Compiling to a specific JRE with Eclipse

Question

I have two questions regarding compiling a project in Eclipse to a specific JRE:

1) Properties window for project > Java Build Path

Answer 1

Compiler Compliance Level is What you have selected language level from the available one to set for your project.

While The Build Path is a used to create Java classpath.

In The build classpath it is a collection of paths visible or availabel to the compiler when building the project.

The Configure Build Path dialog is used to manipulate a file in your project called .classpath.Which is normally hidden.

So what the Compliance level you have selected your project will go for that particular compliance level execution.