Iterator of an ArrayList

[Joey Sanchez]

Where does the error come from?

import java.util.List;
import java.util.ArrayList;
import java.util.Iterator;
class Father {
	public void iAm(){System.out.println("Father");}
}

class Son extends Father {
	public void iAm(){System.out.println("Son");}
}

public class Poly extends Son {
	public void iAm(){System.out.println("Poly");}
	
	public static void main(String[] args){
		Father[] a = {new Father(), new Son(), new Poly()};
		
		for(Father f:a)
			f.iAm();
		
		ArrayList<Father> myL = new ArrayList<Father>();
		myL.add(new Father()); myL.add(new Son()); myL.add(new Poly());

		[color=red]Iterator i = new myL.iterator();[/color] //Poly.java:24: package myL does not exist
                                                       //		Iterator i = new myL.iterator();
                                                       //		                    ^
                                                       //1 error
		while(i.hasNext())
			i.next();
	}
}

[Henry Wong]

Joey Sanchez wrote:Where does the error come from?

import java.util.List;
import java.util.ArrayList;
import java.util.Iterator;
class Father {
	public void iAm(){System.out.println("Father");}
}

class Son extends Father {
	public void iAm(){System.out.println("Son");}
}

public class Poly extends Son {
	public void iAm(){System.out.println("Poly");}
	
	public static void main(String[] args){
		Father[] a = {new Father(), new Son(), new Poly()};
		
		for(Father f:a)
			f.iAm();
		
		ArrayList<Father> myL = new ArrayList<Father>();
		myL.add(new Father()); myL.add(new Son()); myL.add(new Poly());

		[color=red]Iterator i = new myL.iterator();[/color] //Poly.java:24: package myL does not exist
                                                       //		Iterator i = new myL.iterator();
                                                       //		                    ^
                                                       //1 error
		while(i.hasNext())
			i.next();
	}
}

You are trying to instantiate an object of the myL.interator class. Notice the "new" operator.... and it is complaining that it can't find such a class.

Henry

[Zeeshan Sheikh]

Iterator i = new myL.iterator(); //Wrong Statement

Just take new operator out

Iterator i = myL.iterator(); //Right Statement

You are accessing iterator method of ArrayList so there is no need for 'new' operator. Hope this helps.