Constants.setProperties(Constants.JULIA_PATH, "/usr/local/bin/julia");
Constants.setProperties(Constants.JULIA_PORT, "8001");

// Creating a scripting interface for Julia
manager = new ScriptEngineManager();
engine = manager.getEngineByName("Julia");

// Sending command 'a = 3' to Julia from Java
engine.eval("a = 3");

// Handling the result in Java
Object a = engine.get("a");

Constants.setProperties(Constants.JULIA_PATH, "/usr/local/bin/julia");
Constants.setProperties(Constants.JULIA_PORT, "8001");

// Creating a scripting interface for Julia
manager = new ScriptEngineManager();
engine = manager.getEngineByName("Julia");

// Creating array in Julia
engine.eval("a = [1,2,3]");

// Handling result in Java
Object result = engine.get("a");

assertTrue(result instanceof JSONArray);

JSONArray arr = (JSONArray) result;
assertEquals(1, arr.getInt(0));
assertEquals(2, arr.getInt(1));
assertEquals(3, arr.getInt(2));

Constants.setProperties(Constants.JULIA_PATH, "/usr/local/bin/julia");
Constants.setProperties(Constants.JULIA_PORT, "8001");

// Creating a scripting interface for Julia
manager = new ScriptEngineManager();
engine = manager.getEngineByName("Julia");

// Creating array in Julia
engine.eval("a = [1,2,3]");
engine.eval("f(x) = sum(x) / length(x)")
engine.eval("b = f(a)")

// Handling result in Java
Object result = engine.get("b");

Constants.setProperties(Constants.JULIA_PATH, "/usr/local/bin/julia");
Constants.setProperties(Constants.JULIA_PORT, "8001");

// Creating a scripting interface for Julia
manager = new ScriptEngineManager();
engine = manager.getEngineByName("Julia");

Invocable invocable = (Invocable)engine;
engine.eval("using Statistics");
engine.eval("a = [1.0, 2.0, 3.0]");

// The result is average of 1.0, 2.0, and 3.0
// result = 2.0
Object result = invocable.invokeFunction("mean", "a");

caller = new JuliaCaller("/usr/local/bin/julia", 8000);
caller.startServer();
caller.Connect();

caller.Execute("mypi = 3.14159265");
JSONObject obj = caller.GetAsJSONObject("mypi");
// Assertation is true
assertEquals(obj.getDouble("mypi"), 3.14159265);

// Creating object 'myarray' in Julia
caller.Execute("myarray = [1,2,3,4,5]");

// Getting the array back in Java
JSONArray obj = caller.GetAsJSONArray("myarray");

// Assertations are true
assertEquals(obj.length(), 5);
assertEquals(obj.getInt(0), 1);
assertEquals(obj.getInt(1), 2);
assertEquals(obj.getInt(2), 3);
assertEquals(obj.getInt(3), 4);
assertEquals(obj.getInt(4), 5);

caller.ShutdownServer();

List<Double> values = List.of(1.0, 2.0, 10.0, -4.0);
caller.addJuliaObject(JuliaObject.createArrayVariable("a", values));
caller.Execute("using Statistics");
caller.Execute("ave = mean(a)");
double result = caller.getDouble("ave");
assertEquals(2.25, result);