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Graduate.java

@@ -0,0 +1,18 @@
+
+public class Graduate extends Student{
+	private String advisor;
+
+	public Graduate(String name, String major, String advisor) {
+		super(name, major);
+		setAdvisor(advisor);
+	}
+	public void setAdvisor(String advisor) {
+		this.advisor = advisor;
+	}
+	public String getAdvisor() {
+		return advisor;
+	}
+	public int tuition() {
+		return 1500*getCredits();
+	}
+}

Registration.java

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+
+public class Registration {
+
+	public static void main(String[] args) {
+		// TODO Auto-generated method stub
+		UnderGraduate u1 = new UnderGraduate("Mary", "MIS");
+		u1.addCredits(21);
+		u1.addCredits(15);
+		u1.setHonor(true);
+		System.out.println(u1.tuition());
+	}
+
+}

Student.java

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+
+public class Student {
+	private String name;
+	private String major;
+	protected int credits = 0;
+
+	public Student(String name, String major) {
+		setName(name);
+		setMajor(major);
+	}
+	public void setName(String name) {
+		this.name = name;
+	}
+	public String getName() {
+		return name;
+	}
+	public void setMajor(String major) {
+		this.major = major;
+	}
+	public String getMajor() {
+		return major;
+	}
+	public int getCredits() {
+		return credits;
+	}
+	public void addCredits(int credits) {
+		this.credits += credits;
+	}
+}

UnderGraduate.java

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+
+public class UnderGraduate extends Student{
+	private boolean honor = false;
+
+	public UnderGraduate(String name, String major) {
+		super(name, major);
+	}
+	public void setHonor(boolean honor) {
+		this.honor = honor;
+	}
+	public int tuition() {
+		return (honor == true)?500*getCredits():1000*getCredits();
+	}
+}