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| Java's Object Orientation, I/O | CS 161 - Java |
Source: examples/AnyStudent.java
/** encapsulate the characteristics of any one student
** @author: Jonathan Doughty
**/
public abstract class AnyStudent {
private static long nextId = 0;
// Instance variables (fields) that will be associated with each student
private String name;
private long id;
private long tuitionPaid;
private long tuitionOwed;
// A constructor that will create student objects with specified name and id
public AnyStudent( String studentName) {
name = studentName;
id = nextId;
nextId++;
}
// I'm not going to allow other users of the AnyStudent class create
// Students without a name and an id value.
private AnyStudent() {
}
public String toString() {
return name + ":" + id;
}
public void payTuition(int amount) {
tuitionPaid += amount;
tuitionOwed -= amount;
}
public long tuitionOwed() {
return tuitionOwed;
}
}
Source: examples/UnderGradStudent.java
/** encapsulate the characteristics of an UnderGrad student
** @author: Jonathan Doughty
**/
public class UnderGradStudent extends AnyStudent {
private float GPA;
// A constructor that will create student objects with specified name and id
public UnderGradStudent( String studentName) {
super(studentName); // invoke AnyStudent constructor
}
public float getGPA() {
return GPA;
}
public String toString() {
String basic = super.toString();
return basic + " GPA:" + GPA;
}
// Other methods associated with being an undergraduate student ...
}
Source: examples/GradStudent.java
/** encapsulate the characteristics of a Grad student
** @author: Jonathan Doughty
**/
public class GradStudent extends AnyStudent {
private Faculty advisor;
private Course teachingAssistantFor;
// A constructor that will create student objects with specified name and id
public GradStudent( String studentName) {
super(studentName);
}
public void writeThesis() {
// mumble
}
public String toString() {
String basic = super.toString();
return basic + " grad";
}
// Other methods associated with being a grad student ...
}
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jwd |