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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. Declaring a Java record

Before diving into Java records, let’s think a little bit about how we commonly hold data within a Java application. You’re right … we define simple classes containing the needed instance fields populated with our data via the constructors of these classes. We also expose some specific getters, and the popular equals(), hashCode(), and toString() methods. Further, we create instances of these classes that wrap our precious data and we pass them around to solve our tasks all over our application. For instance, the following class carries data about melons like the melon types and their weights:

public class Melon {
  private final String type;
  private final float weight;
  public Melon(String type, float weight) {
    this.type = type;
    this.weight = weight;
  }
  public String getType() {
    return type;
  }
  public float getWeight() {
    return weight;
  }
  // hashCode(), equals(), and to String()
}

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