段階３完了しました。

em-oop/src/BasicCheck2.java

@@ -3,11 +3,15 @@ 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 student1 = new Student(1,"鈴木一郎");
-		student.studentId = 1;
+		Student student2 = new Student(2,"田中花子");
-		student.name = "鈴木一郎";
+		Student student3 = new Student(3,"佐藤次郎");
-		student.printProfile();
+		student1.printProfile();
+		student2.printProfile();
+		student3.printProfile();
+		int total=Student.getStudentCount();
+		System.out.println("現在の生徒数" + total + "人");
 	}
-
+	
 
 }

em-oop/src/Student.java

@@ -5,5 +5,14 @@ public class Student {
 	
 	 void printProfile() {
 		System.out.println("学籍番号;"+this.studentId+" 名前;"+this.name);
-	} 
+	}
+	 static int studentCount = 0;
+	 public Student (int studentId,String name){
+		 this.studentId = studentId;
+		 this.name = name;
+		 studentCount++;
+	 }
+	 static int getStudentCount() {
+		return studentCount;
+	 }
 }