---
# (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 self-contained demonstration routine for the JDK 11 `String.stripLeading()` API. Its business purpose is to show how a display string is normalized by removing only the leading whitespace while preserving the original trailing whitespace and the core content for comparison. The method prepares a sample string, emits a descriptive header for the console output, and then prints the transformed result so that a reader or tester can observe the exact effect of the API.

From a system perspective, this method belongs to a string-utility sample suite rather than a transactional business workflow. It does not branch by service type, does not persist data, and does not route to downstream services; instead, it follows a simple demonstration pattern: initialize example input, label the output, and present the transformed value. The role of the method in the larger system is educational and diagnostic, serving as an executable reference for developers who want to verify or understand the behavior of `stripLeading()` in Java 11.

## 2. Processing Pattern (Detailed Business Logic)

```mermaid
flowchart TD
    START["demonstrateStringStripLeading()"]
    STEP1["Set originalString = '  biezhi.me  23333  '"]
    STEP2["Call writeHeader('String.stripLeading() on ' + originalString)"]
    STEP3["Print originalString.stripLeading() wrapped in single quotes"]
    END_NODE["Return / Next"]
    START --> STEP1
    STEP1 --> STEP2
    STEP2 --> STEP3
    STEP3 --> END_NODE
```

**CRITICAL — Constant Resolution:**
No external constant class is referenced in this method. The only literal value used for demonstration is the inline sample string `"  biezhi.me  23333  "`.

## 3. Parameter Analysis

| No | Parameter Name | Type | Business Description |
|----|---------------|------|----------------------|
| - | (none) | - | This method accepts no parameters. It uses only locally defined sample data to demonstrate leading-whitespace removal. |

External state read by the method:
- The method invokes `writeHeader(...)`, which reads shared output behavior from the enclosing `Example` class.
- It writes to standard output via `System.out.println(...)`.

## 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.
Use the pre-computed evidence above. If SC Code or Entity/DB is missing, try to infer from:
- The **SC Code** (Service Component code, e.g., `EKK0361A010SC`, `EKK1081D010CBS`) — look at the class name of the called method or its containing class.
- The **Entity/DB tables** — search for table name constants (often `KK_T_*` pattern), SQL references, or entity names in the called method's source code.

| CRUD | SC / CBS | SC Code | Entity / DB | Operation Description |
|------|----------|---------|-------------|----------------------|
| - | `writeHeader` | Example | - | Writes a console banner that labels the demonstration output for `String.stripLeading()`. |
| - | `System.out.println` | JDK Runtime | STDOUT | Emits the stripped string to the console for visual verification. |

## 5. Dependency Trace

Trace who calls this method and what this method ultimately calls.
Use the pre-computed evidence and caller search results from Step 2 above.

| # | Caller (Screen/Batch) | Call Chain (Full Path to this Method) | Terminal (SC / CRUD / Entity) |
|---|----------------------|--------------------------------------|-------------------------------|
| 1 | `Example.main` (commented invocation) | `Example.main` -> `Example.demonstrateStringStripLeading` | `writeHeader [R?] Example` / `System.out.println [D?] STDOUT` |

## 6. Per-Branch Detail Blocks

This method has no conditional branches, loops, or exception handling blocks. The execution is strictly sequential.

**Block 1** — [SEQUENCE] `(initialize sample input)` (L59)

> Prepares the demonstration string used to show leading-whitespace stripping.

| # | Type | Code |
|---|------|------|
| 1 | SET | `String originalString = "  biezhi.me  23333  ";` |

**Block 2** — [SEQUENCE] `(print header)` (L61)

> Writes a descriptive title so the console output can be understood in context.

| # | Type | Code |
|---|------|------|
| 1 | CALL | `writeHeader("String.stripLeading() on '" + originalString + "'");` |

**Block 3** — [SEQUENCE] `(print transformed result)` (L62)

> Applies `stripLeading()` and prints the result surrounded by quotes to make whitespace differences visible.

| # | Type | Code |
|---|------|------|
| 1 | EXEC | `System.out.println("'" + originalString.stripLeading() + "'");` |

## 7. Glossary

| Term | Type | Business Meaning |
|------|------|------------------|
| `stripLeading` | API method | JDK 11 string function that removes leading whitespace characters from a string while leaving trailing whitespace unchanged. |
| `originalString` | Local variable | Sample input string used to demonstrate how leading whitespace is removed. |
| `writeHeader` | Helper method | Shared console formatting routine that prints a descriptive heading for the sample output. |
| `System.out.println` | Technical API | Standard output print operation used to display the demonstration result in the console. |
| whitespace | Business term | Space characters at the beginning or end of a string; in this method, only the leading whitespace is removed. |
| JDK 11 | Platform term | Java Development Kit version 11, which introduced `String.stripLeading()`. |
| `biezhi.me` | Sample text | Example payload embedded in the demonstration string to show that the central content remains intact. |
| `Example` | Class | Utility/demo class that hosts string API examples for console-based verification. |