java：Set迴圈遍曆的倆種方法使用

package collection;

import java.util.*;

public class NewSet {
 public static void main(String[] args) {
  Set<Student> students = new HashSet<Student>();
  for (int i = 0; i < 6; i++) {
   students.add(new Student("Happy"+i,"male"+i,20+i));
  }
  students.add(new Student("Happy0","male0",20));
  print(students);
  print2(students);
 }
 
 //迴圈遍曆①for
 public static void print(Set<Student> newList){
  System.out.println("總資料："+newList.size());
  /*Student student;
  for (int i = 0; i < newList.size(); i++) {
   student = (Student)newList
   System.out.println(student.toString());
  }*/
 }
 //迴圈遍曆①Iterator
 public static void print2(Set<Student> newList){
  System.out.println("總資料："+newList.size());
  Iterator<Student> iterator = newList.iterator();
  Student student;
  while (iterator.hasNext()){
   student = (Student)iterator.next();
   System.out.println(student.toString());
  }
 }
 
}