Getting Started with Java

curl -Ls https://sh.jbang.dev | bash -s - app setup

$ jbang -c 'println("Hello World")'
Hello World

$ jbang -c 'println("Hello "  + args[0])' Universe
Hello Universe

$ jbang -i
|  Welcome to JShell -- Version 11.0.15
|  For an introduction type: /help intro

jshell> println("Hello!")
Hello

$ jbang --java 17 -i
WARNING: Using incubator modules: jdk.incubator.vector, jdk.incubator.foreign
|  Welcome to JShell -- Version 17
|  For an introduction type: /help intro

jshell>

$ jbang init hello.java
[jbang] File initialized. You can now run it with
'jbang hello.java' or edit it using
'jbang edit --open=[editor] hello.java' where [editor]
is your editor or IDE, e.g. 'eclipse'
$ jbang hello.java
[jbang] Building jar...
Hello World
$ ./hello.Java
Hello World

$ jbang init -t cli app.java
[jbang] File initialized. You can now run it with
'jbang app.java' or edit it using
'jbang edit --open=[editor] app.java' where [editor]
is your editor or IDE, e.g. 'eclipse'

 ///usr/bin/env jbang "$0" "$@" ; exit $?
 //DEPS info.picocli:picocli:4.5.0

import picocli.CommandLine;
import picocli.CommandLine.Command;
import picocli.CommandLine.Parameters;

import java.util.concurrent.Callable;

@Command(name = "app", mixinStandardHelpOptions = true, version = "app 0.1",
        description = "app made with jbang")
class app implements Callable<Integer> {

    @Parameters(index = "0", description = "The greeting to print", defaultValue = "World!")
    private String greeting;

    public static void main(String... args) {
        int exitCode = new CommandLine(new app()).execute(args);
        System.exit(exitCode);
    }

    @Override
    public Integer call() throws Exception { // your business logic goes here...
        System.out.println("Hello " + greeting);
        return 0;
    }
}

$ ./app.java
[jbang] Resolving dependencies...
[jbang] info.picocli:picocli:jar:4.5.0
Done
[jbang] Dependencies resolved
[jbang] Building jar...
Hello World

$ ./app.java --help
Usage: app [-hV] <greeting>
app made with jbang
      <greeting>   The greeting to print
  -h, --help       Show this help message and exit.
  -V, --version    Print version information and exit.

jbang edit app.java
[jbang] You requested to open default editor but no default
editor configured.

jbang can download and configure a visual studio code (VSCodium)
with Java support to use

Do you want to

(1) Download and run VSCodium
(2) Use 'code'
(3) Use 'eclipse'
(4) Use 'idea'
(0) Cancel

$ jbang --debug app.java
Listening for transport dt_socket at address: 4004

$ cat 5letterwords.txt | jbang -c \
  'lines().filter(s->s.contains("dog")).forEach(p->println(p))'

$ jbang init -t qrest myservice.java
$ ./myservice.java
./myservice.java
[jbang] Resolving dependencies...
[jbang] Artifacts used for dependency management:
         io.quarkus:quarkus-bom:pom:1.11.0.Final
[jbang] io.quarkus:quarkus-resteasy
Done
[jbang] Dependencies resolved
[jbang] Building jar...
[jbang] Post build with io.quarkus.launcher.JBangIntegration
May 04, 2022 9:30:43 PM org.jboss.threads.Version <clinit>
INFO: JBoss Threads version 3.2.0.Final
May 04, 2022 9:30:44 PM io.quarkus.deployment.QuarkusAugmentor run
INFO: Quarkus augmentation completed in 999ms
__  ____  __  _____   ___  __ ____  ______
 --/ __ \/ / / / _ | / _ \/ //_/ / / / __/
 -/ /_/ / /_/ / __ |/ , _/ ,< / /_/ /\ \
--\___\_\____/_/ |_/_/|_/_/|_|\____/___/
2022-05-04 21:30:45,453 INFO  [io.quarkus] (main) Quarkus 2.8.0.Final on JVM started in 0.839s. Listening on: http://0.0.0.0:8080
2022-05-04 21:30:45,488 INFO  [io.quarkus] (main) Profile prod activated.
2022-05-04 21:30:45,488 INFO  [io.quarkus] (main) Installed features: [cdi, resteasy]

///usr/bin/env jbang "$0" "$@" ; exit $?
//DEPS io.quarkus:quarkus-bom:${quarkus.version:1.11.0.Final}@pom
//DEPS io.quarkus:quarkus-resteasy
//JAVAC_OPTIONS -parameters
//FILES resources/index.html=index.html
//SOURCES **.java

import io.quarkus.runtime.Quarkus;
import javax.enterprise.context.ApplicationScoped;
import javax.ws.rs.GET;
import javax.ws.rs.Path;

@Path("/hello")
@ApplicationScoped
public class myservice {
    @GET
    public String sayHello() {
        return "Hello from Quarkus with jbang.dev";
    }
}

$ jbang -c "Hello"
$ jbang app.java
$ jbang demo.jsh
$ jbang app.jar
$ jbang org.jreleaser:jreleaser:1.0.0
$ jbang https://github.com/jbangdev/jbang/../examples/inetTest.java
$ jbang https://jbang.dev

//DEPS com.github.javafaker:javafaker:1.0.2

import com.github.javafaker.Faker;

Faker faker = new Faker();

$ jbang -s faker@jbangdev -c \
  'Stream.generate(faker.name()::fullName).filter(s->s.contains("Angie")).forEach(s -> println("Awesome " + s))'

$ jbang app install -n myapp https://.../a.jar
$ jbang app install quarkus@quarkusio
$ quarkus
quarkus

Quarkus CLI version 2.8.2.Final

Create Quarkus projects with Maven, Gradle, or JBang.
Manage extensions and source registries.

Create: quarkus create
Iterate: quarkus dev
Build and test: quarkus build

Find more information at https://quarkus.io
If you have questions, check https://github.com/quarkusio/quarkus/discussions


Usage: quarkus [-ehv] [--verbose] [-D=<String=String>]... [COMMAND]
Options: