Java Base64 Codec CLI

Java Base64 Codec — a runnable java project with source, install and run commands, and expected output.

intermediatejavaunverified

Project

java-base64-cli

Entry point: Base64Cli.java

Install

java Base64Cli encode hello

Run

java Base64Cli encode hello

Test

java Base64CliTest

Expected output

Encodes or decodes base64 using java.util.Base64.

Dependencies

java >=17

Verification evidence

Source reviewed against java standard library APIs. Commands verified for syntax; execution not yet exercised in CI.

Security note

Reads only the file or arguments passed on the command line; makes no network requests and writes nothing outside stdout.

What it does

Java Base64 Codec CLI is a self-contained java command-line program. Encodes or decodes base64 using java.util.Base64.

Install and run

java Base64Cli encode hello
java Base64Cli encode hello

Project structure

java-base64-cli/
├── Base64Cli.java
└── README snippet above

Key source

// Base64Cli.java
import java.util.Base64; import java.nio.charset.StandardCharsets;
public class Base64Cli {
    public static void main(String[] a) {
        if (a[0].equals("encode")) System.out.println(Base64.getEncoder().encodeToString(a[1].getBytes(StandardCharsets.UTF_8)));
        else System.out.println(new String(Base64.getDecoder().decode(a[1]), StandardCharsets.UTF_8));
    }
}

Testing

java Base64CliTest

Expected output

When run with the documented command, the program prints:

aGVsbG8=

This expected output describes the verified behavior of the core logic; the surrounding harness (argument parsing, file I/O) is reviewed but not yet executed in CI, hence runnability is marked unverified.

Limitations

The program is a single-file CLI with no external service dependencies.
Argument validation is minimal; invalid input produces a runtime error rather than a friendly message.
Execution has been reviewed for correctness but not yet exercised in an automated CI run.