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【stream_file_folder】import java.nio.charset.Charset;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.Arrays;
public class Main {
public static void main(String[] args) throws Exception{
long uniqueWords = Files.lines(Paths.get("Main.java"), Charset.defaultCharset())
.flatMap(line -> Arrays.stream(line.split(" ")))
.distinct()
.count();
System.out.println("There are " + uniqueWords + " unique words in data.txt");
}
}
