Java Utililty Methods List to Array

List of utility methods to do List to Array

  1. HOME
  2. Java
  3. L
  4. List to Array

Description

The list of methods to do List to Array are organized into topic(s).

Method

String[][]ListToArray(List> values)
List To Array 
String[][] results = new String[values.size()][2];
int index = 0;
for (List<String> value : values) {
    results[index][0] = value.get(0);
    results[index][1] = value.get(1);
    index++;
return results;
...
String[]listToArray(List list)
list To Array 
String[] a = new String[0];
return (String[]) list.toArray(a);
String[]listToArray(List stringList)
Retrieves a string array containing the contents of the provided list of strings. 
if (stringList == null) {
    return null;
String[] stringArray = new String[stringList.size()];
stringList.toArray(stringArray);
return stringArray;
T[]listToArray(List list)
list To Array 
@SuppressWarnings("unchecked")
T[] array = (T[]) new Object[list.size()];
for (int i = 0; i < list.size(); i++) {
    T f = list.get(i);
    array[i] = (f != null ? f : null); 
return array;
String[]toArray(Collection list)
Converts a collection ( List , Set ...) of objects to a String array. 
if (list == null)
    return new String[0];
String[] out = new String[list.size()];
int i = 0;
Iterator it = list.iterator();
while (it.hasNext())
    out[i++] = it.next().toString();
return out;
...
double[]toArray(Collection list)
Converts a collection ( List , Set ...) of Double objects to a double array. 
return asPrimitiveArray(list.toArray(new Double[list.size()]));
double[]toArray(final List list)
to Array 
final double array[] = new double[list.size()];
for (int i = 0; i < array.length; i++) {
    array[i] = list.get(i).doubleValue();
return array;
int[]toArray(final List list)
to Array 
final int n = list.size();
final int[] array = new int[n];
for (int i = 0; i < n; ++i) {
    array[i] = list.get(i);
return array;
int[]toArray(final List list)
Returns an int array created using Integer list. 
final int[] array = new int[list.size()];
for (int i = 0; i < list.size(); i++) {
    final Integer integer = list.get(i);
    array[i] = integer != null ? integer : 0;
return array;
String[]toArray(List list)
to Array 
return (String[]) list.toArray(new String[list.size()]);