Constructors and Object Lifecycle

A constructor has the class name and no return type. It initializes a new object after superclass construction and field initialization. this(...) delegates within the class; super(...) delegates to the direct superclass, and either must be first.

Construction and cleanup

final class Report implements AutoCloseable {
    private final BufferedWriter writer;

    Report(Path path) throws IOException {
        writer = Files.newBufferedWriter(path, StandardCharsets.UTF_8);
    }

    void write(String line) throws IOException { writer.write(line); }
    @Override public void close() throws IOException { writer.close(); }
}

try (Report report = new Report(path)) {
    report.write("ready");
}

Java has no deterministic destructor. Garbage collection reclaims unreachable memory but does not promise timely release of files, sockets, locks, or native handles. Use AutoCloseable and try-with-resources. Finalization is deprecated/removed from modern practice; Cleaner is only a defensive fallback. Do not let this escape during construction, and prefer immutable successfully constructed objects.