----
package authoring.tutorial;

public class App {
    public String getGreeting() {
        return "Hello World!";
    }

    public static void main(String[] args) {
        System.out.println(new App().getGreeting());
    }
}
----

The code prints out a simple "Hello World" greeting to the screen.

A test class is available at `app/src/test/java/authoring/tutorial/AppTest.java`:

	it to be interpreted differently than if it were the main module.
-- exclude-err --
go: example.com/cmd/a@v1.0.0-exclude (in example.com/cmd@v1.0.0-exclude):
	The go.mod file for the module providing named packages contains one or
	more exclude directives. It must not contain directives that would cause

     * {@code <groupId>:<artifactId>:<version>} but some of these coordinates may still be unknown at the point the
     * exception is thrown so this information is merely meant to assist the user.
     *
     * @return The identifier of the POM or an empty string if not known, never {@code null}.
     */
    public String getModelId() {

func TestPipe1(t *testing.T) {
	c := make(chan int)
	r, w := Pipe()
	var buf = make([]byte, 64)
	go checkWrite(t, w, []byte("hello, world"), c)
	n, err := r.Read(buf)
	if err != nil {
		t.Errorf("read: %v", err)
	} else if n != 12 || string(buf[0:12]) != "hello, world" {
		t.Errorf("bad read: got %q", buf[0:n])
	}
	<-c
	r.Close()
	w.Close()
}

func reader(t *testing.T, r Reader, c chan int) {

</p>

<p>
For example, in this program:
</p>

<pre>
var a string

func f() {
	print(a)
}

func hello() {
	a = "hello, world"
	go f()
}
</pre>

<p>
calling <code>hello</code> will print <code>"hello, world"</code>
at some point in the future (perhaps after <code>hello</code> has returned).
</p>

<h3 id="goexit">Goroutine destruction</h3>

<p>

	runtime.UnlockOSThread()
	println("OK")
}

func LockOSThreadTemplateThreadRace() {
	// This test attempts to reproduce the race described in
	// golang.org/issue/38931. To do so, we must have a stop-the-world
	// (achieved via ReadMemStats) racing with two LockOSThread calls.
	//
	// While this test attempts to line up the timing, it is only expected
	// to fail (and thus hang) around 2% of the time if the race is
	// present.

        when:
        succeeds('installDist')

        then:
        file('build/install/sample').exists()

        when:
        runViaStartScript()

        then:
        outputContains('Hello World!')
    }

    @Requires(UnitTestPreconditions.UnixDerivative)
    def "can execute generated Unix start script using JAVA_HOME with spaces"() {
        given:

        model.value == 42

        and:
        def streamedModels = listener1.models
        streamedModels.size() == 2
        (streamedModels[0] as GradleProject).name == "hello-world"
        (streamedModels[1] as EclipseProject).gradleProject.name == "hello-world"

        when:
        withIsolatedProjects()
        def model2 = runBuildAction(new ModelStreamingBuildAction()) {
            setStreamedValueListener(listener2)
        }

		t.Fatalf("Test_Run_Positive_DoNothing: actual state of world should be empty but it's not")
	}
	if len(dsw.GetPluginsToRegister()) != 0 {
		t.Fatalf("Test_Run_Positive_DoNothing: desired state of world should be empty but it's not")
	}
}

// Populates desiredStateOfWorld cache with one plugin.
// Calls Run()
// Verifies the actual state of world contains that plugin
func Test_Run_Positive_Register(t *testing.T) {

	stopped := worldIsStopped.Load()
	if stopped > 1 {
		systemstack(func() {
			print("inconsistent world stop count=", stopped, "\n")
			throw("inconsistent world stop count")
		})
	}

	return stopped == 1
}

// assertWorldStopped throws if the world is not stopped. It does not check
// which M stopped the world.
//
// nosplit to ensure it can be called in as many contexts as possible.
//
//go:nosplit