"Modern applications use variable references to connect the different parts of the application. In an object-oriented application, these parts (or components) are objects. In Java, we connect objects using classes that refer to each other. Spring's genius was in moving the fulfillment of variable references out of hard-coded Java and into the framework itself. The Spring framework uses settings you provide to wire together the different parts of your application."
"Spring Boot offers the same power and range as the original Spring, but it's streamlined with popular conventions and packages. Both agile and comprehensive, Spring Boot gives you the best of both worlds. Like the Spring Framework, Spring Boot is essentially a dependency Injection engine. Dependency injection is slightly different from inversion of control, but the basic idea is the same."
Spring Boot is a modern, lightweight extension of the Spring Framework that streamlines setup through conventions and packaged dependencies. It centers on dependency injection, moving object wiring out of hard-coded Java into framework-managed configuration. Developers annotate components and the framework injects required dependencies at runtime. Spring Boot further simplifies configuration by providing sensible defaults and out-of-the-box packages for common tasks, reducing boilerplate code. Examples contrast manual instantiation in vanilla Java with annotated components in Spring, where relationships like a Knight and its Weapon become managed and injected by the framework.
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