Arraylist and for enchanced loop question

[Dinesh Tahiliani]

public class ArrayListExample {
    public static void main(String[] args) {
        // Instantiate a collection.
        ArrayList<Student> students = new ArrayList<Student>();

        // Create a few Student objects.
        Student a = new Student();
        Student b = new Student();
        Student c = new Student();

        // Store references to all three Students in the collection.
        students.add(a);
        students.add(b);
        students.add(c);

        // ... and then iterate through them one by one,
        // printing each student's name.
        for (Student s : students) {
            System.out.println(s.getName());
        }
    }
}

public class Student
{

Student(string s)
{
// constuctor
}

}

Hello Ranchers,

have a doubt in above example.
I am using the for enchanced loop. Not understanding the thing that how come students(in this case is arraylist ) assign to Student(which is the class). Can anyone shed some lights on this please :?:

[Prav sharma]

The arraylist is a just a data structure to hold the Student Objects.
Now can't you iterate through a data structure with a data type which is stored in that?

In your case "A student object"

Or alternatively think like this,

You are having a list of Students

Dinesh Tahiliani wrote:

public class ArrayListExample {
    public static void main(String[] args) {
        // Instantiate a collection.
        ArrayList<Student> students = new ArrayList<Student>();

        // Create a few Student objects.
        Student a = new Student();
        Student b = new Student();
        Student c = new Student();

        // Store references to all three Students in the collection.
        students.add(a);
        students.add(b);
        students.add(c);

        // ... and then iterate through them one by one,
        // printing each student's name.
        for (Student s : students) {
            System.out.println(s.getName());
        }
    }
}

public class Student
{

Student(string s)
{
// constuctor
}

}

Hello Ranchers,

have a doubt in above example.
I am using the for enchanced loop. Not understanding the thing that how come students(in this case is arraylist ) assign to Student(which is the class). Can anyone shed some lights on this please :?:

[Dinesh Tahiliani]

Didn't get you my friend. can you please expalin in simple terms with the example mentioned by me
:?:

[Prav sharma]

Ok.

In your code you have created a Arraylist of Students ( think as collection of students ).

With this statement you are saying that you need a arrylist which you'll be using to store Student objects

Arraylist<student> = new Arraylist <student>();

Now you are adding to it Student objects.

# students.add(a);
# students.add(b);
# students.add(c)

If you want to iterate through it then you have to retrieve the objects.

| Student a | Student b | Student c |

Now think , if you remove something from this list, then what will come out? Of course a Student Object.

Is it clear now?

Dinesh Tahiliani wrote:Didn't get you my friend. can you please expalin in simple terms with the example mentioned by me
:?:

[Punit Singh]

   for (Student s : students) {  
             System.out.println(s.getName());  
         }  

for each loop internally uses Iterator of ArrayList, you can assume something like this:

 Iterator<Student> iter=students.iterator();
	           Student s=null;
	           while(iter.hasNext()){
	        	    s=iter.next();
	        	   System.out.println(s.getName());
	           }