CODE:

class Subject{
	# name_subject; //科目名(文字列)
	# result;  //点数(整数)
}

class Student # { //Subjectを継承
	# name; //名前(文字列)

	Student(String n, String ns, int r){
             # //初期設定
	}

	# getResult(){ //点数の習得(返り値：整数)
		# //点数を返す
	}
}

class Teacher{
	public static void main(String[] args){
		# //生徒Aを生成
		# //生徒Bを生成
		float mean = # //平均点の計算

		#　//結果を出力
	}
}

CODE:

class Subject{
	String name_subject;
	int result;
}

class Student extends Subject{
	String name;

	Student(String n, String ns, int r){
		name = n;
		name_subject = ns;
		result = r;
	}

	int getResult(){
		return result;
	}
}

class Teacher{
	public static void main(String[] args){
		Student s_a = new Student("A", "English", 50);
		Student s_b = new Student("B", "English", 65);
		float mean = (s_a.getResult() + s_b.getResult()) / 2.0f ;

		System.out.println("Mean of " + s_a.name_subject + " of " + s_a.name + " and " + s_b.name + " is " + mean);
	}
}

CODE:

class Hello{
	public static void main(String[] args){
		System.out.print("Hello World!");
	}
}