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private int studentID; Student (){ studentID = 12345; } Student (int sID){ studentID = sID; } protected void display(){ Systemoutprintln("Student ID: " + studentID); } } class GraduateStudent extends Student { GraduateStudent(){ super (5555); } public void display() { superdisplay(); } }
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As mentioned previously in this chapter, you can use multilevel inheritance in your program Multilevel inheritance enables a subclass to inherit members of more than one superclass Programmers use multilevel inheritance to group together simpler objects into more complex objects Some programming languages, such as C++, have various kinds of multiple inheritance However, Java has one kind of multiple inheritance called multilevel inheritance Multilevel inheritance limits a subclass to inherit from one superclass However, that superclass can itself be a subclass of another superclass Let s take a look at an example so you can clearly see this relationship We ll define three classes: the Person class, the Student class, and the GraduateStudent class Notice that each of these classes pass the is a test That is, a graduate student is a student, and a student is a person This means that we can relate together these classes using inheritance Classes that don t pass the is a test shouldn t be related together Multilevel inheritance limits a subclass to inherit from one superclass However, we need the GraduateStudent class to inherit members of both the Student class and the Person class We can work around the limits of multilevel inheritance by first creating an inheritance relationship between the Person class and the
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CHAPTER 8 Inheritance
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Student class That is, the Student class will inherit the Person class The Student class has access to all its own members and access to the public and protected members of the Person class Next, we create an inheritance relationship between the Student class and the GraduateStudent class The GraduateStudent class inherits the public and protected members of the Student class, which includes access to the public and protected members of the Person class, because the Student class has already inherited access to those members by inheriting the Person class This example creates a two-level inheritance The first level consists of the Person class and the Student class The Person class is the superclass, and the Student class is the subclass The second level consists of the Student class and the GraduateStudent class, where the Student class is the superclass and the GraduateStudent class is the subclass You can have any number of levels of inheritance in your program as long as each class passes the is a test However, programmers try to avoid using more than three levels because each level adds a degree of complexity to the program and makes it a little more difficult to maintain and update The following program illustrates the previous example This program defines the Person class, the Student class, and the GraduateStudent class The Person class contains an instance variable called name, a constructor that initializes the instance variable, and a method member that displays the instance variable on the screen The Student class is similar to the Person class, but its instance variable stores a student ID The GraduateStudent class has one member a method member called display() The display() method member calls display() method members of the Person class and the Student class Statements in the m a i n ( ) method declare an instance of the GraduateStudent class and call the display() method member of that class to display the name and student ID of the student Each of these are processed behind the scenes by the corresponding class
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class Demo { public static void main (String args[]) { GraduateStudent gs = new GraduateStudent (); gsdisplay(); } } class Person { private String name; Person(){ name = "Bob Smith"; } protected void displayName(){
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