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Java Coding Problems - Second Edition

You're reading from  Java Coding Problems - Second Edition

Product type Book
Published in Mar 2024
Publisher Packt
ISBN-13 9781837633944
Pages 798 pages
Edition 2nd Edition
Languages
Author (1):
Anghel Leonard Anghel Leonard
Profile icon Anghel Leonard

Table of Contents (16) Chapters

Preface Text Blocks, Locales, Numbers, and Math Objects, Immutability, Switch Expressions, and Pattern Matching Working with Date and Time Records and Record Patterns Arrays, Collections, and Data Structures Java I/O: Context-Specific Deserialization Filters Foreign (Function) Memory API Sealed and Hidden Classes Functional Style Programming – Extending APIs Concurrency – Virtual Threads and Structured Concurrency Concurrency ‒ Virtual Threads and Structured Concurrency: Diving Deeper Garbage Collectors and Dynamic CDS Archives Socket API and Simple Web Server Other Books You May Enjoy
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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