This article is to recap some common runtime exceptions in Java. It is an important habit to consider exceptions before writing and then deal with them to avoid unintended exceptions during program execution. UnsupportedOperationException Happens when an operation is not supported, often because the implementation does not provide support for

I just want to record the difference between Arrays.asList() and List.of(), as they are used in one of my technical interviews. The purpose is simple : creating a List and manipulating it with stream (nowadays it's much faster to write a collection with stream), and these two

Just delve deeper into Java Streams because I find them very convenient to use. What is Stream API? Stream API is an operation executed on collection, so when we read the code, we can comprehend the code very quickly. It is also called pipelined operation. .filter() .skip() .limit() .distinct() .sorted(

Srping Boot is a solution to * minimize manual config process * provide auto-config based on props files and JAR classpath * resolve dependency conflicts (Maven and Gradle) * provide embeded HTTP server, no need to install tomcat separately Spring Boot contains a complete set of Spring implementations such as MVC / REST / AOP / Core,

To record a bit of my rough understanding of polymorphism, inheritance, and encapsulation in Java. Polymorphism * Operate different object / instances under the same interface * Implementation examples * abstract class * Contains at least one abstract method * Leave implementation to inherited classe(s) * No multiple inheritance * Cannot have final declaration * Cannot be instantiated

The purpose of using Wrapper class instead of primitive types are * Primitive types do not use new an object to create variables and have their own values. * Because some Java APIs can only use objects (for example, Collection), not primitive types (ie, int, long, char, boolean, etc.) to handle the

The purpose of streams and lambda is to Tell the computer "what to do" instead of "how to do". Below is the example of looping over the colors traditionally. List<String> allColors = List.of("Red", "Blue", "Yellow"); for

Short Circuit has two operators, && and II, this article is to introduce its difference between the single operator. boolean result = (false && true); // Because the first result is false, right side will not be evaluated. boolean result = (true || false); // result is true // Same as the or operator.

To review some of the features of switch statement in Java, which is part of the Java foundamental concept, I am writing this article. Also I will introduce it's enhanced statement after Java12. The basics of a switch statement consist of the following: * switch: the statement. * case: how