diff --git a/Question10-InstanceAndClass/.classpath b/Question10-InstanceAndClass/.classpath
new file mode 100644
index 0000000..c771657
--- /dev/null
+++ b/Question10-InstanceAndClass/.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>
diff --git a/Question10-InstanceAndClass/.gitignore b/Question10-InstanceAndClass/.gitignore
new file mode 100644
index 0000000..84c048a
--- /dev/null
+++ b/Question10-InstanceAndClass/.gitignore
@@ -0,0 +1 @@
+/build/
diff --git a/Question10-InstanceAndClass/.project b/Question10-InstanceAndClass/.project
new file mode 100644
index 0000000..781c997
--- /dev/null
+++ b/Question10-InstanceAndClass/.project
@@ -0,0 +1,23 @@
+<?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>
diff --git a/Question10-InstanceAndClass/.settings/org.eclipse.jdt.core.prefs b/Question10-InstanceAndClass/.settings/org.eclipse.jdt.core.prefs
new file mode 100644
index 0000000..23fa13b
--- /dev/null
+++ b/Question10-InstanceAndClass/.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
diff --git a/Question10-InstanceAndClass/.settings/org.eclipse.wst.common.project.facet.core.xml b/Question10-InstanceAndClass/.settings/org.eclipse.wst.common.project.facet.core.xml
new file mode 100644
index 0000000..c1a8d07
--- /dev/null
+++ b/Question10-InstanceAndClass/.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>
diff --git a/Question10-InstanceAndClass/src/main/java/Calculation.java b/Question10-InstanceAndClass/src/main/java/Calculation.java
new file mode 100644
index 0000000..3f183a9
--- /dev/null
+++ b/Question10-InstanceAndClass/src/main/java/Calculation.java
@@ -0,0 +1,10 @@
+
+public class Calculation {
+	
+	int baseNum;
+	
+	public void add(int num) {
+		this.baseNum += num;
+	}
+	
+}
diff --git a/Question10-InstanceAndClass/src/main/java/Car.java b/Question10-InstanceAndClass/src/main/java/Car.java
new file mode 100644
index 0000000..d3f5fd4
--- /dev/null
+++ b/Question10-InstanceAndClass/src/main/java/Car.java
@@ -0,0 +1,19 @@
+
+public class Car {
+	
+	String color;
+	int gasoline;
+	
+	public int run() {
+		
+		this.gasoline--;
+		
+		if (this.gasoline>=0) {
+			return (int)(Math.random()*15+1) ;
+		} else {
+			return -1;
+		}
+		
+	}
+
+}
diff --git a/Question10-InstanceAndClass/src/main/java/Question10_1.java b/Question10-InstanceAndClass/src/main/java/Question10_1.java
new file mode 100644
index 0000000..9d66b93
--- /dev/null
+++ b/Question10-InstanceAndClass/src/main/java/Question10_1.java
@@ -0,0 +1,15 @@
+
+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);
+
+	}
+
+}
diff --git a/Question10-InstanceAndClass/src/main/java/Question10_2.java b/Question10-InstanceAndClass/src/main/java/Question10_2.java
new file mode 100644
index 0000000..6625488
--- /dev/null
+++ b/Question10-InstanceAndClass/src/main/java/Question10_2.java
@@ -0,0 +1,14 @@
+
+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";
+		user.printProfile();
+		
+	}
+
+}
diff --git a/Question10-InstanceAndClass/src/main/java/Question10_3.java b/Question10-InstanceAndClass/src/main/java/Question10_3.java
new file mode 100644
index 0000000..4ef6dea
--- /dev/null
+++ b/Question10-InstanceAndClass/src/main/java/Question10_3.java
@@ -0,0 +1,20 @@
+
+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);
+
+	}
+
+}
diff --git a/Question10-InstanceAndClass/src/main/java/Question10_4.java b/Question10-InstanceAndClass/src/main/java/Question10_4.java
new file mode 100644
index 0000000..719de66
--- /dev/null
+++ b/Question10-InstanceAndClass/src/main/java/Question10_4.java
@@ -0,0 +1,15 @@
+
+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 calculation = new Calculation();
+		calculation.baseNum = 100;
+		calculation.add(100);
+		
+		System.out.println(calculation.baseNum);
+		
+	}
+
+}
diff --git a/Question10-InstanceAndClass/src/main/java/Question10_5.java b/Question10-InstanceAndClass/src/main/java/Question10_5.java
new file mode 100644
index 0000000..e9c5d93
--- /dev/null
+++ b/Question10-InstanceAndClass/src/main/java/Question10_5.java
@@ -0,0 +1,16 @@
+
+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 progress = car.run();
+		System.out.println(car.color+"色の車は"+progress+"進みました");
+		System.out.println(car.gasoline);
+		
+	}
+	
+}
diff --git a/Question10-InstanceAndClass/src/main/java/Question10_6.java b/Question10-InstanceAndClass/src/main/java/Question10_6.java
new file mode 100644
index 0000000..9167b95
--- /dev/null
+++ b/Question10-InstanceAndClass/src/main/java/Question10_6.java
@@ -0,0 +1,28 @@
+
+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;
+		
+		int distance = 300;
+		int nRuns = 0;
+		while (true) {
+			distance -= car.run();
+			nRuns++;
+			if (car.gasoline<0) {
+				System.out.println(car.color+"色の車は、目的地に到達できませんでした。");
+				break;
+			}
+			if (distance<=0) {
+				System.out.println(car.color+"色の車は、目的地にまで"+nRuns+"時間かかりました。残りのガソリンは、"+car.gasoline+"リットルです。");
+				break;
+			}
+		}
+		
+	}
+
+}
diff --git a/Question10-InstanceAndClass/src/main/java/Question10_7.java b/Question10-InstanceAndClass/src/main/java/Question10_7.java
new file mode 100644
index 0000000..ffe0b24
--- /dev/null
+++ b/Question10-InstanceAndClass/src/main/java/Question10_7.java
@@ -0,0 +1,33 @@
+
+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
+		
+		User[] userList = new User[3];
+		
+		User user1 = new User();
+		User user2 = new User();
+		User user3 = new User();
+		
+		user1.id = 1;
+		user1.name = "一郎";
+		user2.id = 2;
+		user2.name = "二郎";
+		user3.id = 3;
+		user3.name = "三郎";
+		
+		userList[0] = user1;
+		userList[1] = user2;
+		userList[2] = user3;
+		
+//		for (int i=0;i<userList.length;i++) {
+//			userList[i].printProfile();
+//		}
+		for (User user:userList) {
+			user.printProfile();
+		}
+		
+	}
+
+}
diff --git a/Question10-InstanceAndClass/src/main/java/Question10_8.java b/Question10-InstanceAndClass/src/main/java/Question10_8.java
new file mode 100644
index 0000000..4146b5c
--- /dev/null
+++ b/Question10-InstanceAndClass/src/main/java/Question10_8.java
@@ -0,0 +1,44 @@
+
+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
+		
+		Car[] carList = new Car[3];
+		
+		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;
+		
+		carList[0] = car1;
+		carList[1] = car2;
+		carList[2] = car3;
+		
+		for (Car car:carList) {
+			int distance = 300;
+			int nRuns = 0;
+			while (true) {
+				distance -= car.run();
+				nRuns++;
+				if (car.gasoline<0) {
+					System.out.println(car.color+"色の車は、目的地に到達できませんでした。");
+					break;
+				}
+				if (distance<=0) {
+					System.out.println(car.color+"色の車は、目的地にまで"+nRuns+"時間かかりました。残りのガソリンは、"+car.gasoline+"リットルです。");
+					break;
+				}
+			}
+		}
+		
+	}
+
+}
diff --git a/Question10-InstanceAndClass/src/main/java/Student.java b/Question10-InstanceAndClass/src/main/java/Student.java
new file mode 100644
index 0000000..6b6d79a
--- /dev/null
+++ b/Question10-InstanceAndClass/src/main/java/Student.java
@@ -0,0 +1,7 @@
+
+public class Student {
+	
+	int studentId;
+	String name, mail, password;
+	
+}
diff --git a/Question10-InstanceAndClass/src/main/java/User.java b/Question10-InstanceAndClass/src/main/java/User.java
new file mode 100644
index 0000000..805286b
--- /dev/null
+++ b/Question10-InstanceAndClass/src/main/java/User.java
@@ -0,0 +1,11 @@
+
+public class User {
+	
+	int id;
+	String name;
+	
+	public void printProfile() {
+		System.out.println("ID"+this.id+":"+this.name);
+	}
+
+}