Online Java Editor

Record + stream

public record User(String id, String email) {}

List<User> active = users.stream()
    .filter(User::enabled)
    .toList();

HTTP client (java.net)

var req = HttpRequest.newBuilder(URI.create(url))
    .header("Accept", "application/json")
    .GET()
    .build();
var res = HttpClient.newHttpClient().send(req, HttpResponse.BodyHandlers.ofString());

Types & variables

final String name = "Ada";
int count = 0;
List<String> tags = List.of("a", "b");

Loops

for (var item : items) {
  process(item);
}

while (cursor.hasNext()) {
  cursor.next();
}

Methods

public static int add(int a, int b) {
  return a + b;
}

Comments

// line comment
/* block */
/** javadoc */

Parse → transform → emit

// Java pipeline sketch
const input = readLines();
const output = input
  .map(line => line.trim())
  .filter(Boolean)
  .map(transform);
writeLines(output);

Error handling wrapper

// Java
function runSafely(task) {
  try {
    return { ok: true, value: task() };
  } catch (err) {
    return { ok: false, error: String(err) };
  }
}

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