JSONObject version of https://github.com/benjiman/lambda-type-references/blob/master/src/test/java/com/benjiweber/HashLiteralExample.java

JSONObjectExample.java

import static java.util.Arrays.asList;
import static org.junit.Assert.assertEquals;

import org.json.JSONArray;
import org.json.JSONObject;
import org.junit.Test;

public class JSONObjectExample {
	@Test
	public void java_json_literal() throws Throwable{
		JSONObject json = object(
				hello -> "world",
				bob -> bob,
				bill -> object(
						was -> was,
						here -> here),
				john -> array("is", "a", "man"));

		assertEquals("world", json.get("hello"));
		assertEquals("bob", json.get("bob"));
		JSONObject bill = json.getJSONObject("bill");
		assertEquals("was", bill.get("was"));
		assertEquals("here", bill.get("here"));
		JSONArray a = json.getJSONArray("john");
		assertEquals("is", a.get(0));
		assertEquals("a", a.get(1));
		assertEquals("man", a.get(2));
		assertEquals(
				"{\"bob\":\"bob\",\"bill\":{\"here\":\"here\",\"was\":\"was\"},"
				+ "\"john\":[\"is\",\"a\",\"man\"],\"hello\":\"world\"}"
				, json.toString());
	}

	public static <T> JSONArray array(T... values){
		return new JSONArray(values);
	}

	public static JSONObject object(NamedValue<?>... keyValuePairs) {
		return asList(keyValuePairs)
			.stream()
			.reduce(
				new JSONObject(),
				(jo, kvp) -> jo.put(kvp.name(), kvp.value()),
				(jo1, jo2) -> {
					jo2.keySet().forEach(n -> jo1.put(n, jo2.get(n)));
					return jo1;
				});
	}
}