Here is a basic example of iterating through an array and adding the items to a value list property.

ClipboardProperty myProp = myStepPage.getProperty("TestList");

ArrayList<String> myArray = new ArrayList<String>();
myArray.add("North");
myArray.add("South");
myArray.add("East");
myArray.add("West");

for(int i = 0; i < myArray.size(); i++)
{
  myProp.add(myArray.get(i));
}