Harri Software Development and Solutions Interview Questions and Answers

Java versions 8, 11, and 17 have introduced various new features and improvements.

• Java 8 introduced lambda expressions, streams, and the new Date and Time API.

• Java 11 introduced local-variable syntax for lambda parameters, HTTP client API, and Flight Recorder.

• Java 17 introduced sealed classes, pattern matching for switch statements, and enhanced foreign function and memory API.

Springboot is a framework that simplifies the development of Java applications by providing pre-configured settings and conventions.

• Springboot is built on top of the Spring framework, providing a more streamlined way to build Spring applications.

• Springboot eliminates the need for XML configuration files and allows for easier setup of dependencies.

• Difference between @Component and @ComponentScan: @Component is used to mark a class as a Spring component, while @ComponentScan is...read more

Dependency Injection is a design pattern where the dependencies of an object are provided externally rather than created within the object itself.

• Types of Dependency Injection: Constructor Based, Setter Based, Field Injection

• Constructor Based: Dependencies are provided through the constructor of the class

• Setter Based: Dependencies are provided through setter methods

• Field Injection: Dependencies are directly assigned to fields of the class

Garbage Collection in Java is the process of automatically reclaiming memory by destroying unused objects.

• Garbage Collection is a process in Java where the JVM automatically reclaims memory by destroying objects that are no longer referenced.

• The process of GC involves marking objects that are still in use, sweeping and deleting objects that are no longer in use, and compacting the memory to reduce fragmentation.

• We can explicitly invoke Garbage Collector in Java using System.g...read more

Constructor or Setter based injection is used in Spring framework to inject dependencies into a bean.

• Constructor injection involves passing dependencies as arguments to the constructor of a class.

• Setter injection involves setting dependencies using setter methods.

• Constructor injection is preferred for mandatory dependencies, while setter injection is used for optional dependencies.

• Example: Constructor injection - public class MyClass { private Dependency dependency; public My...read more