public int compare(Object o1, Object o2) {
   Student s1 = (Student) o1;
   Student s2 = (Student) o2;
   if (s1.getName().compareTo(s2.getName()) < 0) return -1;
   else if (s1.getName().compareTo(s2.getName()) > 0) {
     return 1;
   }
   return 0;
 }
 public int compare(Object o1, Object o2) {
   Student s1 = (Student) o1;
   Student s2 = (Student) o2;
   if (s1.getAge() > s2.getAge()) return 1;
   else if (s1.getAge() == s2.getAge()) {
     return 0;
   }
   return -1;
 }
 public static void main(String[] args) {
   Student zlj = new Student("¶¡ÏþÓî", 21);
   Student dxy = new Student("ÕÔËÄ", 22);
   Student cjc = new Student("ÕÅÈý", 11);
   Student lgc = new Student("ÁõÎä", 19);
   List<Student> studentList = new ArrayList<Student>();
   studentList.add(zlj);
   studentList.add(dxy);
   studentList.add(cjc);
   studentList.add(lgc);
   System.out.println("°´ÕÕÄêýgÅÅÐò£º");
   Collections.sort(studentList, new SortByAge());
   for (Student student : studentList) {
     System.out.println(student.getName() + " / " + student.getAge());
   }
   System.out.println(" ========= ");
   System.out.println("°´ÕÕÐÕÃûÅÅÐò");
   Collections.sort(studentList, new SortByName());
   for (Student student : studentList) {
     System.out.println(student.getName() + " / " + student.getAge());
   }
 }