Chapter 13

interface Speaker {
	void speak();
	int age = 3;
}

public class Inherit {

	abstract class Dog implements Speaker {
		protected String name;
	}

	class MyDog extends Dog {
		MyDog() { name = "Lassie"; }
		public void speak() {
			System.out.println(
			  "My name is " + name);
			System.out.println(
			  "My age is " + age);
			}
		}

	Inherit() { new MyDog().speak(); }

	public static void main(String[] args) {
		new Inherit();
	}
}

interface Speaker {
	void speak();
}

public class Inherit {

	class Dog implements Speaker {
		public void speak() {
			System.out.println("Woof!");
		}
	}

	class Cat implements Speaker {
		public void speak() {
			System.out.println("Meow!");
		}
	}

	Inherit() {
		Speaker c = new Dog();
		Speaker d = new Cat();
		c.speak();
		d.speak();
	}

	public static void main(String[] args) {
		new Inherit();
	}
}

1. A static method could be declared within InnerClass, but not just within OuterClass
2. A static method could be declared within either InnerClass or within OuterClass
3. A static method could be declared within InnerClass, but only if InnerClass is declared to be public
4. A static method can be declared within InnerClass, but only if OuterClass also is declared to be static

public class OuterClass {
    static class InnerClass {

1. An outer class may include but a single inner class
2. An outer class may include several inner classes
3. An outer class may include several inner classes, but only if they are helper classes
4. An outer class may include several inner classes, but only if they are all either static or all non-static

1. Outer and inner classes have access to each other's public and private members
2. Outer and inner classes only have access to each other's public members
3. Outer and inner classes only have access to each other's members if they are declared public or protected
4. Outer and inner classes do not have access to each other's members

1. include the phrase implements interface_name
2. provide bodies for all the methods in the interface
3. provide abstract declarations for any body that is not implemented
4. cannot inherit from any other class or interface

1. It is legal to nest non-static inner classes within non-static inner classes
2. It is legal to nest static inner classes within non-static inner classes
3. It is legal to nest non-static inner classes within static inner classes
4. It is legal to nest static and non-static inner classes within static and non-static inner classes, with the constraint that all the classes be declared public or use package access