[hardwired]

Code:

Student[] students = new Student[500];
// All elements of this array are null.
for(int j = 0; j < 10; j++)
    System.out.println("students["+j+"] = " + students[j]);
// If the Student class has a no-argument constructor you could
// instantiate them all at once:
for(int j = 0; j < stuNumb; j++)
    students[j] = new Student();
// You could also instantiate a student for each new element as you go:
for (int i = 0; i < stuNumb; i++) {
    String stuName = reader.readLine ("Enter the name of sutden #"+
                                       (i+1) +": ");
    students[i] = new Student();
    // Now we have a non-null array element to work with.
    students[i].setName(stuName);
    int testNumb = reader.readInt ("Enter the number of tests for "+
                                    students[i].getName() +": ");
}