3段階目（Studentクラスにコンストラクタとstaticメンバを追加しよう）

em-oop/src/BasicCheck2.java

@@ -3,10 +3,13 @@ public class BasicCheck2 {
 
 	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 = 1;
-		student.name = "鈴木一郎";
-		student.printProfile();
+		Student student1 = new Student(1, "鈴木一郎");
+		Student student2 = new Student(2, "田中花子");
+		Student student3 = new Student(3, "佐藤次郎");
+		student1.printProfile();
+		student2.printProfile();
+		student3.printProfile();
+		System.out.println("現在の生徒数:" + Student.getStudentCount() + "人");
 	}
 
 }

em-oop/src/Student.java

@@ -2,8 +2,19 @@
 public class Student {
 	int studentId;
 	String name;
+	static int studentCount = 0;
 
 	void printProfile() {
 		System.out.println("学籍番号:" + this.studentId + " 名前:" + this.name);
 	}
+
+	public Student(int studentId, String name) {
+		this.studentId = studentId;
+		this.name = name;
+		studentCount++;
+	}
+
+	public static int getStudentCount() {
+		return studentCount;
+	}
 }