public class StudentDome {
public static void main(String[] args) {
ArrayList<Student> c=new ArrayList<>();
Student s1 = new Student("张三",19);
Student s2 = new Student("李四",20);
c.add(s1);
c.add(s2);
Iterator<Student> sc=c.iterator();
while (sc.hasNext()){
Student i=sc.next();
System.out.println(i.getName()+i.getAge());
}
}
}
与
public class StudentDome {
public static void main(String[] args) {
Collection<Student> c=new ArrayList<>();
Student s1 = new Student("张三",19);
Student s2 = new Student("李四",20);
c.add(s1);
c.add(s2);
Iterator<Student> sc=c.iterator();
while (sc.hasNext()){
Student i=sc.next();
System.out.println(i.getName()+i.getAge());
}
}
}
输出不是完全一样的吗
两者有什么区别吗 用途不一样吗