Sort a list with a specific Comparator

SortWithSpecificComparator.java

	public static void main(String[] args) {

		List<Student> list = new LinkedList<Student>();
		int i = 1 ;
		list.add(new Student(i++,"John","Wayne"));
		list.add(new Student(i++,"Joe","Dalton"));
		list.add(new Student(i++,"Bart","Simpson"));
		list.add(new Student(i++,"Homer","Simpson"));
		list.add(new Student(i++,"Jack","Dalton"));
		
		System.out.println("Sort by first name");
		Collections.sort(list, new Comparator<Student>() {
			public int compare(Student s1, Student s2) {
				String firstName = s1.getFirstName() ;
				if ( firstName != null ) {
					return firstName.compareTo(s2.getFirstName());
				}
				return -1;
			}
		});
		print(list);

		System.out.println("Sort by id");
		Collections.sort(list, new Comparator<Student>() {
			public int compare(Student s1, Student s2) {
				return s1.getId() - s2.getId() ;
			}
		});
		print(list);
		
	}