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6. Explain what an "interface" is and what is included in creating an interface Give two examples of interfaces that are built-in to the Java language. What keyword is used for another class to use an interface? 7. Explain what is meant by "inheritance" by using your own unique structure diagram of three levels. Use the drawing tools. Provide examples of instance variables and methods. How does it make developing classes easier and the code more reusable? What keyword is used for another class to use an inherited class? What kind of relationship does it require between the super and the sub-class? What keyword is used to refer to variables or methods in a base class