Overview Java BinaryOperator is a functional interface extending BiFunction. As you may recall, BiFunction has one abstract method called apply that accepts two arguments and returns a result. A BinaryOperator is a special case of a BiFuncion where the types of the arguments and the return value are the same. Thus, this is the signature … Read more
Overview Hashtable and HashMap are common data structures to store key-value data in your Java application. While having similarities, there are some crucial differences you need to know as a Java developer. Let’s discuss the differences between these two data structures in this post. Hashtable is thread-safe, HashMap is not Consider the following code using … Read more
Overview While preparing for the OCP 17 exam, I created some notes to aid my learning. This is the first of many posts in this series. I hope you find it helpful. Java Exception Handling Cheat Sheet The Throwable family Checked vs. unchecked exceptions Overriding methods with declared exceptions Example RuntimeException Checked exceptions Error Exception … Read more
Overview Recently, for the first time, I encounter a need to use an interface in @RequestBody in my Spring Boot app. Here is the diagram: This is the request that contains one IAudioContent However, when I sent a request to create a question group with TTSSingleRequest in JSON format for example, I got the following … Read more
Overview Spring Boot 3 came out with a lot of promises. The most prominent thing is the native image build. I currently deploy my apps as a fat jar in containers with JRE and it took around 20s to boot up. Thus, I would love to try the native build to see if is there … Read more
Introduction If you run the following code: There are chances you will get the following exception: I said “there are chances” because you run the same code repeatedly, and sometimes there is no exception thrown. So, what is ConcurrentModificationException and when you might encounter it. The JDK’s said: This exception may be thrown by methods … Read more