- Lab
-
Libraries: If you want this lab, consider one of these libraries.
- Core Tech

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

Lab Info
Table of Contents
-
Challenge
Use Wildcards in a Method Signature
The method
addMatchingElements
adds elements from a sourceIterable
to a destinationCollection
if those elements are accepted by aPredicate
.Solution
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.You can find the solution to this exercise in the **CompletedExercise** directory in the filetree.
About the author
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.