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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 1. Text Blocks, Locales, Numbers, and Math 2. Objects, Immutability, Switch Expressions, and Pattern Matching 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

196. Throwing checked exceptions from lambdas

Let's suppose that we have the following lambda:

static void readFiles(List<Path> paths) {
  paths.forEach(p -> {
    try {
      readFile(p);
    } catch (IOException e) {
      ... // what can we throw here?
    }
  });
}

What can we throw in the catch block? Everybody knows the answer … we can throw an unchecked exception such as RuntimeException:

static void readFiles(List<Path> paths) {
  paths.forEach(p -> {
    try {
      readFile(p);
    } catch (IOException e) {
      throw new RuntimeException(e);
    }
  });
}

Also, everybody knows that we cannot throw a checked exception such as IOException. The following snippet of code will not compile:

static void readFiles(List<Path> paths) {
  paths.forEach(p -> {
    try {
      readFile(p);
    } catch (IOException e) {
      throw new IOException(e);
    }
  });
}

Can we change this rule? Can we come up with a hack that allows us to throw checked...

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