For your Portfolio Project, you will demonstrate an understanding of the various concepts discussed in each module. For the second part of your Portfolio Project, you will create a Java application that will exhibit concurrency concepts. Your application should create two threads that will act as counters. One thread should count up to $20.$ Once thread one reaches $20,$ then a second thread should be used to count down to $0.$ For your created code, please provide a detailed analysis of appropriate concepts that could impact your application. Specifically, please address:

Performance issues with concurrency

Vulnerabilities exhibited with use of strings

Security of the data types exhibited.

Provide a detailed comparison between the performance implementations between the Java and C$++$ versions of your applications. Which implementation may be considered less vulnerable to security threats and why? Your detailed comparison should be $3-4$ pages in length.