The Java Tutorials have been written for JDK 8. Examples and practices described in this page don't take advantage of improvements introduced in later releases and might use technology no longer available.
See Java Language Changes for a summary of updated language features in Java SE 9 and subsequent releases.
See JDK Release Notes for information about new features, enhancements, and removed or deprecated options for all JDK releases.
You can use a BreakIterator to determine sentence boundaries. You start by creating a BreakIterator with the getSentenceInstance method:
BreakIterator sentenceIterator =
BreakIterator.getSentenceInstance(currentLocale);
To show the sentence boundaries, the program uses the markBoundaries method, which is discussed in the section Word Boundaries. The markBoundaries method prints carets (^) beneath a string to indicate boundary positions. Here are some examples:
She stopped. She said, "Hello there," and then went on. ^ ^ ^ He's vanished! What will we do? It's up to us. ^ ^ ^ ^ Please add 1.5 liters to the tank. ^ ^