20261030

Question08-Method/src/main/java/Question08_06.java

@@ -1,17 +1,9 @@
 
 public class Question08_06 {
 
-	public static int addArray(int x, int y) {
-		return x,y;
-	}
-}
-}
-
 	public static void main(String[] args) {
 		// TODO 自動生成されたメソッド・スタブ
-		int x = 10;
-		int y = 20;
-		System.out.println();
 
+	}
 
 }

Question12-Encapsulation/src/main/java/Item.java

@@ -1,6 +1,6 @@
 public class Item {
 	
-	private String item = "アイテムA";
+	private String item;
 
 	
 	//	ゲッターセッターの設定
@@ -13,12 +13,8 @@ public class Item {
 	}
 	
 	//コンストラクタの設定
-	public Item(String item) {
+	Item(String item) {
 		this.item = item;
 	}
 	
-	//メソッドの設定
-	public void itembox() {
-		System.out.println(item);
-	}
 }

Question12-Encapsulation/src/main/java/Question12_02.java

@@ -4,10 +4,8 @@ public class Question12_02 {
 	public static void main(String[] args) {
 		// TODO 自動生成されたメソッド・スタブ
 		//インスタンスの生成
-		Item secretitem = new Item();
+		Item secretitem = new Item("アイテムA");
 		
-		secretitem.itembox();
-		secretitem.setItem();
 		System.out.println(secretitem.getItem());
 
 	}

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

@@ -1,12 +1,8 @@
 
 public interface Book {
 	
-	String bookname;
+	//Printメソッドの宣言
+	void Print();
 	
 		
-	//メソッドの定義
-	void bookPrint();
-	
-	String chapter(String chapter1,String chapter2,String chapter3,String chapter4,String chapter5);
-	
 }

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

@@ -0,0 +1,4 @@
+
+public interface Car {
+	void Print();
+}

Question14-Interface/src/main/java/Question14_01.java

@@ -1,9 +1,8 @@
 
 public class Question14_01 {
 	public static void main(String[] args) {
-		Book book = new Book();
+		Book bk = new programmingBook();
-		book.bookname = "プログラミング基礎入門";
 		
-		System.out.println(book.chapter());
+		bk.Print();
 	}
 }

Question14-Interface/src/main/java/Question14_02.java

@@ -0,0 +1,10 @@
+
+public class Question14_02 {
+
+	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();
+		car.Print();
+	}
+
+}

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

@@ -0,0 +1,17 @@
+
+public class Sportscar implements Car{
+	int gasolene = 100;
+	int speed = 301;
+	
+	public void Print() {
+		System.out.println("ハイオクを" + gasolene +"リットル補充した");
+		
+		if(speed >= 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" + speed +"キロで走った");
+		}
+	}
+
+
+}

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

@@ -1,14 +1,12 @@
-
 public class programmingBook implements Book {
 	
-	String bookname;
+	//フィールド
+			String bookname = "プログラミング基礎入門";//本のタイトル
+			String[] chapter = {"式と変数","制御構文","メソッド","オブジェクト指向","継承"};//章立て(配列)
 		
-	public void bookPrint() {
+	//コンストラクタ？？
-		System.out.println("プログラミング基礎入門");
+	public void Print() {
+		System.out.println(bookname);
+		System.out.println(chapter[0] + chapter[1] + chapter[2] + chapter[3] + chapter[4]);
 	}
-	
-	public String chapter(String chapter1,String chapter2,String chapter3,String chapter4,String chapter5) {
-		return chapter1+"/"+ chapter2 +"/"+ chapter3 +"/"+ chapter4 +"/"+ chapter5;
-	}
-
 }

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 +1,28 @@
+<?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>
+		<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 +1,11 @@
+
+public class Car {
+	
+	//データ
+	String carname;
+	int carspeed;
+	
+	public void Car() {
+		System.out.println(carname + "は時速" + carspeed + "で走った");
+	}
+}

Question15-Polymorphism/src/main/java/Question15_01.java

@@ -0,0 +1,13 @@
+
+public class Question15_01 {
+
+	public static void main(String[] args) {
+		// TODO 自動生成されたメソッド・スタブ
+		Car sc = new SportsCar();
+		Car tk = new Truck();
+		
+		sc.Car();
+		tk.Car();
+	}
+
+}

Question15-Polymorphism/src/main/java/Question15_02.java

@@ -0,0 +1,19 @@
+
+public class Question15_02 {
+
+	public static void main(String[] args) {
+		// TODO 自動生成されたメソッド・スタブ
+		Car[] cr = new Car[2];
+		
+		cr[0] = new SportsCar();
+		cr[1] = new Truck();
+		
+		
+		for(Car car1 : cr) {
+			car1.Car();
+		}
+		
+		
+	
+	}
+}

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

@@ -0,0 +1,17 @@
+
+public class SportsCar extends Car{
+	
+	//データ
+	String carname = "スポーツカー";
+	int carspeed = 100;
+	
+	@Override
+	public void Car() {
+		System.out.println(carname + "は時速" + carspeed + "で走った");
+	}
+	
+	public void SportsCar() {
+		System.out.println(carname + "は時速" + (carspeed * 3) + "で走った");
+	}
+}
+

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

@@ -0,0 +1,11 @@
+
+public class Truck extends Car {
+	
+	//データ
+	String carname = "トラック";
+	int carspeed = 30;
+	
+	public void Car() {
+		System.out.println(carname + "は時速" + carspeed + "で走った");
+	}
+}

Question16-Exception/.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>

Question16-Exception/.gitignore

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

Question16-Exception/.project

@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>Question16-Exception</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>

Question16-Exception/.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

Question16-Exception/.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>

Question16-Exception/src/main/java/Question16_01.java

@@ -0,0 +1,20 @@
+
+public class Question16_01 {
+
+	public static void main(String[] args) {
+		// TODO 自動生成されたメソッド・スタブ
+		//整数xとyを渡して、プログラムを呼び出す
+
+		try {
+			int x = 10;
+			int y = 0;
+			int Caluculate;
+			Caluculate = x / y;
+			System.out.println(Caluculate);
+		} catch (ArithmeticException e) {
+			System.out.println("0で割ることはできません");
+		}
+
+	}
+
+}

Question16-Exception/src/main/java/Question16_02.java

@@ -0,0 +1,23 @@
+
+public class Question16_02 {
+
+	public static void main(String[] args) {
+		// TODO 自動生成されたメソッド・スタブ
+		
+		try {
+		String str = "";
+		if(str.isEmpty()) 
+			str = null;
+		} catch(NullPointerException e) {
+			System.out.println("入力が空です");
+		} break;
+		
+		try  {
+			int num = Integer.parseInt(str);
+		     System.out.println(num*2);
+		} catch(NumberFormatException e) {
+			System.out.println("数値に変換できません");
+	
+
+}
+