---
# (DD10) Business Logic — Example.main() [6 LOC]

| Field | Value |
|-------|-------|
| Fully Qualified Name | `io.github.biezhi.java11.http.Example` |
| Layer | Utility |
| Module | `http` (Package: `io.github.biezhi.java11.http`) |

## 1. Role

### Example.main()

This method is the executable entry point for the Java 11 HTTP client demonstration class. Its business role is not to implement a reusable service workflow, but to select which HTTP sample scenario should run when the class is launched from the command line or an IDE. In the current source, it actively invokes only the asynchronous POST sample, while the synchronous GET, asynchronous GET, and HTTP/2 examples are present but disabled as comments. The method therefore acts as a lightweight dispatch point for demo execution, allowing a developer to switch between HTTP behavior samples without changing the surrounding class structure. From a system perspective, it is the top-level launcher for the `http` package example set and serves as the simplest integration boundary for the HTTP client showcase.

## 2. Processing Pattern (Detailed Business Logic)

```mermaid
flowchart TD
    START["main(args)"]
    COMMENTED_SYNC["Commented call syncGet(\"https://biezhi.me\")"]
    COMMENTED_ASYNC["Commented call asyncGet(\"https://biezhi.me\")"]
    CALL_ASYNC_POST["Call asyncPost()"]
    COMMENTED_HTTP2["Commented call http2()"]
    END_NODE["Return / Next"]
    START --> COMMENTED_SYNC
    COMMENTED_SYNC --> COMMENTED_ASYNC
    COMMENTED_ASYNC --> CALL_ASYNC_POST
    CALL_ASYNC_POST --> COMMENTED_HTTP2
    COMMENTED_HTTP2 --> END_NODE
```

**CRITICAL — Constant Resolution:**
This method does not branch on runtime constants. The only concrete URI literals in the block are `https://biezhi.me`, which are demo endpoints embedded directly in comments, and `asyncPost()` is the only executed call.

## 3. Parameter Analysis

| No | Parameter Name | Type | Business Description |
|----|---------------|------|---------------------|
| 1 | `args` | `String[]` | Command-line arguments supplied at launch time for the demo entry point. In the current implementation they are accepted for standard Java entry-point compatibility, but no argument value is inspected or used to influence the selected HTTP sample. |

External state read by the method:
- None. The method does not reference instance fields or external application state.

## 4. CRUD Operations / Called Services

### Pre-computed evidence from code analysis graph:

| CRUD | SC / CBS | SC Code | Entity / DB | Operation Description |
|------|----------|---------|-------------|----------------------|
| - | `Example.asyncPost` | Example | - | Calls `asyncPost` in `Example` |

Analyze all method calls within this method and classify each as a CRUD operation.

| CRUD | SC / CBS | SC Code | Entity / DB | Operation Description |
|------|----------|---------|-------------|----------------------|
| C | `asyncPost` | Example | - | Launches the asynchronous HTTP POST demo, which builds the request payload and sends the outbound request workflow. |

## 5. Dependency Trace

Trace who calls this method and what this method ultimately calls.

| # | Caller (Screen/Batch) | Call Chain (Full Path to this Method) | Terminal (SC / CRUD / Entity) |
|---|----------------------|--------------------------------------|-------------------------------|
| 1 | Entry Point | `java launcher / IDE run configuration` -> `Example.main` | `asyncPost [C] -` |

## 6. Per-Branch Detail Blocks

**Block 1** — [SEQUENCE] (L188-L193)

> Entry-point selection for the HTTP demo runner. Only one method is executed; the other examples are intentionally disabled.

| # | Type | Code |
|---|------|------|
| 1 | EXEC | `// syncGet("https://biezhi.me");` // commented-out sample call |
| 2 | EXEC | `// asyncGet("https://biezhi.me");` // commented-out sample call |
| 3 | CALL | `asyncPost();` // executes the asynchronous POST sample |
| 4 | EXEC | `// http2();` // commented-out sample call |
| 5 | RETURN | `}` // end of method |

## 7. Glossary

| Term | Type | Business Meaning |
|------|------|------------------|
| `args` | Field | Command-line argument array supplied to the Java entry point. |
| HTTP | Business term | Hypertext Transfer Protocol — standard protocol used by the demo to send web requests. |
| POST | Business term | HTTP method used to submit data to a remote endpoint. |
| GET | Business term | HTTP method used to retrieve data from a remote endpoint. |
| HTTP/2 | Business term | Newer HTTP protocol version supported by the demo class as an optional sample. |
| demo | Business term | Example-only code path intended for learning or validation rather than production processing. |
| entry point | Technical term | The method invoked first when the class is launched. |
| asyncPost | Method | Demonstration routine that performs an asynchronous HTTP POST request. |
| biezhi.me | External endpoint | Sample website used as a commented demo target for GET-based examples. |