---
# (DD16) 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 routine that showcases the JDK 11 `String.strip()` capability on a sample text value. From a business perspective, it represents a presentation-oriented utility used to illustrate how leading and trailing whitespace can be removed from user-facing text before display or further processing. The method does not branch into multiple service types or apply business rules; instead, it follows a simple sequential flow that prepares a sample input, prints a contextual header, and emits the stripped result to the console. Its design pattern is best described as a direct demonstration/utility invocation pattern, where the method orchestrates a single example rather than performing reusable domain logic. Within the larger system, it serves as an educational sample in the Java 11 examples package and is likely called from a main entry point or commented-out test harness to show language feature behavior.

## 2. Processing Pattern (Detailed Business Logic)

```mermaid
flowchart TD
START(["demonstrateStringStrip()"])
SET1["Set originalString = \"  biezhi.me  23333  \""]
CALL1["writeHeader(\"String.strip() on '...')"]
CALL2["originalString.strip()"]
CALL3["System.out.println(...) "]
END_NODE(["Return / Next"])
START --> SET1
SET1 --> CALL1
CALL1 --> CALL2
CALL2 --> CALL3
CALL3 --> END_NODE
```

The method executes one linear path only: it initializes a sample string containing leading and trailing spaces, writes a header describing the feature being demonstrated, applies `strip()` to remove surrounding whitespace, and prints the result with surrounding quotes for visibility. There are no conditional branches, loops, or alternate routes. Because the method is a demo wrapper, the method call to `writeHeader(...)` is a presentation step, while `originalString.strip()` is the core JDK 11 feature being demonstrated.

## 3. Parameter Analysis

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

External state and instance fields read by the method: none. The method uses only a locally declared sample string and static console output, so it does not depend on object state, request context, or persistent data.

## 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 |
|------|----------|---------|-------------|----------------------|
| - | `Example.writeHeader` | Example | - | Prints a formatted header line for the string-strip demonstration |
| - | `String.strip` | JDK 11 String API | - | Removes leading and trailing whitespace from the sample string for display |
| - | `System.out.println` | Java Standard Library | Console output | Writes the stripped result to standard output |

## 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` (commented invocation at line 107) | `Example.main` comment reference -> `Example.demonstrateStringStrip` | `writeHeader [R] Console header` |

There are no active Java callers discovered beyond the commented-out invocation inside the same class. The method’s terminal behavior is limited to console formatting and string normalization; it does not reach database or service endpoints.

## 6. Per-Branch Detail Blocks

**Block 1** — [SEQUENTIAL FLOW] (L49-L54)

> Demonstration flow that prepares the sample value, prints the heading, and outputs the trimmed result.

| # | 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() + "'");` |

## 7. Glossary

| Term | Type | Business Meaning |
|------|------|------------------|
| `strip` | Method | JDK 11 string operation that removes leading and trailing whitespace from text |
| `String` | Type | Java text value used to hold the demo input and output |
| `writeHeader` | Method | Local helper used to print a descriptive header for the console example |
| `System.out.println` | Method | Standard output routine used to display the processed string |
| `biezhi.me` | Sample value | Example domain-like text embedded in the demo string |
| whitespace | Business term | Blank characters at the start or end of the string that the demo removes |
| JDK 11 | Platform | Java runtime version that introduced `String.strip()` as part of the language/library update |
| Utility | Layer | Non-domain helper code that demonstrates platform behavior rather than business transactions |