new interface

Question

I do not really know about new interface.
Is the color mean same program languages?
I want to learn Java. Basic problems had learned. What do I learn next?

Answer 1

An interface is like a class with methods that have a body somewhere else.
ex:
interface myInterface{//contains method with out body
void hello;
}
class myClass implements myInterface{//contains all method body for all methods in myInterface
void hello{
System.out.println("hello");
}
}

Answer 2

If you want to access a non final variable in your class that implements an interface. You should use getters and setters because interfaces only have methods