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Title: Predicate.not() for negation | java.evolved

Open Graph Title: Predicate.not() for negation | java.evolved

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Description: Use Predicate.not() to negate method references cleanly instead of writing lambda wrappers.

Open Graph Description: Use Predicate.not() to negate method references cleanly instead of writing lambda wrappers.

X Description: Use Predicate.not() to negate method references cleanly instead of writing lambda wrappers.

Opengraph URL: https://javaevolved.github.io/streams/predicate-not.html

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Predicate.not() ↗https://docs.oracle.com/en/java/javase/25/docs/api/java.base/java/util/function/Predicate.html#not(java.util.function.Predicate)
View proof source ↗https://github.com/javaevolved/javaevolved.github.io/blob/main/proof/streams/PredicateNot.java
Streams Beginner Stream.toList() Java 8 List result = stream .filter(s -> s.length() > 3) .collect(Collectors.toList()); Java 16+ List result = stream .filter(s -> s.length() > 3) .toList(); Hover to see modern ➜ JDK 16+ → https://javaevolved.github.io/streams/stream-tolist.html
Strings Beginner String.isBlank() Java 8 boolean blank = str.trim().isEmpty(); // or: str.trim().length() == 0 Java 11+ boolean blank = str.isBlank(); // handles Unicode whitespace too Hover to see modern ➜ JDK 11+ → https://javaevolved.github.io/strings/string-isblank.html
Streams Beginner Stream takeWhile / dropWhile Java 8 List result = new ArrayList<>(); for (int n : sorted) { if (n >= 100) break; result.add(n); } // no stream equivalent in Java 8 Java 9+ var result = sorted.stream() .takeWhile(n -> n < 100) .toList(); // or: .dropWhile(n -> n < 10) Hover to see modern ➜ JDK 9+ → https://javaevolved.github.io/streams/stream-takewhile-dropwhile.html
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