Basics of Java (IV).

Fig. Code execution in VS Code, of Java app in folder 'course_java_iv_challenge_app_api_star_wars'.

Final delivery of the 4th course: 'Java: consumir API, escribir archivos y manejar errores', from module (a.k.a. 'formación' in spanish) 'Java Orientado a Objetos G9 - ONE', of Alura LATAM. Part of ORACLE Next Education (ONE) education program, in LATAM.

This final delivery consists of 2 projects, each one in it's own folder (using folders structure of Maven's java build automation tool):

• Course exercise; in folder: course_java_iv.
• Course challenge of a shopping app; in folder: course_java_iv_challenge_app_api_star_wars.

Note

This README is mainly written in english (en), but it might have some sections in spanish (sp), since course content is in spanish.

ℹ About.

The course covered topics such as:

• Use of open APIs, such as:
  • OMDb API, an Open RESTful web service to obtain movie information: 'https://www.omdbapi.com'.
  • SWAPI, an Open API for Star Wars lore and information about it's universe: 'https://swapi.dev/'.
• Connection with APIs (Application Programming Interface) and practicing how to connect to them.
  • Use of HTTP protocol.
  • Understanding responses in JSON format.
• Getting to know tools for developing and testing APIs, such as:
  • Postman: 'https://www.postman.com'.
  • Insomnia: 'https://insomnia.rest'.
  • Apidog: 'https://apidog.com'.
• Understanding the HTTP (HyperText Transfer Protocol) protocol:
  • Communication model of client-server.
  • Common methods: GET, POST, PUT, DELETE.
  • Statuses: 1xx (informative), 2xx (success), 3xx (redirects), 4xx (client's errors), 5xx (server's errors).
• Getting to know design patterns; a concept from 90's:
  • Creation pattern: e.g. 'Factory Method', 'Builder', and 'Singleton'.
  • Structure pattern: e.g. 'Adapter', 'Facade', and 'Composite'.
  • Behavioural pattern: e.g. 'Observer', 'Command', and 'Strategy'.
• Using Java packages / libraries to manage API connections: HTTP requests, and JSONs responses.
  • HTTP requests: java.net library (HttpClient, HttpRequest, URI, HttpResponse).
    • Documentation for reference: 'https://docs.oracle.com/en/java/javase/17/docs/api/java.net.http/java/net/http/package-summary.html'.
  • JSON conversion (serialization and de-serialization) from and to Java objects: com.google.gson library (Gson, GsonBuilder).
    • Documentation for reference: 'https://github.com/google/gson', 'https://www.javadoc.io/doc/com.google.code.gson/gson/latest/com.google.gson/module-summary.html'.
• Use of Java Records, as an 'intermediate' class to facilitate managing mapping of JSON fields from responses to project's classes and attributes: 'https://docs.oracle.com/en/java/javase/16/language/records.html'.
• Use of Exceptions to handle possible errors in code execution.
  • Use of try-catch blocks vs. throws keyword in class definition: 'https://medium.com/@AlexanderObregon/java-exception-handling-throws-vs-try-catch-94b0abe1080d'.
  • Understanding exceptions hierarchy: Throwable < Error | (Exception < RuntimeException). This implies to start catches with more specific exceptions, until you get to the more 'general' (or superclass); e.g. RuntimeException BEFORE Exception.
  • Using 'multi-catch' to group catch of several types of exceptions.
  • Creating own Exception for exercise purposes.
• Exporting local files in several formats, such as .txt and .json, using package / library java.io (FileWriter): 'https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/io/FileWriter.html'.

🥇 Course Certificate of Completion.

Available at 'https://app.aluracursos.com/certificate/4f043ea5-83f6-4f85-982d-111c1778ddca'.

• Estimated workload: 8h.
• Activities: 51.
• Topics:
  1. 'Requests y responses'.
  2. 'Utilizando una biblioteca externa'.
  3. 'Lidiando con excepciones'.
  4. 'Persistiendo datos en archivos'.
  5. 'Consolidando conocimientos'.

🔗 Links to program resources.

PROGRAM STRUCTURE.

• [Course] 'Java: consumir API, escribir archivos y manejar errores': 'https://app.aluracursos.com/course/java-consumir-api-escribir-archivos-manejar-errores'.
• [Module] 'Java Orientado a Objetos G9 - ONE': 'https://app.aluracursos.com/formacion-java-grupo9-one/'.
• ORACLE Next Education (ONE) education program, in LATAM: 'https://www.oracle.com/co/education/oracle-next-education/'.
• Alura LATAM education platform: 'https://www.aluracursos.com/'.

COURSE RESOURCES.

• GitHub's project repository: 'https://github.com/alura-es-cursos/2047-screenmatch4'.
  • Branch for course exercises: Aula1 to Aula4. Ref.: 'https://github.com/alura-es-cursos/2047-screenmatch4/tree/Aula1'.
  • Repo for course challenge. Ref.: 'https://github.com/alura-es-cursos/2047-starwarsapi/tree/master'.

🐾 Notes About Project.

Note

This section is only for reference, for documentation purposes in case of re-visiting course notes.

No aditional notes.

🤝 Contributors.

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📜 Authors.

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