through the entries of a Map in Java. Peek()‘s Javadoc page says: “ This method exists mainly to support debugging, where you want to see the elements as they flow past a certain point in a pipeline“. 1) Team: India Name: Player1 2) Team: Australia Name: Player2 3) Team: Ireland Name: Player3 4) Team: South Africa Name: Player4 5) Team: Sri Lanka Name: Player5 7) Team: England Name: Player7. Stream nameStream = Stream.of("Alice", "Bob", "Chuck") Expected result : Remove the list Player6 and Player8 team and final below ListOfData.
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