Is there a way to automate user input with JLine's LineReader?

6 days ago 8

ARTICLE AD BOX

When handling user input through Scanner(System.in), you can use System.setIn() to automate user input.

Like this:

package edu.ntnu.idi.idat; import java.io.ByteArrayInputStream; import java.io.InputStream; import java.util.Scanner; public final class TestCode { private TestCode() { } /** * Test code. * @param args */ public static void main( final String[] args ) { InputStream input = System.in; String testInputString = "test" + System.lineSeparator() + "test2"; ByteArrayInputStream testInput = new ByteArrayInputStream(testInputString.getBytes()); System.setIn(testInput); Scanner inputScanner = new Scanner(System.in); System.out.println(inputScanner.nextLine()); System.out.println(inputScanner.nextLine()); inputScanner.close() } }

But when trying the same method for JLine's LineReader, it doesn't work:

package edu.ntnu.idi.idat; import java.io.ByteArrayInputStream; import java.io.IOException; import java.io.InputStream; import org.jline.reader.LineReader; import org.jline.reader.LineReaderBuilder; import org.jline.terminal.Terminal; import org.jline.terminal.TerminalBuilder; public final class TestCode { private TestCode() { } /** * Test code. * @param args * @throws IOException */ public static void main( final String[] args ) throws IOException { InputStream input = System.in; String testInputString = "test" + System.lineSeparator() + "test2"; ByteArrayInputStream testInput = new ByteArrayInputStream(testInputString.getBytes()); System.setIn(testInput); Terminal terminal = TerminalBuilder.builder().build(); LineReader lineReader = LineReaderBuilder .builder() .terminal(terminal) .build(); System.out.println(lineReader.readLine()); System.out.println(lineReader.readLine()); terminal.close() } }

I believe this is because inputScanner uses System.in (as can be seen when constructing it), while LineReader doesn't seem to.

My question is: is there a way to automate user input for LineReader as well?