Next Level Developer

2 Next Level Developer · Post JAVA | Exception Handling | Introduction Posting as Paritosh Agrawal Update Revert to draft Preview Close ComposeHTML Link Introduction: An Exception is nothing but an exceptional or unexpected event that may occur during the program execution. Examples : Invalid input: ValidationException File does not exist: FileNotFoundException Exceptions are categorised into 3 categories. Checked exceptions Unchecked exceptions Errors Checked exceptions:  occurs at the compile time, also called as compile time exceptions. programmer is supposed to handle these exception. Example:  https://ideone.com/80B30I Unchecked exceptions:  occurs at the time of execution, also called as Runtime exceptions. Runtime Exception includes  bugs, such as logic errors or improper use of an API. Example:  https://ideone.com/ZqWh7X Java Exception Hierarchy :  Was this article helpful? Plea...

What is IOC(Inversion Of Control): Allowing your clients to define and use dependency of your service instead you defining it. Example You are creating a service called TextEditor and you want to use an open source library for spell check.  Client ----> Service ----> Dependency There are two ways you can do this. Define dependency in you service and let client do not worry about that. Create Instance on Dependency and let client decide which dependency to use. Let's understand each way through code snippet along with pros and cons.  1. Define dependency in you service and let client do not worry about that: Service: Service will look like public class TextEditor { private SpellChecker checker; public TextEditor() { this.checker = new SpellChecker(); } } Client: Client will use service like TextEditor textEditor = new TextEditor(); Pros: Your client does not need to worry or know about spell checker. Cons ...