Java Streams - Java Stream From String

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Streams from Char Sequence

chars() from the CharSequence interface returns an IntStream whose elements are int values representing the characters.

We can use chars() method on a String, a StringBuilder, and a StringBuffer.

The following code creates a stream of characters from a string, filters out all digits and whitespaces, and prints the remaining characters:

/*from  w  w  w  .  jav a 2s.  c  o  m*/
public class Main {
  public static void main(String[] args) {
    String str = "5 123,123,qwe,1,123, 25";
    str.chars()
    .filter(n ->  !Character.isDigit((char)n) &&   !Character.isWhitespace((char)n))
    .forEach(n ->  System.out.print((char)n));

  }
}

The code above generates the following result.

Streams from Regex

splitAsStream(CharSequence input) method from the java.util.regex.Pattern class returns a stream of String whose elements match the pattern.

The following code obtains a stream of strings by splitting a string using a regular expression (",").

The matched strings are printed on the standard output.

import java.util.regex.Pattern;
//ww w.  ja  v a2  s.  c o m
public class Main {
  public static void main(String[] args) {
    String str = "XML,CSS,HTML"; 
    Pattern.compile(",")
    .splitAsStream(str)
    .forEach(System.out::println);

  }
}

The code above generates the following result.

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