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Java Coding Problems

You're reading from   Java Coding Problems Become an expert Java programmer by solving over 250 brand-new, modern, real-world problems

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Product type Paperback
Published in Mar 2024
Publisher Packt
ISBN-13 9781837633944
Length 798 pages
Edition 2nd Edition
Languages
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Author (1):
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Anghel Leonard Anghel Leonard
Author Profile Icon Anghel Leonard
Anghel Leonard
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Toc

Table of Contents (16) Chapters Close

Preface 1. Text Blocks, Locales, Numbers, and Math 2. Objects, Immutability, Switch Expressions, and Pattern Matching FREE CHAPTER 3. Working with Date and Time 4. Records and Record Patterns 5. Arrays, Collections, and Data Structures 6. Java I/O: Context-Specific Deserialization Filters 7. Foreign (Function) Memory API 8. Sealed and Hidden Classes 9. Functional Style Programming – Extending APIs 10. Concurrency – Virtual Threads and Structured Concurrency 11. Concurrency ‒ Virtual Threads and Structured Concurrency: Diving Deeper 12. Garbage Collectors and Dynamic CDS Archives 13. Socket API and Simple Web Server 14. Other Books You May Enjoy
15. Index

88. Implementing interfaces in records

Java records cannot extend another class but they can implement any interface exactly as a typical class. Let's consider the following interface:

public interface PestInspector {
  public default boolean detectPest() {
    return Math.random() > 0.5d;
  }
  public void exterminatePest();
}

The following snippet of code is a straightforward usage of this interface:

public record MelonRecord(String type, float weight)  
       implements PestInspector {
      
  @Override
  public void exterminatePest() { 
     
    if (detectPest()) {
      System.out.println("All pests have been exterminated");
    } else {
      System.out.println(
        "This melon is clean, no pests have been found");
    }
  }
}

Notice that the code overrides the abstract method exterminatePest() and calls the default method detectPest().

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