# (DD18) Business Logic — Example.demonstrateStringStrip() [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.demonstrateStringStrip()

This method is a small demonstration utility that showcases the JDK 11 `String.strip()` behavior using a fixed sample value. It prepares a test string that contains leading and trailing spaces, writes a descriptive header for the console output, and then prints the trimmed result so that the effect of Unicode-aware whitespace removal can be observed directly. In business terms, it functions as an instructional example rather than a production transformation routine; its purpose is to validate and explain how text normalization behaves when the application must remove incidental padding from user-facing strings. The method has no branching logic, no persistence, and no external system interaction, so it is best understood as a presentation-layer helper in a feature showcase module. Its role in the larger system is to support learning, verification, or documentation of Java 11 string capabilities for developers or testers reading the sample output.

## 2. Processing Pattern (Detailed Business Logic)

```mermaid
flowchart TD
    START["demonstrateStringStrip()"]
    STEP1["Set originalString to sample text with surrounding spaces"]
    STEP2["Call writeHeader with strip demo title"]
    STEP3["Call originalString.strip() to remove leading and trailing whitespace"]
    STEP4["Print stripped string wrapped in single quotes"]
    END_NODE["Return"]
    START --> STEP1
    STEP1 --> STEP2
    STEP2 --> STEP3
    STEP3 --> STEP4
    STEP4 --> END_NODE
```

**CRITICAL — Constant Resolution:**
The method does not branch on any named constants and does not reference any external constant file. Its only literal values are the sample string and the console header text embedded directly in the method body.

## 3. Parameter Analysis

| No | Parameter Name | Type | Business Description |
|----|---------------|------|---------------------|
| - | (none) | - | This method accepts no parameters. It operates entirely on local sample data and static console output formatting. |

External state read by the method:
- No instance fields are read.
- No external mutable state, database state, or request context is accessed.
- The method only reads the local variable `originalString` and the return value from `String.strip()`.

## 4. CRUD Operations / Called Services

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

| CRUD | SC / CBS | SC Code | Entity / DB | Operation Description |
|------|----------|---------|-------------|----------------------|
| - | `Example.writeHeader` | Example | - | Writes a console header for the string-strip demonstration |

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 |
|------|----------|---------|-------------|----------------------|
| R | `Example.writeHeader` | Example | - | Produces a formatted console header used to label the output of the string-strip sample. |
| R | `String.strip` | JDK 11 String API | - | Reads the current string value and returns a whitespace-trimmed representation without mutating the original string. |

## 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 | Internal demo only | `Example.main` (commented out) -> `Example.demonstrateStringStrip` | `writeHeader [R] console output` |

**Instructions:**
- Use `search_files` with pattern `**/*.java` and content_pattern `demonstrateStringStrip` to find all callers.
- For each caller, identify if it's a Screen (class name contains `KKSV*`, `Screen*`), Batch, Controller, or CBS.
- Build the full call chain from the entry point to this method.
- Each row = one unique entry point. Show ALL found callers (up to 15 rows).
- The Terminal column lists ALL CRUD endpoints reached FROM this method.
- Format terminal as: `methodName [C/R/U/D] EntityOrTableName`
- If a caller class name matches `KKSV\d{4}`, format as `Screen:KKSVxxxx`.

## 6. Per-Branch Detail Blocks

The method contains no conditional branches, loops, or exception handling. It executes as a straight-line demonstration block.

**Block 1** — [SEQUENCE] `(lines 49-54)`

> Demonstrates Java 11 whitespace trimming by printing a sample string before and after `String.strip()`.

| # | Type | Code |
|---|------|------|
| 1 | SET | `String originalString = "  biezhi.me  23333  ";` |
| 2 | CALL | `writeHeader("String.strip() on '" + originalString + "'");` |
| 3 | EXEC | `originalString.strip()` |
| 4 | CALL | `System.out.println("'" + originalString.strip() + "'");` |
| 5 | RETURN | `}` |

## 7. Glossary

| Term | Type | Business Meaning |
|------|------|------------------|
| `originalString` | Field | Local sample text used to demonstrate trimming behavior; contains leading and trailing whitespace. |
| `strip` | Technical term | JDK 11 string method that removes leading and trailing whitespace based on Unicode whitespace rules. |
| `writeHeader` | Utility method | Console formatting helper that prints a title line for the sample output. |
| `String` | Technical type | Java standard string type used to hold text values. |
| whitespace | Business term | Blank characters such as spaces that may be intentionally or unintentionally present around text values. |
| console output | Technical term | Text written to standard output for demonstration or debugging purposes. |
| JDK 11 | Platform | Java Development Kit version 11, which introduces the `String.strip()` API used by this example. |
| sample string | Business term | Fixed example value used only to illustrate behavior; not derived from user input or database data. |