ArrayList Iterator behavior has been changed from jdk6 to jdk7.

Create and compile the below 3 class and then run Main.java. 
Using JDK6 it prints the element but JDK7 no element is printed.

// DynamicResult.java
public class DynamicResult {
	public Object next() {
		return Math.random() * ( 1000 - 1 );
	}
}


// DynamicArrayList.java
import java.util.ArrayList;

public class DynamicArrayList extends ArrayList{
	
	private int size;
	private DynamicResult dynValues; 

	public DynamicArrayList(DynamicResult result, int size){
		this.dynValues = result;
		this.size = size;
	}
    
	@Override
	public int size() {
		return super.size() + size;
	}

	@Override
	public Object get(int index) {
		if(index < size){
			return dynValues.next();
		} else {
			return super.get(index - size);
		}
	}
}

// Main.java
import java.util.ArrayList;
import java.util.Iterator;

public class Main {
	public static void main(String [] args){
		System.out.println("This code does not work in JDK7 but works in JDK6");
		System.out.println("Print 1 element as size is 1");
		ArrayList list = new DynamicArrayList(new DynamicResult(), 1);
		
		Iterator iter = list.iterator();
		if(iter !=null && iter.hasNext()){
		    System.out.println(iter.next());
		}
	}
}