Abstract Student Class

abstract class Student

{ :

public abstract String getGrade();

}

class PassFailStudent extends Student

{ :

public String getGrade()

{

return (average > 70) ? “pass” : “fail”;

}

}

class LetterGradeStudent extends Student

{ :

public String getGrade()

{

if (average > 90) return “A”;

else if (average > 70) return “B”;

else if (average > 40) return “C”;

else return “D”;

}

}

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