What is the String.lines() method in Java?
Java 11 adds a new method called lines to the String class that returns a Stream of lines extracted from a string.
The string is separated for every:
-
Line feed character -
\n -
Carriage return character -
\r -
Carriage return character followed immediately by a line feed character -
\r\n
Example
import java.util.stream.Stream;public class Main{public static void main(String[] args){String str = "Line 1 \n Line 2 \r Line 3 \r\n Line 4";Stream<String> lines = str.lines();lines.forEach(line -> {System.out.println(line);});}}
In the above code, we have a string with multiple lines. We separate each line with the String.lines() method, which returns a Stream of lines. We then loop through the stream and print the line.
Points to note:
- An empty string contains
0lines. - A line can be:
- zero or more characters followed by a line terminator (e.g.,
"test\n", "\n"). - one or more characters followed by end of string (e.g.,
"test", "a").
- zero or more characters followed by a line terminator (e.g.,
- The stream returned from the
linesmethod is in the same string order as the string where we called the lines method. - The line doesn’t include the line terminator.
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