1030自主学習

Question15-Polymorphism/.classpath

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<classpath>
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-21"/>
+	<classpathentry kind="src" path="src/main/java"/>
+	<classpathentry kind="output" path="build/classes"/>
+</classpath>

Question15-Polymorphism/.gitignore

@@ -0,0 +1 @@
+/build/

Question15-Polymorphism/.project

@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>Question15-Polymorphism</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>org.eclipse.jdt.core.javabuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+		<buildCommand>
+			<name>org.eclipse.wst.common.project.facet.core.builder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>org.eclipse.wst.common.project.facet.core.nature</nature>
+		<nature>org.eclipse.jdt.core.javanature</nature>
+	</natures>
+</projectDescription>

Question15-Polymorphism/.settings/org.eclipse.jdt.core.prefs

@@ -0,0 +1,9 @@
+eclipse.preferences.version=1
+org.eclipse.jdt.core.compiler.codegen.targetPlatform=21
+org.eclipse.jdt.core.compiler.compliance=21
+org.eclipse.jdt.core.compiler.problem.assertIdentifier=error
+org.eclipse.jdt.core.compiler.problem.enablePreviewFeatures=disabled
+org.eclipse.jdt.core.compiler.problem.enumIdentifier=error
+org.eclipse.jdt.core.compiler.problem.reportPreviewFeatures=warning
+org.eclipse.jdt.core.compiler.release=enabled
+org.eclipse.jdt.core.compiler.source=21

Question15-Polymorphism/.settings/org.eclipse.wst.common.project.facet.core.xml

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<faceted-project>
+  <installed facet="java" version="21"/>
+</faceted-project>

Question15-Polymorphism/src/main/java/Car.java

@@ -0,0 +1,14 @@
+
+public class Car {
+	String name;
+	int speed;
+	
+	public Car(String name, int speed) {
+		this.name = name;
+		this.speed = speed;
+	}
+	
+	public String drive() {
+		return this.name + "は時速" + this.speed + "で走った";
+	}
+}

Question15-Polymorphism/src/main/java/Question15_1.java

@@ -0,0 +1,13 @@
+
+public class Question15_1 {
+
+	public static void main(String[] args) {
+		// TODO 自動生成されたメソッド・スタブ
+		Car car1 = new SportsCar();
+		System.out.println(car1.drive());
+		
+		Car car2 = new Truck();
+		System.out.println(car2.drive());
+	}
+
+}

Question15-Polymorphism/src/main/java/Question15_2.java

@@ -0,0 +1,17 @@
+
+public class Question15_2 {
+
+	public static void main(String[] args) {
+		// TODO 自動生成されたメソッド・スタブ
+		Car car1 = new SportsCar();
+		Car car2 = new Truck();
+		
+		Car[] cars = new Car[2];
+		cars[0] = car1;
+		cars[1] = car2;
+		
+		System.out.println(car1.drive());
+		System.out.println(car2.drive());
+	}
+
+}

Question15-Polymorphism/src/main/java/Question15_3.java

@@ -0,0 +1,10 @@
+
+public class Question15_3 {
+
+	public static void main(String[] args) {
+		// TODO 自動生成されたメソッド・スタブ
+		Car car = new SportsCar();
+		System.out.println(((SportsCar)car).turbodrive());
+	}
+
+}

Question15-Polymorphism/src/main/java/SportsCar.java

@@ -0,0 +1,10 @@
+
+public class SportsCar extends Car{
+	public SportsCar() {
+		super("スポーツカー", 100);
+	}
+	
+	public String turbodrive() {
+		return this.name + "は時速" + (this.speed * 3) + "で走った";
+	}
+}

Question15-Polymorphism/src/main/java/Truck.java

@@ -0,0 +1,8 @@
+
+public class Truck extends Car{
+	public Truck() {
+		super("トラック", 30);
+	}
+	
+	
+}