10/30 14:05

Question13-Extends/src/main/java/Character.java

@@ -0,0 +1,66 @@
+public class Character {
+	// 保持するデータ（完全非公開）
+	private String name = "キャラクター";
+	private int hp;
+	private int power;
+	private int defense;
+
+	// 生成方法：生成時に体力・力・防御力の初期値を指定できる
+	public Character(int hp, int power, int defense) {
+		this.hp = hp;
+		this.power = power;
+		this.defense = defense;
+	}
+
+	// 名前のアクセサ（ゲッター / セッター）
+	public String getName() {
+		return this.name;
+	}
+
+	public void setName(String name) {
+		this.name = name;
+	}
+
+	// 攻撃する：自身の「力」の値をそのまま返す
+	public int attack() {
+		return this.power;
+	}
+
+	// ダメージを受ける（相手の攻撃値を受け取る）
+	public boolean receiveDamage(int attackerPower) {
+		// 1. ダメージ量 ＝ 受け取った攻撃値 − 自身の防御力（0以下の場合は1とする）
+		int damage = attackerPower - this.defense;
+		if (damage <= 0) {
+			damage = 1;
+		}
+
+		// 2. 自身の体力からダメージ量を引く
+		this.hp -= damage;
+
+		// 3. 体力が0以下になった場合は、体力を0に補正し、「戦闘不能」の状態とする
+		boolean isDown = false;
+		if (this.hp <= 0) {
+			this.hp = 0;
+			isDown = true;
+		}
+
+		// 4. 次の内容をこの順番で出力する
+		System.out.println(this.name + "は" + damage + "のダメージを受けた。");
+		System.out.println(this.name + "の残り体力は" + this.hp + "。");
+		if (isDown) {
+			System.out.println(this.name + "はちからつきた。");
+		}
+		System.out.println("↓");
+
+		// 5. 戦闘不能になったかどうかを真偽値で返す
+		return isDown;
+	}
+
+	// パラメーター表示：指定の形式の複数行の文字列を返す
+	public String showStatus() {
+		return "名　前：" + this.name + "\n" +
+				"体　力：" + this.hp + "\n" +
+				"　力　：" + this.power + "\n" +
+				"耐　久：" + this.defense;
+	}
+}

Question13-Extends/src/main/java/Hero.java

@@ -0,0 +1,5 @@
+class Hero extends Character {
+	public Hero() {
+		super(25, 10, 7);
+	}
+}

Question13-Extends/src/main/java/Q13_3.java

@@ -0,0 +1,11 @@
+public class Q13_3 {
+	public static void main(String[] args) {
+
+		Hero hero = new Hero();
+
+		hero.setName("勇者");
+
+		String status = hero.showStatus();
+		System.out.println(status);
+	}
+}

Question13-Extends/src/main/java/Q13_4.java

@@ -0,0 +1,13 @@
+
+public class Q13_4 {
+	public static void main(String[] args) {
+
+		Slime slime = new Slime();
+
+		slime.setName("スライム");
+
+		String status = slime.showStatus();
+		System.out.println(status);
+	}
+
+}

Question13-Extends/src/main/java/Slime.java

@@ -0,0 +1,5 @@
+class Slime extends Character {
+	public Slime() {
+		super(10, 5, 2);
+	}
+}

Question14-Interface/.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>

Question14-Interface/.project

@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>Question14-Interface</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<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>
+	</natures>
+</projectDescription>

Question14-Interface/.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

Question14-Interface/.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/.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/.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>