10/19

Question10-InstanceAndClass/.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>

Question10-InstanceAndClass/.gitignore

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+/build/

Question10-InstanceAndClass/.project

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+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>Question10-InstanceAndClass</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>

Question10-InstanceAndClass/.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

Question10-InstanceAndClass/.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>

Question10-InstanceAndClass/src/main/java/Calculation.java

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+
+public class Calculation {
+    int baseNum;
+
+    void add(int num) {
+        baseNum += num;
+    }
+}

Question10-InstanceAndClass/src/main/java/Car.java

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+import java.util.Random;
+
+public class Car {
+    String color;
+    int gasoline;
+
+    int run() {
+        gasoline--;
+
+        if (gasoline >= 0) {
+            Random random = new Random();
+            return random.nextInt(15) + 1; 
+        } else {
+            return -1;
+        }
+    }
+}

Question10-InstanceAndClass/src/main/java/Question10_1.java

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+
+public class Question10_1 {
+
+	public static void main(String[] args) {
+		// TODO 自動生成されたメソッド・スタブ
+        User user = new User();
+
+        user.id = 1000;
+        user.name = "山田太郎";
+
+        System.out.println(user.id);
+        System.out.println(user.name);
+    }
+}

Question10-InstanceAndClass/src/main/java/Question10_2.java

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+
+public class Question10_2 {
+
+	public static void main(String[] args) {
+		// TODO 自動生成されたメソッド・スタブ
+        User user = new User();
+
+        user.id = 2000;
+        user.name = "佐藤二郎";
+
+        System.out.println(user.id);
+        System.out.println(user.name);
+    }
+}

Question10-InstanceAndClass/src/main/java/Question10_3.java

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+
+public class Question10_3 {
+
+	public static void main(String[] args) {
+		// TODO 自動生成されたメソッド・スタブ
+        Student student = new Student();
+
+        student.studentId = 10;
+        student.name = "田中二郎";
+        student.mail = "test@mail.com";
+        student.password = "pass";
+
+        System.out.println(student.studentId);
+        System.out.println(student.name);
+        System.out.println(student.mail);
+        System.out.println(student.password);
+    }
+}

Question10-InstanceAndClass/src/main/java/Question10_4.java

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+
+public class Question10_4 {
+
+	public static void main(String[] args) {
+		// TODO 自動生成されたメソッド・スタブ
+        Calculation cal = new Calculation();
+
+        cal.baseNum = 100;
+
+        cal.add(100);
+
+        System.out.println(cal.baseNum);
+    }
+}

Question10-InstanceAndClass/src/main/java/Question10_5.java

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+
+public class Question10_5 {
+
+	public static void main(String[] args) {
+		// TODO 自動生成されたメソッド・スタブ
+        Car car = new Car();
+
+        car.color = "赤";
+        car.gasoline = 50;
+
+        int distance = car.run();
+
+        System.out.println(car.color + "色の車は" + distance + "進みました");
+        System.out.println(car.gasoline);
+    }
+}

Question10-InstanceAndClass/src/main/java/Question10_6.java

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+
+public class Question10_6 {
+
+	public static void main(String[] args) {
+		// TODO 自動生成されたメソッド・スタブ
+
+        Car car = new Car();
+
+        car.color = "赤";
+        car.gasoline = 50;
+
+        // 目的地までの距離
+        int destination = 300; 
+        // run回数
+        int time = 0;
+
+        while (destination > 0) {
+            int distance = car.run();
+
+            if (distance == -1) {
+                System.out.println(car.color + "色の車は目的地に到達できませんでした");
+                return;
+            }
+
+            destination -= distance;
+            time++;
+        }
+
+        System.out.println(
+                car.color + "色の車は目的地にまで"
+                + time
+                + "時間かかりました。残りのガソリンは、"
+                + car.gasoline
+                + "リットルです");
+    }
+}

Question10-InstanceAndClass/src/main/java/Question10_7.java

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+
+public class Question10_7 {
+
+	public static void main(String[] args) {
+		// TODO 自動生成されたメソッド・スタブ
+        // 配列作成
+        User[] userList = new User[3];
+
+        // インスタンス
+        User user1 = new User();
+        User user2 = new User();
+        User user3 = new User();
+
+        // user1
+        user1.id = 1;
+        user1.name = "一郎";
+
+        // user2
+        user2.id = 2;
+        user2.name = "二郎";
+
+        // user3
+        user3.id = 3;
+        user3.name = "三郎";
+
+        userList[0] = user1;
+        userList[1] = user2;
+        userList[2] = user3;
+
+        //順番に実行
+        for (int i = 0; i < userList.length; i++) {
+            userList[i].printProfile();
+        }
+    }
+}

Question10-InstanceAndClass/src/main/java/Question10_8.java

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+
+public class Question10_8 {
+
+	public static void main(String[] args) {
+		// TODO 自動生成されたメソッド・スタブ
+        // 車作成
+        Car car1 = new Car();
+        car1.color = "赤";
+        car1.gasoline = 50;
+
+        Car car2 = new Car();
+        car2.color = "青";
+        car2.gasoline = 60;
+
+        Car car3 = new Car();
+        car3.color = "黄";
+        car3.gasoline = 70;
+
+        // 配列
+        Car[] carList = {car1, car2, car3};
+
+        
+        for (Car car : carList) {
+
+            int kyori = 300;
+            int time = 0;
+
+            while (kyori > 0) {
+                int gas = car.run();
+
+                if (gas == -1) {
+                    break;
+                }
+
+                kyori -= gas;
+                time++;
+            }
+
+            if (kyori <= 0) {
+                System.out.println(
+                    car.color + "色の車は、目的地にまで"
+                    + time
+                    + "時間かかりました。残りのガソリンは、"
+                    + car.gasoline
+                    + "リットルです"
+                );
+            } else {
+                System.out.println(
+                    car.color + "色の車は、目的地に到達できませんでした"
+                );
+            }
+        }
+    }
+}
+

Question10-InstanceAndClass/src/main/java/Student.java

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+
+public class Student {
+	int studentId;
+	String name;
+	String mail;
+	String password;
+	
+}

Question10-InstanceAndClass/src/main/java/User.java

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+
+public class User {
+    int id;
+    String name;
+
+    void printProfile() {
+        System.out.println("ID" + id + ":" + name);
+    }
+	
+}