完了済

Question14-Interface/.classpath

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+<?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>

Question14-Interface/.gitignore

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+/build/

Question14-Interface/.project

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+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>Question14-Interface</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>

Question14-Interface/.settings/org.eclipse.jdt.core.prefs

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+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

Question14-Interface/.settings/org.eclipse.wst.common.project.facet.core.xml

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

Question14-Interface/src/main/java/Book.java

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+
+public interface Book {
+	
+	String getTitle();
+	String[] getChapters();
+	
+}

Question14-Interface/src/main/java/Car.java

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+
+public interface Car {
+	
+	void Charge(int gasoline);
+	void Run(int velocity);
+	
+}

Question14-Interface/src/main/java/ProgrammingBook.java

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+
+public class ProgrammingBook implements Book {
+	
+	String title;
+	String[] chapters;
+	
+	public ProgrammingBook(String title,String[] chapters) {
+		this.title = title;
+		this.chapters = chapters;
+	}
+	
+	public String getTitle() {
+		return this.title;
+	}
+	
+	public String[] getChapters() {
+		return this.chapters;
+	}
+	
+}

Question14-Interface/src/main/java/Question14_1.java

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+
+public class Question14_1 {
+
+	public static void main(String[] args) {
+		// TODO 自動生成されたメソッド・スタブ
+		
+		String title = "プログラミング基礎入門";
+		String[] chapters = {"式と変数","制御構文","メソッド","オブジェクト指向","継承"};
+		ProgrammingBook pb = new ProgrammingBook(title,chapters);
+		
+		System.out.println(pb.getTitle());
+		for (String s:pb.getChapters()) {
+			System.out.print(s+" ");
+		}
+	}
+
+}

Question14-Interface/src/main/java/Question14_2.java

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+
+public class Question14_2 {
+
+	public static void main(String[] args) {
+		// TODO 自動生成されたメソッド・スタブ
+		
+		SportCar sc = new SportCar();
+		sc.Charge(100);
+		sc.Run(100);
+		sc.Run(301);
+		
+	}
+
+}

Question14-Interface/src/main/java/SportCar.java

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+
+public class SportCar implements Car {
+	
+	public void Charge(int gasoline) {
+		System.out.println("ハイオクを"+gasoline+"リットル補充した");
+	}
+	
+	public void Run(int velocity) {
+		if (velocity>300) {
+			System.out.println("速度オーバーです");
+		} else {
+			System.out.println("スポーツカーは時速"+velocity+"キロで走った");
+		}
+	}
+	
+}

Question15-Polymorphism/.classpath

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+<?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

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+/build/

Question15-Polymorphism/.project

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+<?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

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

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

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+
+public class Car {
+	
+	String name;
+	int velocity;
+	
+	public Car() {
+		
+	}
+	
+	public Car(String name,int velocity) {
+		this.name = name;
+		this.velocity = velocity;
+	}
+	
+	public void run() {
+		System.out.println(this.name+"は時速"+this.velocity+"で走った");
+	}
+	
+}

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

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+
+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 sp = new SportCar();
+		sp.run();
+		Car tr = new Truck();
+		tr.run();
+		
+	}
+
+}

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

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+
+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 sp = new SportCar();
+		Car tr = new Truck();
+		
+		Car[] cars = new Car[2];
+		cars[0] = sp;
+		cars[1] = tr;
+		
+		for (Car c:cars) {
+			c.run();
+		}
+		
+	}
+
+}

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

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+
+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 SportCar();
+		((SportCar)car).run();
+		
+	}
+
+}

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

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+
+public class SportCar extends Car {
+	
+	public SportCar() {
+		super("スポーツカー",100);
+	}
+	
+	@Override
+	public void run() {
+		System.out.println(this.name+"は時速"+(3*this.velocity)+"で走った");
+	}
+	
+}

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

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+
+public class Truck extends Car {
+	
+	public Truck() {
+		super("トラック",30);
+	}
+	
+}