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Learn how to effectively implement multithreading in Java by executing multiple classes simultaneously to enhance your programs.
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Running Multiple Classes in Java Using Multithreading

Java is a powerful programming language that supports multithreading, allowing multiple processes to run simultaneously. This feature can enhance the performance and responsiveness of your applications. In this guide, we will address a common problem faced by new developers: how to run two classes simultaneously in the main method while also ensuring accurate output from user input.

Understanding the Problem

When you're new to programming, you may face challenges in coordinating tasks that need to occur at the same time. For instance, in your Java program, you want to utilize both a timer and a user input checker concurrently. The provided classes are:

Timer: Responsible for timing events.

ChecksUserInput: Captures and processes user input.

The existing implementation of your main.java calls these classes sequentially, which means they won't run concurrently.

The Current Code Snippet

Here’s a snippet of your existing main.java code:

[[See Video to Reveal this Text or Code Snippet]]

As it stands, the classes execute one after the other, not simultaneously.

The Solution: Implementing Multithreading

To enable multithreading in your Java application, you can utilize the Thread class. Here’s a simplified approach to allow both the Timer and ChecksUserInput classes to run concurrently.

Steps to Implement Multithreading

Create Thread Instances: For each class you want to run in a separate thread, you need to create a new thread instance.

Start the Threads: Use the start() method to begin the execution of the threads.

Revised Main Code

Here’s how you can effectively implement your main.java to achieve concurrent execution:

[[See Video to Reveal this Text or Code Snippet]]

Explanation of the Revised Code

Anonymous Threads: The Thread class is used with anonymous functions (lambdas) that encapsulate the logic of what each thread should execute.

Starting Threads: The start() method initializes the threads and begins their execution.

Concurrency: When executed, Timer and ChecksUserInput run side-by-side, effectively allowing your timer to capture time while simultaneously waiting for user input.

Improving User Input Handling

Additionally, you expressed a need to correctly print out the word length in the ChecksUserInput class.

Modifying the ChecksUserInput Class

Make sure you correctly capture and process the user’s input within the method. For example, let’s slightly adjust your UserInput and run method:

[[See Video to Reveal this Text or Code Snippet]]

Key Adjustments

Input Handling: Close the Scanner after capturing input to prevent resource leaks.

Return Length: Directly return the word length without unnecessary steps.

Conclusion

By following these suggestions, you can successfully run multiple classes simultaneously in Java using multithreading. This not only enhances the user experience but also boosts the efficiency of your application. Happy coding! If you have more questions about Java or programming in general, feel free to ask!