Use the following file:
StudentTester.java
import java.util.Set;
import java.util.Iterator;
import java.util.HashSet;
/**
A program to test hash codes of students.
*/
public class StudentTester
{
public static void main(String[] args)
{
Student s1 = new Student("Carl", "Wong", 1723);
Student s2 = new Student("Joe", "Wong", 1524);
Student s3 = new Student("Joe", "Wong", 1699);
Student s4 = new Student("Carl", "Wong", 1723);
System.out.println(s2.equals(s3));
System.out.println("Expected: false");
System.out.println(s1.equals(s4));
System.out.println("Expected: true");
Set<Student> students = new HashSet<Student>();
students.add(s1);
students.add(s2);
students.add(s3);
students.add(s4);
System.out.println("Size: " + students.size());
System.out.println("Expected: 3");
}
}