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/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;
+	}
 }