List - Array Conversion Notes

1) Converting a List of 

(i)private static String[] createStringArrayWithList(List pel) {
Field[] attribute_fields = (Field[]) pel.toArray(new Field[0]);
String string_Array[]=new String[attribute_fields.length];
for (int i=0;i
{
string_Array[i]=attribute_fields[i].toString();
}
return string_Array;
}

(ii) Set langSet = new HashSet();
Object[] langArr = langSet.toArray(); // this returns an object array

(iii) Set langSet = new HashSet();
String[] arr2 = new String[5];
arr2 = langSet.toArray(arr2); // this returns an array of same type as arr2 i.e a String array

2) Converting a List

private static List convertFieldList_to_StringList(List propEventEle) {
List fields = new ArrayList();
for(Field f: propEventEle)
{
fields.add(f.getName());
}
return fields;
}


3) Converting a Array to List

Integer[] numArr = {100, 200, 300, 400, 500};
List numList = Arrays.asList(numArr);

note : any changes in the list numList updates the array numArr also.