Java 2 exercises

import java.util.*; public class Activity7C { public static void main(String[] args) { StudentList students = new StudentList(); students.add(new Student(8032, "Casper", 2.78)); students.add(new Student(3044, "Sheena", 3.92)); students.add(new Student(6170, "Yolanda", 4.26)); students.add(new Student(1755, "Geordi", 3.58)); students.printByNumber(); System.out.println("\nEnd of processing."); } } class Student { private int number; private String name; private double gpa; public Student(int number, String name, double gpa) { this.number = number; this.name = name; this.gpa = gpa; } public int getNumber() { return number; } public double getGPA() { return gpa; } public boolean nameComesBefore(Student other) { return name.compareToIgnoreCase(other.name) < 0; } public String toString() { return number + " " + name + " (" + gpa + ")"; } } class StudentList { private ArrayList<Student> list; public StudentList() { list = new ArrayList<Student>(); } public void add(Student student) { boolean done = false; int pos; // find the insertion point (this is just a linear search) pos = list.size() - 1; while (pos >= 0 && !done) { if (student.getNumber() > list.get(pos).getNumber()) { done = true; } else { pos--; } } list.add(pos + 1, student); } public void printByNumber() { System.out.println("\nStudents ordered by number:"); printStudents(list); } private void printStudents(ArrayList<Student> list) { System.out.println("\nList of all students:\n"); for (int i = 0; i < list.size(); i++) { System.out.println(i + 1 + ": " + list.get(i)); } } }