Featured resource
2025 Tech Upskilling Playbook
Tech Upskilling Playbook

Build future-ready tech teams and hit key business milestones with seven proven plays from industry leaders.

Check it out
  • Lab
    • Libraries: If you want this lab, consider one of these libraries.
    • Core Tech
Labs

Challenge: Java Advanced Language Features - Using Wildcards in Method Signatures

Lab platform
Lab Info
Last updated
Nov 22, 2024
Duration
17m

Contact sales

By filling out this form and clicking submit, you acknowledge our privacy policy.
Table of Contents
  1. Challenge

    Use Wildcards in a Method Signature

    The method addMatchingElements adds elements from a source Iterable to a destination Collection if those elements are accepted by a Predicate.

    Solution

    You can find the solution to this exercise in the **CompletedExercise** directory in the filetree.
    
    To run your methods, uncomment the appropriate lines in the file `App.java` and click the **Run** button in the bottom right of the terminal.
About the author

Jesper de Jong is an independent, experienced software developer and architect who designs and builds efficient, scalable, and high-quality server-side software for the JVM in Java and Scala. He loves the creativity of inventing and building software systems and loves to teach and share his knowledge with the software development community.

Real skill practice before real-world application

Hands-on Labs are real environments created by industry experts to help you learn. These environments help you gain knowledge and experience, practice without compromising your system, test without risk, destroy without fear, and let you learn from your mistakes. Hands-on Labs: practice your skills before delivering in the real world.

Learn by doing

Engage hands-on with the tools and technologies you’re learning. You pick the skill, we provide the credentials and environment.

Follow your guide

All labs have detailed instructions and objectives, guiding you through the learning process and ensuring you understand every step.

Turn time into mastery

On average, you retain 75% more of your learning if you take time to practice. Hands-on labs set you up for success to make those skills stick.

Get started with Pluralsight