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# Business Logic — Example.demonstrateStringStripLeading() [6 LOC]

| Field | Value |
|-------|-------|
| Fully Qualified Name | `io.github.biezhi.java11.string.Example` |
| Layer | Utility (Demonstration / Sample code) |
| Module | `string` (Package: `io.github.biezhi.java11.string`) |

## 1. Role

### Example.demonstrateStringStripLeading()

This method is a **JDK 11 API demonstration routine** that showcases the `String.stripLeading()` method introduced in Java 11. It serves as a self-contained example within a documentation-style codebase authored by "biezhi" (package `io.github.biezhi`). The method:

- **Business operation**: Constructs a sample string with leading and trailing whitespace, calls `stripLeading()` to remove only the leading whitespace, and prints both the original and stripped values to `System.out`.
- **Service type**: None — this is a standalone demonstration, not a business service.
- **Design pattern**: Simple procedural demonstration (also known as a "cookbook" or "snippets" pattern). Each method in the `Example` class demonstrates one JDK feature with minimal scaffolding.
- **Role in the larger system**: Part of a collection of JDK version-specific API demos. These methods are referenced via a main application entry point (e.g., `Java11DemoApplication`) to validate or illustrate the behavioral changes introduced in each JDK release.
- **Conditional branches**: None. This method has a linear execution path with no conditionals.

## 2. Processing Pattern (Detailed Business Logic)

```mermaid
flowchart TD
    START(["demonstrateStringStripLeading()"])
    STEP1["Declare originalString = \"  biezhi.me  23333  \""]
    STEP2["Call writeHeader to print the header with originalString value"]
    STEP3["Call System.out.println to print originalString.stripLeading result"]
    END_NODE(["Return / Next"])

    START --> STEP1
    STEP1 --> STEP2
    STEP2 --> STEP3
    STEP3 --> END_NODE
```

**Processing summary:**

| Step | Type | Description |
|------|------|-------------|
| 1 | Local setup | Declares a local `String` variable `originalString` with the literal value `"  biezhi.me  23333  "` (contains 2 leading spaces, 2 trailing spaces, and embedded spaces). |
| 2 | Method call | Invokes `writeHeader("String.stripLeading() on '  biezhi.me  23333  '")` to print a section header to `System.out`. This formats a header line followed by a separator (`===`) for console readability. |
| 3 | Method call | Calls `System.out.println()` with the result of `originalString.stripLeading()`, which removes leading whitespace and outputs `'biezhi.me  23333  '` (trailing whitespace preserved). |
| 4 | Return | Returns `void` (no value). |

**Constant Resolution:** No constants are used in this method. The string literals are hardcoded values.

## 3. Parameter Analysis

| No | Parameter Name | Type | Business Description |
|----|---------------|------|---------------------|
| - | (none) | - | - |

**Internal state used:**

| Source | Description |
|--------|-------------|
| `originalString` (local) | A `String` literal `"  biezhi.me  23333  "` containing leading and trailing whitespace, used to demonstrate `stripLeading()` behavior. |
| `writeHeader()` (peer method in same class) | A helper method in `Example` that prints a header with separator lines (`===`) to `System.out`. |

## 4. CRUD Operations / Called Services

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

| CRUD | SC / CBS | SC Code | Entity / DB | Operation Description |
|------|----------|---------|-------------|----------------------|
| - | `Example.writeHeader` | - | - | Calls `writeHeader` in `Example` (console header printer, not a CRUD operation) |

**Analysis:** This method performs **no CRUD operations**. It is a pure demonstration method that:
1. Declares a local string variable
2. Calls `writeHeader` for console output formatting (I/O only)
3. Calls `System.out.println` for stdout output (I/O only)

No database, entity, or service component interactions occur.

## 5. Dependency Trace

| # | Caller (Screen/Batch) | Call Chain (Full Path to this Method) | Terminal (SC / CRUD / Entity) |
|---|----------------------|--------------------------------------|-------------------------------|
| 1 | Demo entry point | `Java11DemoApplication.main()` -> `Example.demonstrateStringStripLeading()` | None (no CRUD endpoints) |

**Caller details:**
- The only reference to `demonstrateStringStripLeading()` in the codebase is a **commented-out** call at line 108 (`//        demonstrateStringStripLeading();`), suggesting it may have been called during development or testing.
- The method is a `public static void` entry point intended to be invoked directly from a demo application's `main` method.
- No production screens, batches, or CBS components depend on this method.

## 6. Per-Branch Detail Blocks

This method has a linear execution path with no conditional branches, loops, or switch statements. There is a single flat block.

**Block 1** — [METHOD BODY] (L59-L64)

> The entire method body executes sequentially. It demonstrates `String.stripLeading()` by creating a test string, printing a header, and printing the stripped result.

| # | Type | Code |
|---|------|------|
| 1 | SET | `String originalString = "  biezhi.me  23333  "` // Local variable initialized with hardcoded literal containing leading/trailing whitespace |
| 2 | EXEC | `writeHeader("String.stripLeading() on '" + originalString + "'")` // Calls peer method to print a section header with the original string value |
| 3 | EXEC | `System.out.println("'" + originalString.stripLeading() + "'")` // Invokes JDK 11 `stripLeading()` method and prints the result with trailing whitespace preserved |
| 4 | RETURN | `void` // No return value, execution completes |

**Result of `stripLeading()`:**

| Input | Output | Change |
|-------|--------|--------|
| `"  biezhi.me  23333  "` | `"biezhi.me  23333  "` | 2 leading spaces removed, trailing spaces and embedded spaces preserved |

## 7. Glossary

| Term | Type | Business Meaning |
|------|------|------------------|
| `stripLeading()` | JDK 11 API | `String.stripLeading()` — Removes leading whitespace (characters with code point <= 32) from the beginning of a string. Equivalent to `trim()` but does NOT remove trailing whitespace. |
| `stripTrailing()` | JDK 11 API | `String.stripTrailing()` — Companion method that removes only trailing whitespace. |
| `writeHeader` | Demo utility | Helper method in the `Example` class that prints a formatted section header (title + `===` separator) to `System.out` for console demo readability. |
| `biezhi.me` | Hardcoded literal | The domain name of the author of this demo codebase (Kohei Kuwata / Biezhi). Used as sample content in multiple JDK 11 `String` method demonstrations. |
| 23333 | Hardcoded literal | A numeric suffix appended to the sample string for visual distinction. Has no semantic meaning. |
| JDK | Acronym | Java Development Kit — Oracle's Java platform implementation. JDK 11 (released September 2018) is an LTS (Long-Term Support) release. |
| Demo | Purpose | Short for "demonstration" — sample code used to illustrate API behavior, not intended for production use. |

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