Suppose that we have the two classes below. Trace the execution of the main program in the Course class.

public class Student

{

private String name;

private int exam1;

private int exam2;

private char grade;

public Student(String name, int exam1, int exam2)

{

this.name = name;

this.exam1 = exam1;

this.exam2 = exam2;

}

public char findGrade()

{

double avg = getAverage();

if (avg >=90.0)

return 'A';

else if (avg >= 80.0)

return 'B';

else if (avg >= 70.0)

return 'C';

else if (avg >= 40.0)

return 'D';

else

return 'F';

}

public String getName()

{

return this.name;

}

public double getAverage()

{

return (exam1 + exam2)/2.0;

}

public void setExam1(int exam1)

{

this.exam1 = exam1;

}

public void setExam2(int exam2)

{

this.exam2= exam2;

}

}

import java.util.ArrayList;

public class Course

{

public static void main(String[] args)

{

ArrayList students = new ArrayList();

Student donald = new Student("Donald Duck", 75, 90);

Student goofy = new Student ("Goofy", 55, 40);

Student minnie = new Student("Minnie Mouse", 88, 95);

students.add(donald);

students.add(goofy);

students.add(minnie);

Student change = students.get(1);

change.setExam1(80);

}

}

Main stack frame

identifier	address	contents
donald	100
goofy	101
minnie	102
students	103
change	104

Heap

identifier	address	contens
	1000
	1001
	1002
	1003
	1004
	1005
	1006
	1007
	1008
	1009
	1010
	1011
	1012
	1013
	1014
	1015
	1016
	1017
	1018
	1019