Restore

PastAssignments/Assignment3/Assignment3_2230026071/Question2/.classpath

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<classpath>
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER">
+		<attributes>
+			<attribute name="module" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="src" path="src"/>
+	<classpathentry kind="output" path="bin"/>
+</classpath>

PastAssignments/Assignment3/Assignment3_2230026071/Question2/.project

@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>Question2</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>org.eclipse.jdt.core.javabuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>org.eclipse.jdt.core.javanature</nature>
+	</natures>
+</projectDescription>

PastAssignments/Assignment3/Assignment3_2230026071/Question2/.settings/org.eclipse.core.resources.prefs

@@ -0,0 +1,2 @@
+eclipse.preferences.version=1
+encoding/<project>=UTF-8

PastAssignments/Assignment3/Assignment3_2230026071/Question2/src/DisplayBox.java

@@ -0,0 +1,27 @@
+
+public class DisplayBox {
+	//instance variable
+	private Dragonfly dragonfly;
+	
+	//constructor
+	public DisplayBox(Dragonfly dragonfly) {
+		this.dragonfly = dragonfly;
+	}
+	
+	///methods
+	public Dragonfly getDragonfly() {return this.dragonfly;}
+	
+	//test
+	public static void testDisplayBox() {
+		// In the testDisplayBox method, create a male emperor dragonfly called med1...
+		MaleEmperorDragonfly med1 = new MaleEmperorDragonfly();
+		// then create a display box with this male emperor dragonfly in it.
+		DisplayBox db = new DisplayBox(med1); // Implicit upcast from MaleEmperorDragongly to Dragonfly.
+		// Then get the male emperor dragonfly from the display box...
+		Dragonfly d = db.getDragonfly();
+		// and store it into a local variable called med2 of type MaleEmperorDragongly.
+		MaleEmperorDragonfly med2 = (MaleEmperorDragonfly)d; // Downcast mandatory!
+		// Use the == operator to check that med1 and med2 are the same male emperor dragonfly.
+		System.out.println(med1 == med2);
+	}
+}

PastAssignments/Assignment3/Assignment3_2230026071/Question2/src/Dragonfly.java

@@ -0,0 +1,32 @@
+
+public class Dragonfly extends Insect{
+	//instance variable
+	private double length;
+	private int age;
+	
+	//constructor
+	public Dragonfly(String name, double length, int age) {
+		super(name);
+		this.length = length;
+		this.age = age;
+	}
+	
+	//methods
+	public double getLength() {return this.length;}
+	
+	public int getAge() {return this.age;}
+	
+	//method override
+	@Override
+	public boolean canFly() {return true;}
+	
+	//test
+	public static void testDragonfly() {
+		Dragonfly d = new Dragonfly("Frequent Fly", 20.0, 1);
+		// getName is inherited from Insect.
+		System.out.println(d.getName() == "Frequent Fly");
+		System.out.println(d.getLength() == 20.0);
+		System.out.println(d.canFly() == true);
+	}
+
+}

PastAssignments/Assignment3/Assignment3_2230026071/Question2/src/DragonflyNymph.java

@@ -0,0 +1,24 @@
+
+public class DragonflyNymph extends Dragonfly{
+	//constructor
+	public DragonflyNymph() {
+		super("Baby Dragon", 0.8, 1);
+	}
+	
+	//method override
+	@Override
+	public boolean canFly() {return false;}
+	
+	//test
+	public static void testDragonflyNymph () {
+		DragonflyNymph dn = new DragonflyNymph();
+		// getName is inherited from Insect.
+		System.out.println(dn.getName() == "Baby Dragon");
+		// getLength is inherited from Dragonfly.System.out.println(dn.getLength() == 0.8);
+		// getAge is inherited from Dragonfly.
+		System.out.println(dn.getAge() == 1);
+		// canFly is from DragonflyNymph itself.
+		System.out.println(dn.canFly() == false);
+	}
+
+}

PastAssignments/Assignment3/Assignment3_2230026071/Question2/src/EmperorDragonfly.java

@@ -0,0 +1,36 @@
+
+public class EmperorDragonfly extends Dragonfly{
+	//constructors
+	public EmperorDragonfly(String name, double length, int age) {
+		super(name, length, age);
+	}
+	
+	public EmperorDragonfly(String name) {
+		this(name, 2.0, 3);
+	}
+	
+	//test
+	public static void testEmperorDragonfly() {
+		// Testing the first constructor.
+		EmperorDragonfly ed1 = new EmperorDragonfly ("king fly", 3.0,1);
+		// getName is inherited from Insect.
+		System.out.println(ed1.getName() == "king fly");
+		// getLength is inherited from Dragonfly.
+		System.out.println(ed1.getLength() == 3.0);
+		// getAge is inherited from Dragonfly.
+		System.out.println(ed1.getAge() == 1);
+		// canFly is inherited from Dragonfly.
+		System.out.println(ed1.canFly() == true);
+		// Testing the second constructor.
+		EmperorDragonfly ed2 = new EmperorDragonfly ("green fly");
+		// getName is inherited from Insect.
+		System.out.println(ed2.getName() == "green fly");
+		// getLength is inherited from Dragonfly.
+		System.out.println(ed2.getLength() == 2.0);
+		// getAge is inherited from Dragonfly.
+		System.out.println(ed2.getAge() == 3);
+		// canFly is inherited from Dragonfly.
+		System.out.println(ed2.canFly() == true);
+	}
+
+}

PastAssignments/Assignment3/Assignment3_2230026071/Question2/src/Flee.java

@@ -0,0 +1,19 @@
+
+public class Flee extends Insect{
+	//constructor
+	public Flee() {
+		super("Fleet");
+	}
+	
+	//methods override
+	@Override
+	public boolean canFly() {return false;}
+	
+	//test
+	public static void testFlee() {
+		Flee f = new Flee();
+		// getName is inherited from Insect.
+		System.out.println(f.getName() == "Fleet");
+		System.out.println(f.canFly() == false); // No message printed.
+	}
+}

PastAssignments/Assignment3/Assignment3_2230026071/Question2/src/Insect.java

@@ -0,0 +1,27 @@
+
+public class Insect {
+	//instance variable
+	private String name;
+	
+	//constructor
+	public Insect(String name) {
+		this.name = name;
+	}
+	
+	//methods
+	public String getName() {return this.name;}
+	
+	public boolean canFly() {
+		System.out.println("Cannot fly!"); //message
+		return false;
+	}
+	
+	//test
+	public static void testInsect() {
+		Insect i = new Insect("some name");
+		System.out.println(i.getName() == "some name");
+		System.out.println(i.canFly() == false); 
+		// Message printed too.
+	}
+
+}

PastAssignments/Assignment3/Assignment3_2230026071/Question2/src/MaleEmperorDragonfly.java

@@ -0,0 +1,21 @@
+
+public class MaleEmperorDragonfly extends EmperorDragonfly{
+	//constructor
+	public MaleEmperorDragonfly() {
+		super("Beautiful", 3.5, 4);
+	}
+	
+	//test
+	public static void testMaleEmperorDragonfly () {
+		MaleEmperorDragonfly med = new MaleEmperorDragonfly();
+		// getName is inherited from Insect.
+		System.out.println(med.getName() == "Beautiful");
+		// getLength is inherited from EmperorDragonfly.
+		System.out.println(med.getLength() == 3.5);
+		// getAge is inherited from EmperorDragonfly.
+		System.out.println(med.getAge() == 4);
+		// canFly is inherited from Dragonfly.
+		System.out.println(med.canFly() == true);
+	}
+
+}

PastAssignments/Assignment3/Assignment3_2230026071/Question2/src/Start.java

@@ -0,0 +1,14 @@
+
+public class Start {
+
+	public static void main(String[] args) {
+		Insect.testInsect();
+		Flee.testFlee();
+		Dragonfly.testDragonfly();
+		EmperorDragonfly.testEmperorDragonfly();
+		MaleEmperorDragonfly.testMaleEmperorDragonfly();
+		DragonflyNymph.testDragonflyNymph();
+		DisplayBox.testDisplayBox();
+	}
+
+}