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JLine is a Java library for handling console input.

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Java

JLine - Java Console Library

JLine is a Java library for handling console input. It’s similar to GNU Readline but with a focus on portability, flexibility, and integration with Java applications. See https://jline.org for its documentation.

Features

Cross-platform support: Works on Windows, macOS, Linux, and other Unix-like systems
Line editing: Emacs and Vi editing modes with customizable key bindings
History management: Persistent command history with search capabilities
Tab completion: Customizable completion for commands, arguments, and file paths
Syntax highlighting: Colorize input based on custom rules
Password masking: Secure input for sensitive information
ANSI terminal support: Full support for ANSI escape sequences and colors
Unicode support: Proper handling of wide characters and combining marks
ConsoleUI components: Interactive UI elements like menus, checkboxes, and prompts

Installation

Maven

<dependency>
    <groupId>org.jline</groupId>
    <artifactId>jline</artifactId>
    <version>3.30.0</version>
</dependency>

Gradle

implementation 'org.jline:jline:3.30.0'

Quick Start

Here’s a simple example to get you started:

import org.jline.reader.*;
import org.jline.reader.impl.*;
import org.jline.terminal.*;
import org.jline.terminal.impl.*;

public class HelloJLine {
    public static void main(String[] args) {
        try {
            // Create a terminal
            Terminal terminal = TerminalBuilder.builder()
                    .system(true)
                    .build();

            // Create line reader
            LineReader reader = LineReaderBuilder.builder()
                    .terminal(terminal)
                    .build();

            // Prompt and read input
            String line = reader.readLine("JLine > ");

            // Print the result
            System.out.println("You entered: " + line);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

Modules

JLine is organized into several modules:

jline-terminal: Core terminal functionality
jline-reader: Line editing and reading
jline-console: Higher-level console abstractions
jline-console-ui: Interactive UI components (checkboxes, lists, etc.)
jline-style: Styling and coloring support
jline-builtins: Built-in commands and utilities
jline-remote-ssh: SSH server support
jline-remote-telnet: Telnet server support