
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Transcribed Image Text:### Java Programming Exercise: Eliminating Redundancy with Static Methods
#### Objective:
Write a complete Java program in a class named `TwoRockets` that generates the following output. Use static methods to show structure and eliminate redundancy in your solution.
#### Instructions:
Note that there are two rocket ships next to each other. Analyze the redundancy in the pattern below. How can you use static methods to eliminate redundancy efficiently? Also, recognize which parts of the redundancy cannot be eliminated.
#### Expected Output:
```
/\
/ \
/ \
+------+ +------+
| | | |
|United| |United|
|States| |States|
| | | |
+------+ +------+
/\
/ \
/ \
```
#### Analysis:
The output features two rocket ships side-by-side, each constructed from ASCII art. There are several repeating elements:
1. The top portions of the rockets (the triangles).
2. The rocket body sections, including the edges and the United States text section.
3. The bottom portions of the rockets (also triangles similar to the top).
Using static methods, we can eliminate redundant code by defining each unique section of the rocket once and calling these methods where needed to construct the full image.
#### Discussion Points:
1. **Redundancy Elimination:**
- Define methods for drawing the top triangle, the body, and the bottom triangle.
- Call these methods twice to compose the two-side-by-side rockets.
2. **Irreducible Redundancy:**
- Note that you still need to call the methods to draw each part twice (once for each rocket).
- The symmetry and identical nature of the two rockets make it unavoidable to repeat some calls.
### Conclusion:
By identifying the repeating elements and structuring these into methods, you simplify the code and improve its readability. The goal is to reduce code duplication while maintaining clarity and efficiency. Explore how to invoke methods that draw each part to illustrate the complete rockets side by side.
This exercise reinforces the practice of reducing redundancy and enhancing code maintainability in Java programming through the utilization of static methods.
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