Write and read typed binary fields.

Java: Data streams use a matching write/read order and fixed encodings for Java primitive values.

Java Main.java
import java.util.*;
import java.util.stream.*;
import java.util.regex.*;
import java.nio.file.*;
import java.nio.charset.StandardCharsets;
import java.time.*;
import java.time.format.DateTimeFormatter;
import java.time.temporal.*;
import java.math.*;
import java.io.*;
import java.net.*;
import java.security.MessageDigest;
import java.util.concurrent.*;

public class Main {
    public static void main(String[] args) throws Exception {
        var bytes = new ByteArrayOutputStream();
        try (var output = new DataOutputStream(bytes)) {
            output.writeInt(42);
            output.writeBoolean(true);
        }
        try (var input = new DataInputStream(new ByteArrayInputStream(bytes.toByteArray()))) {
            System.out.println(input.readInt());
            System.out.println(input.readBoolean());
        }
    }
}

Expected output EXAMPLE

42
true

Details

Save as Main.java, compile with javac Main.java, and run java Main. Uses the Java 21 standard library. Data streams use a matching write/read order and fixed encodings for Java primitive values.

✓ Verified

Tested on Ubuntu 24.04.5 LTS · · openjdk 21.0.12.1 2026-08-18 · openjdk-21-jdk-headless 21.0.12.1+1-1~24.04.4

Test inputs, results and environment

The exact published code ran in a dedicated Linux test container with prepared inputs. Unprivileged snippet process, external networking disabled, read-only root filesystem, and a fresh temporary working directory. Fixtures and output records are isolated from the application database. Testing covers this example and its stated checks, not every input, operating system, or runtime version. The Linux container shares its host's kernel; this is not a native Windows test.

Architecture / host kernel
x86_64 / 6.18.54.1-microsoft-standard-WSL2
Snippet identity / locale
uid=65534, gid=65534 (unprivileged) / C.UTF-8
Interpreter invocation
javac Main.java && java Main
Container image ID
sha256:32dc2d998158b6554c99b73b533f423696a0f3e31e8cbea9db10b5eee9a2fadd
Code SHA-256
bde3690ca8df9c7ad9d75631b16169c4be6703698e41889dffe4fd5aa061a2de
Dependencies
openjdk-21-jdk-headless 21.0.12.1+1-1~24.04.4

Test input setup

These are the prepared inputs used by the test harness. See Details above for the prerequisites and how to run this example.

# No input files required.

Observed standard output

42
true

Exit code: 0. Standard error: empty. Validation: Exact stdout comparison. System-dependent values above are one recorded run.