How to iterate through an array list in java

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Java

i have an array list, i want to iterate through the arraylist and assign each element in the arraylist the value "hell". How do i that?

/**
 * 
 * 
 */
package practicebook;

import java.util.*; 

public class arraylist1 {

	public static void main(String[] args) {
	// TODO Auto-generated method stub
		
		
		ArrayList <String> myString = new ArrayList<String>(); 
		
	
		System.out.println(myString.size());
		
		myString.add("Eve");
		myString.add("Anna");
		myString.add("Tonny");
		myString.add("Steve");
		
		
		
		Iterator<String> myStringIterator =  myString.iterator();
		
		
		for(int i=0; i< myString.size() ;++i)
		{
			
			String a = myString.get(i) ; 
			
			myString.get(i) = "hell" ;
		
		}
		
		 
	}
	
}
//end main}
// end class

What I have tried:

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