---

# (DD16) Business Logic — Example.demonstrateStringStripTrailing() [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.demonstrateStringStripTrailing()

This method is a small demonstration routine that showcases the JDK 11 `String.stripTrailing()` API against a fixed sample text. From a business perspective, it illustrates how the platform can remove only trailing whitespace from a value while preserving leading whitespace and the core content of the string. The method does not branch by service type, route requests, or manipulate business entities; instead, it serves as an educational utility for validating and explaining Java 11 string behavior.

In the larger system, the method acts as a sample entry point within the `string` examples package. Its role is to produce a human-readable header and then print the transformed string so that developers or testers can compare original versus normalized output. The implementation follows a simple linear execution pattern and demonstrates direct delegation to the standard library rather than custom business logic. Because there are no conditional paths, all execution follows the same single processing path.

## 2. Processing Pattern (Detailed Business Logic)

```mermaid
flowchart TD
START(["demonstrateStringStripTrailing()"])
INIT["Set originalString to the sample text"]
CALL["Call writeHeader with the method label"]
PRINT["Print originalString.stripTrailing() surrounded by quotes"]
END_NODE(["Return / Next"])
START --> INIT
INIT --> CALL
CALL --> PRINT
PRINT --> END_NODE
```

**CRITICAL — Constant Resolution:**
This method does not reference any application constants or constant-based branch conditions.

## 3. Parameter Analysis

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

External state read by the method:
- No instance fields are read.
- The method uses a local sample string only.
- The only external dependency is the inherited or sibling utility method `writeHeader(...)` invoked for presentation output.

## 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 |
|------|----------|---------|-------------|----------------------|
| R | `Example.writeHeader` | Example | - | Writes a formatted header line for the string-strip demonstration |
| R | `String.stripTrailing` | JDK 11 String API | - | Returns the sample text with trailing whitespace removed while preserving leading whitespace |
| R | `System.out.println` | JDK Runtime Library | - | Outputs the transformed value to the console for demonstration purposes |

## 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` | `Example.demonstrateStringStripTrailing` | `writeHeader [R] -` |
| 2 | `Example` | `Example.demonstrateStringStripTrailing` | `String.stripTrailing [R] -` |
| 3 | `Example` | `Example.demonstrateStringStripTrailing` | `System.out.println [R] -` |

## 6. Per-Branch Detail Blocks

**Block 1** — [SEQUENCE] `(method entry)` (L69)

> Initializes the demonstration flow for the JDK 11 trailing-whitespace example.

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

**Block 2** — [SEQUENCE] `(header output)` (L71)

> Produces the title line that identifies the API being demonstrated.

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

**Block 3** — [SEQUENCE] `(result output)` (L72)

> Applies the standard library trailing-trim operation and prints the visible result with quote delimiters.

| # | Type | Code |
|---|------|------|
| 1 | EXEC | `originalString.stripTrailing()` |
| 2 | CALL | `System.out.println("'" + originalString.stripTrailing() + "'");` |

## 7. Glossary

| Term | Type | Business Meaning |
|------|------|------------------|
| `stripTrailing()` | API | JDK 11 string operation that removes trailing whitespace from the end of a text value |
| `writeHeader` | Utility method | Presentation helper that prints a formatted title for a sample execution |
| `originalString` | Local variable | Sample input text used to demonstrate trailing whitespace handling |
| `String` | Java class | Immutable text type used for the demonstration |
| `System.out.println` | Runtime API | Console output operation used to display the resulting string |
| `JDK 11` | Platform version | Java runtime release that introduced `String.stripTrailing()` |
| trailing whitespace | Technical term | Spaces or other whitespace characters at the end of a string |
| leading whitespace | Technical term | Spaces or other whitespace characters at the beginning of a string, preserved by `stripTrailing()` |
| `biezhi.me` | Sample content | Literal business-agnostic sample text embedded in the example |