---

# (DD17) Business Logic — Example.demonstrateStringStripLeading() [6 LOC]

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

## 1. Role

### Example.demonstrateStringStripLeading()

This method is a focused demonstration routine for the JDK 11 `String.stripLeading()` capability. Its business purpose is to present how a text value behaves when only leading whitespace is removed, while the trailing whitespace remains intact. In practical terms, it acts as a sample output generator for documentation, training, or runtime verification scenarios where developers need to observe the difference between `stripLeading()`, `strip()`, and `stripTrailing()`.

The method follows a simple presentation pattern: it constructs a fixed sample string, writes a formatted header, and prints the transformed result to standard output. There are no conditional branches, loops, or external service dependencies, so the method behaves as a deterministic utility example rather than a business transaction handler. Within the larger class, it belongs to a group of JDK 11 string feature demonstrations and is intended to be invoked directly from a `main` method or from a local test harness.

## 2. Processing Pattern (Detailed Business Logic)

```mermaid
flowchart TD
    START(["demonstrateStringStripLeading()"])
    STEP1(["Initialize originalString with the sample value '  biezhi.me  23333  '"])
    STEP2(["Call writeHeader with the String.stripLeading() title"])
    STEP3(["Print the original string after stripLeading() removes only leading whitespace"])
    END_NODE(["Return / Next"])
    START --> STEP1
    STEP1 --> STEP2
    STEP2 --> STEP3
    STEP3 --> END_NODE
```

**CRITICAL — Constant Resolution:**
This method does not branch on any application constants. The only resolved value in scope is the hard-coded sample string used to demonstrate the JDK feature.

## 3. Parameter Analysis

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

External state read by this method:
- No instance fields are read.
- No external state, request context, database, or system property is consulted.
- The method uses only local literals and the private helper `writeHeader(String)`.

## 4. CRUD Operations / Called Services

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

| CRUD | SC / CBS | SC Code | Entity / DB | Operation Description |
|------|----------|---------|-------------|----------------------|
| - | `Example.writeHeader` | Example | - | Calls `writeHeader` 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 |
|------|----------|---------|-------------|----------------------|
| - | `Example.writeHeader` | Example | - | Formats and prints a demonstration header to standard output |
| - | `String.stripLeading` | JDK String API | - | Removes only leading whitespace from the sample string for display |
| - | `System.out.println` | JDK System API | - | Outputs the demonstration result to the console |

## 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 | `Example.main` | `Example.main` -> `Example.demonstrateStringStripLeading` | `writeHeader [-]` |

## 6. Per-Branch Detail Blocks

**Block 1** — [SEQUENCE] (L59-L64)

> This block demonstrates the full execution path because the method contains no branches.

| # | Type | Code |
|---|------|------|
| 1 | SET | `String originalString = "  biezhi.me  23333  ";` |
| 2 | CALL | `writeHeader("String.stripLeading() on '" + originalString + "'");` |
| 3 | EXEC | `originalString.stripLeading()` // removes only leading whitespace |
| 4 | CALL | `System.out.println("'" + originalString.stripLeading() + "'");` |

## 7. Glossary

| Term | Type | Business Meaning |
|------|------|------------------|
| `stripLeading` | JDK API | String operation that removes leading whitespace only, preserving trailing whitespace |
| `String` | Technical term | Java text type used to hold the sample input and output value |
| `headerText` | Parameter | Text shown in the console header that describes the current demonstration |
| `writeHeader` | Utility method | Local helper that prints a formatted section title to standard output |
| `System.out.println` | Technical API | Console output operation used to display the demonstration result |
| `whitespace` | Business term | Blank characters such as spaces that may appear before or after visible text |
| `JDK 11` | Platform version | Java runtime release that introduced the demonstrated string method |
| `biezhi.me` | Sample data | Example text payload used to illustrate whitespace trimming behavior |
| `main` | Entry point | Application startup method that can invoke this demonstration method |
| `Utility` | Layer | Shared helper-style code used for local demonstrations rather than business persistence or service orchestration |