Answer 1

BIN IN JAVA :
Bin in Java Development Kit(JDK) stands for Binary which contains all the binary files which are used by JDK during program compilation. Bin contains all tools such as javac, appletviewer, awttool etc.

BEAN (I think you meant that) IN SPRING BOOT :
In Spring, the objects that form the backbone of your application and that are managed by the Spring IoC container are called beans. A bean is an object that is instantiated, assembled, and otherwise managed by a Spring IoC container. Otherwise, a bean is simply one of many objects in your application.