A frequently asked question in a Java interview is: How to implement a Java HashMap? Java job seekers must fully grok this important concept if they want to ace the interview. The HashMap tutorial ...

This is a simple Java console application for an online shopping system. It allows users to log in, buy products, cancel products, display all products, and log out. The application uses a HashMap to ...

Java is one of those OOPs based languages, along with Python and C++, that’s in demand right now. So, if you want to ride the bandwagon and use the language, you must download it on your system. Not ...

While the Hashtable was part of the initial Java release over two decades ago, the HashMap is the correct key-value store to use today. One key HashMap vs. Hashtable difference is the fact that the ...

在淘宝内网里看到同事发了贴说了一个CPU被100%的线上故障，并且这个事发生了很多次，原因是在Java语言在并发情况下使用HashMap造成Race Condition，从而导致死循环。这个事情我4、5年前也经历过，本来觉得没什么好写的，因为Java的HashMap是非线程安全的，所以在 ...

A colleague of mine recently ran into an issue that I have not run into myself, but found to be interesting and, in my opinion, worth blogging about here. During some distributed Java development, my ...