February 2014
Beginner
1248 pages
62h 25m
English
Content preview from Java™ How To Program (Early Objects), Tenth Edition
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Summarizing the Occurrences of Each Word in the File
Lines 19–24 summarize contents of the text file "Chapter2Paragraph.txt" (which is located in the folder with the example) into a Map<String, Long> in which each String key is a word in the file and the corresponding Long value is the number of occurrences of that word. The statement performs the following tasks:
• Line 20 uses Files method lines to create a Stream<String> for reading the lines of text from a file. Class Files (package java.nio.file) is one of many classes throughout the Java APIs that have been enhanced to support Streams.
• Line 21 uses Stream method map to remove all the punctuation, except apostrophes, in the lines of text. The lambda argument represents a Function that ...
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