Java Utililty Methods List to Int List

List of utility methods to do List to Int List

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Description

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

Method

int[]toIntegerArray(List arrayValues)
to Integer Array 
int length = arrayValues.size();
int[] result = new int[length];
for (int i = 0; i < length; i++) {
    result[i] = (int) arrayValues.get(i);
return result;
int[]toIntegerArray(List values)
Creates an array of type int[] from a list of instances of class Integer. 
int ret[] = new int[values.size()];
for (int i = 0; i < ret.length; i++)
    ret[i] = values.get(i);
return ret;
ListtoIntegerList(final E[] array)
to Integer List 
List<Integer> integerList = null;
if (array != null) {
    integerList = new ArrayList<Integer>(array.length);
    for (E e : array) {
        if (e != null) {
            try {
                integerList.add(Integer.parseInt(e.toString()));
            } catch (NumberFormatException nfe) {
...
ListtoIntegerList(int... array)
to Integer List 
List<Integer> list = new ArrayList<>(array.length);
for (int item : array)
    list.add(item);
return list;
ListtoIntegerList(int[] array)
to Integer List 
List<Integer> list = new ArrayList<Integer>(array.length);
for (int el : array)
    list.add(el);
return list;
ListtoIntegerList(int[] intArray)
Convert the given int array to an integer list 
List<Integer> integerList = new ArrayList<Integer>(intArray.length);
for (int currInt : intArray) {
    integerList.add(currInt);
return integerList;
ListtoIntegerList(List strList, boolean failOnException)
Parse a list of String into a list of Integer. 
List<Integer> intList = new ArrayList<Integer>();
for (String str : strList) {
    try {
        intList.add(Integer.parseInt(str));
    } catch (NumberFormatException nfe) {
        if (failOnException) {
            return null;
        } else {
...
ListtoIntegers(final List longs)
Converts a list of Longs to Integers 
final List<Integer> ints = new ArrayList<>();
for (final Long lng : longs) {
    ints.add(lng.intValue());
return ints;
ListtoIntegers(List values)
to Integers 
if (values == null) {
    return null;
List<Integer> integerValues = new ArrayList<Integer>(values.size());
for (int index = 0; index < values.size(); index++) {
    String value = values.get(index);
    Integer integerValue = toInteger(value);
    integerValues.add(integerValue);
...
ListtoIntList(List list)
to Int List 
List<Integer> result = new ArrayList<Integer>();
for (String str : list) {
    result.add(fromIntString(str));
return result;