Iterator Pattern - Revision history

AliIybar: /* Iterator Interface */

2019-03-20T14:02:22Z

‎Iterator Interface

AliIybar at 13:59, 20 March 2019

2019-03-20T13:59:18Z

AliIybar at 15:46, 7 February 2019

2019-02-07T15:46:27Z

AliIybar: Created page with "Category:Extreme Programming Category:Design Patterns Category:OOP == Video == [https://www.youtube.com/watch?v=uNTNEfwYXhI https://www.youtube.com/watch?v=uNTNEf..."

2019-02-07T13:16:54Z

Created page with "Category:Extreme Programming Category:Design Patterns Category:OOP == Video == [https://www.youtube.com/watch?v=uNTNEfwYXhI https://www.youtube.com/watch?v=uNTNEf..."

New page

[[Category:Extreme Programming]]
[[Category:Design Patterns]]
[[Category:OOP]]

== Video ==
[https://www.youtube.com/watch?v=uNTNEfwYXhI https://www.youtube.com/watch?v=uNTNEfwYXhI]

== Definition ==
This pattern is used to get a way to access the elements of a collection object in sequential manner without any need to know its underlying representation.

@@ Line 16: / Line 16: @@
     public Object next();
+  }
 === Container Interface ===
   public interface Container {

← Older revision		Revision as of 13:59, 20 March 2019
Line 9:		Line 9:
	This pattern is used to get a way to access the elements of a collection object in sequential manner without any need to know its underlying representation.		This pattern is used to get a way to access the elements of a collection object in sequential manner without any need to know its underlying representation.

−	[[File:Iterator.~~png~~]]	+	[[File:Iterator.jpg]]
		+	== Implementation ==
		+	=== Iterator Interface ===
		+	public interface Iterator {
		+	public boolean hasNext();
		+	public Object next();
		+	}
		+	=== Container Interface ===
		+	public interface Container {
		+	public Iterator getIterator();
		+	}
		+	=== Concrete class implementing the Container interface ===
		+	<pre>
		+	public class NameRepository implements Container {
		+	public String names[] = {"Robert" , "John" ,"Julie" , "Lora"};
		+
		+	@Override
		+	public Iterator getIterator() {
		+	return new NameIterator();
		+	}
		+
		+	private class NameIterator implements Iterator {
		+
		+	int index;
		+
		+	@Override
		+	public boolean hasNext() {
		+
		+	if(index < names.length){
		+	return true;
		+	}
		+	return false;
		+	}
		+
		+	@Override
		+	public Object next() {
		+
		+	if(this.hasNext()){
		+	return names[index++];
		+	}
		+	return null;
		+	}
		+	}
		+	}
		+	</pre>
		+
		+	=== Implementation Detail ===
		+	<pre>
		+	public class IteratorPatternDemo {
		+
		+	public static void main(String[] args) {
		+	NameRepository namesRepository = new NameRepository();
		+
		+	for(Iterator iter = namesRepository.getIterator(); iter.hasNext();){
		+	String name = (String)iter.next();
		+	System.out.println("Name : " + name);
		+	}
		+	}
		+	}
		+	</pre>

← Older revision		Revision as of 15:46, 7 February 2019
Line 8:		Line 8:
	== Definition ==		== Definition ==
	This pattern is used to get a way to access the elements of a collection object in sequential manner without any need to know its underlying representation.		This pattern is used to get a way to access the elements of a collection object in sequential manner without any need to know its underlying representation.
		+
		+	[[File:Iterator.png]]