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

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

## 1. Role

### Example.demonstrateStringStrip()

This method is a demonstration utility that showcases the `String.strip()` method introduced in JDK 11. It illustrates the business value of trimming both leading and trailing whitespace from a string in a single operation — a common data-cleansing task encountered across many systems (e.g., normalizing user input, cleaning file paths, or sanitizing log entries). The method follows a **showcase/demo pattern**, serving as a runnable example within the broader `java11-features` library that documents new JDK 11 API additions. It acts as a self-contained entry point: when executed, it prints a header describing the operation and the resulting stripped string to standard output. There are no conditional branches, no business data persistence, and no integration with external services — it is purely a demonstrative utility.

## 2. Processing Pattern (Detailed Business Logic)

```mermaid
flowchart TD
    START(["demonstrateStringStrip()"])
    STEP1(["Declare String originalString = \"  biezhi.me  23333  \""])
    STEP2(["Call writeHeader with formatted header string"])
    STEP3(["Call System.out.println with stripped output"])
    END_NODE(["End / Return"])

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

**Processing description:**

1. **Step 1** — Declare a local variable `originalString` containing the test value `"  biezhi.me  23333  "` with leading and trailing spaces.
2. **Step 2** — Invoke `writeHeader()` to print a descriptive header to standard output, interpolating the original string so the user can see the input before and after stripping.
3. **Step 3** — Call `String.strip()` on the original string and print the result to `System.out`. The `strip()` method removes all leading and trailing Unicode whitespace characters (code points <= ` `).

## 3. Parameter Analysis

| No | Parameter Name | Type | Business Description |
|----|---------------|------|---------------------|
| - | (none) | - | This method accepts no parameters and has no side effects beyond standard output. |

**External / instance state:**
- `writeHeader(String)` — a static helper method defined in the same `Example` class that writes a formatted header line (with divider separators) to standard output.
- `System.out` — the standard output stream used for demo logging.

## 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` to print a formatted header to stdout |

### Called method details:

| CRUD | SC / CBS | SC Code | Entity / DB | Operation Description |
|------|----------|---------|-------------|----------------------|
| - | `Example.writeHeader` | Example | - | Prints a formatted header string to standard output (demo logging, no CRUD) |
| - | `System.out.println` | java.lang | - | Writes the stripped string result to standard output (demo logging, no CRUD) |

**Classification rationale:**
- This method performs no Create, Read, Update, or Delete operations.
- It is purely a demonstrative utility that writes output to `System.out`.

## 5. Dependency Trace

| # | Caller (Screen/Batch) | Call Chain (Full Path to this Method) | Terminal (SC / CRUD / Entity) |
|---|----------------------|--------------------------------------|-------------------------------|
| 1 | (commented out in Example) | `Example.demonstrateXXX` -> `demonstrateStringStrip` (commented at L107) | none |

**Notes:**
- The only references to `demonstrateStringStrip()` in the codebase are within the same `Example` class at lines 107–109, where the method call is present but **commented out**.
- This method is not invoked by any production code, screen, batch, or controller.
- It is intended to be executed manually as part of the JDK 11 feature demo suite.

## 6. Per-Branch Detail Blocks

This method has no conditional branches, loops, or exception handling. It executes sequentially.

**Block 1** — [LINEAR EXECUTION] `(no condition)` (L49)

> Method body — sequential demonstration of `String.strip()`

| # | Type | Code |
|---|------|------|
| 1 | SET | `String originalString = "  biezhi.me  23333  "` |
| 2 | EXEC | `writeHeader("String.strip() on '" + originalString + "'")` |
| 3 | RETURN | `System.out.println("'" + originalString.strip() + "'")` |

## 7. Glossary

| Term | Type | Business Meaning |
|------|------|------------------|
| `String.strip()` | API | JDK 11 method that removes leading and trailing whitespace characters (Unicode code points <= U+0020) from a string |
| `String.stripLeading()` | API | JDK 11 method that removes only leading whitespace from a string |
| `String.stripTrailing()` | API | JDK 11 method that removes only trailing whitespace from a string |
| whitespace | Technical | Unicode whitespace characters (space, tab, newline, etc.) — `strip()` removes those with code point value <= 0x20 |
| `writeHeader` | Utility | Helper method in the same `Example` class that prints a formatted header with divider lines to standard output |
| JDK 11 | Platform | Java Development Kit version 11 — the Java release that introduced `String.strip()`, `String.isBlank()`, `String.repeat()`, and other string-related APIs |

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*Generated automatically from source code analysis. Lines: 49–54 (6 LOC). FQN: `io.github.biezhi.java11.string.Example`.*