public class Student { int studentId; String name; public 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++; } static int studentCount = 0; public static int getStudentCount() { return studentCount; } }