Prove domande capitolo 7

src/it/oracle/associate/java8/ElectricCar.java

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+package it.oracle.associate.java8;
+
+class Automobile {
+	private final String drive() {
+		return "Driving vehicle";
+	}
+}
+
+class Car extends Automobile {
+	protected String drive() {
+		return "Driving car";
+	}
+}
+
+public class ElectricCar extends Car {
+	@Override
+	public final String drive() {
+		return "Driving electric car";
+	}
+	
+	public static void main(String[] args) {
+		final Car car = new ElectricCar();
+		System.out.println(car.drive());
+	}
+}

src/it/oracle/associate/java8/test/Ballroom.java

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+package it.oracle.associate.java8.test;
+
+abstract class House {
+	protected abstract Object getSpace();
+}
+
+abstract class Room extends House {
+	abstract Object getSpace(Object list);
+}
+
+abstract public class Ballroom extends House {
+	@Override
+	protected abstract Object getSpace();
+	public static void main(String[] squareFootage) {
+		System.out.println("Let's start the party"); 
+	}
+
+}

src/it/oracle/associate/java8/test/BlueCar.java

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+package it.oracle.associate.java8.test;
+
+abstract class Car {
+	static { System.out.println("1"); }
+	public Car(String name) {
+		super();
+		System.out.println("2");
+	}
+	{ System.out.println("3"); }
+}
+
+public class BlueCar extends Car {
+	{ System.out.println("4"); }
+	public BlueCar() {
+		super("blue");
+		System.out.println("5");
+	}
+	public static void main(String[] gears) {
+		new BlueCar();
+	}
+}

src/it/oracle/associate/java8/test/Encyclopedia.java

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+package it.oracle.associate.java8.test;
+
+abstract class Book {
+	protected static String material = "papyrus";
+	public Book() {}
+	public Book(String material) { this.material = material; }
+}
+
+public class Encyclopedia extends Book {
+	public static String material = "cellulose";
+	public Encyclopedia() {super();}
+	public String getMaterial() { return super.material; }
+	public static void main(String[] pages) {
+		System.out.println(new Encyclopedia().getMaterial());
+	}
+}

src/it/oracle/associate/java8/test/HighSchool.java

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+package it.oracle.associate.java8.test;
+
+import java.io.FileNotFoundException;
+import java.io.IOException;
+
+class School {
+	public int getNumberOfStudentsPerClassroom(String... students) throws IOException {
+		return 3;
+	}
+	
+	public int getNumberOfStudentsPerClassroom() throws IOException {
+		return 9;
+	}
+}
+
+public class HighSchool extends School {
+
+	@Override
+	public int getNumberOfStudentsPerClassroom() throws FileNotFoundException {
+		return 2;
+	}
+	
+	public static void main(String[] args) throws IOException {
+		School school = new HighSchool();
+		System.out.println(school.getNumberOfStudentsPerClassroom());
+	}
+}

src/it/oracle/associate/java8/test/InfiniteMath.java

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+package it.oracle.associate.java8.test;
+
+import java.io.FileNotFoundException;
+
+class Math {
+	public final double secret = 2;
+}
+
+class ComplexMath extends Math {
+	public final double secret = 4;
+	
+	protected void dance() throws FileNotFoundException {
+		return;
+	}
+}
+
+public class InfiniteMath extends ComplexMath {
+	public final double secret = 8;
+	public static void main(String[] args) {
+		Math math = new InfiniteMath();
+		System.out.println(math.secret);
+	}
+	
+	@Override
+	public final void dance() {
+		return;
+	}
+}

src/it/oracle/associate/java8/test/IsoscelesRightTriangle.java

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+package it.oracle.associate.java8.test;
+
+abstract class Triangle {
+	abstract String getDescription();
+}
+
+class RightTriangle extends Triangle {
+	@Override
+	protected String getDescription() { return "rt"; } // g1
+}
+
+public abstract class IsoscelesRightTriangle extends RightTriangle { // g2
+	@Override
+	public String getDescription() {
+		return "irt";
+	}
+	
+	public static void main(String[] args) {
+		//final Triangle shape = new IsoscelesRightTriangle(); // g3
+	}
+}

src/it/oracle/associate/java8/test/Performance.java

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+package it.oracle.associate.java8.test;
+
+interface SpeakDialogue { default int talk() { return 7; } }
+interface SingMonologue { default int talk() { return 5; } }
+
+public class Performance implements SpeakDialogue, SingMonologue {
+	public int talk(String... x) {
+		return x.length;
+	}
+	
+	// obbligato a fare l'override
+	@Override
+	public int talk() {
+		// TODO Auto-generated method stub
+		return SingMonologue.super.talk();
+	}
+
+	public static void main(String[] notes) {
+		System.out.println(new Performance().talk(notes));
+	}
+}

src/it/oracle/associate/java8/test/Robot.java

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+package it.oracle.associate.java8.test;
+
+import java.io.EOFException;
+
+class Machine {
+	public boolean turnOn() throws EOFException { return true; }
+}
+
+public class Robot extends Machine {
+	@Override
+	public boolean turnOn() { return false; }
+	public static void main(String[] doesNotCompute) throws Exception {
+		Machine m = new Robot();
+		System.out.println(m.turnOn());
+	}
+}

src/it/oracle/associate/java8/test/SoccerBall.java

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+package it.oracle.associate.java8.test;
+
+abstract class Ball {
+	protected final int size;
+	public Ball(int size) {
+		this.size = size;
+	}
+}
+
+interface Equipment {}
+
+public class SoccerBall extends Ball implements Equipment {
+	public SoccerBall() {
+		super(5);
+	}
+	public Ball get() { return this; }
+	public static void main(String[] args) {
+		Equipment equipment = (Equipment) (Ball) new SoccerBall().get();
+		System.out.println(((SoccerBall) equipment).size);
+	}
+}

src/it/oracle/associate/java8/test/Sprint.java

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+package it.oracle.associate.java8.test;
+
+interface Run {
+	default void walk() {
+		System.out.println("Walking and running!");
+	}
+}
+
+interface Jog {
+	default void walk() {
+		System.out.println("Walking and jogging!");
+	}
+}
+
+public class Sprint implements Run, Jog {
+	@Override
+	public void walk() {
+		System.out.println("Sprinting!");
+	}
+	
+	public static void main(String[] args) {
+		new Sprint().walk();
+	}
+}

src/it/oracle/associate/java8/test/Square.java

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+package it.oracle.associate.java8.test;
+
+abstract class Parallelogram {
+	private int getEqualSides() { return 0; }
+}
+
+abstract class Rectangle extends Parallelogram {
+	public static int getEqualSides() { return 2; } // x1
+}
+
+public class Square extends Rectangle {
+	//public int getEqualSides() { return 4; } //x2
+	public static void main(String[] args) {
+		final Square myFigure = new Square(); // x3
+		System.out.print(myFigure.getEqualSides());
+	}
+}

src/it/oracle/associate/java8/test/Violin.java

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+package it.oracle.associate.java8.test;
+
+interface MusicCreator { public Number play(); }
+abstract class StringInstrument { public Long play() { return 3L; } }
+public class Violin extends StringInstrument implements MusicCreator {
+	@Override
+	public Long play() {
+		return null;
+	}
+}

src/it/oracle/associate/java8/test/Zoologist.java

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+package it.oracle.associate.java8.test;
+
+class Canine {}
+class Dog extends Canine {}
+class Wolf extends Canine {}
+final class Husky extends Dog {}
+
+public class Zoologist {
+	Canine animal;
+	public final void setAnimal(Dog animal) { this.animal = animal; }
+	public static void main(String[] furryFriends) {
+		new Zoologist().setAnimal(new Dog());
+	}
+}