Java Utililty Methods List Transform

List of utility methods to do List Transform

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List Transform

Description

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

Method

List stringToList(final String stringToTransform)
string To List

List<String> list = new ArrayList<String>();
String transformingString = stringToTransform;
int index;
if (transformingString.indexOf(",") != -1) {
 while ((index = transformingString.indexOf(",")) != -1) {
 list.add(transformingString.substring(0, index).trim());
 transformingString = transformingString.substring(index + 1);
 list.add(transformingString.trim());
} else if (transformingString.length() != 0) {
 list.add(transformingString.trim());
return list;

int[] transform(final List l)
transform

final int[] array = new int[l.size()];
for (int i = 0; i < l.size(); i++)
 array[i] = l.get(i).intValue();
return array;

List> transform(List> values)
transform

int size = values.get(0).size();
List<List<Double>> newList = new ArrayList<List<Double>>(size);
for (int i = 0; i < size; i++) {
 newList.add(new ArrayList<Double>());
for (List<Double> list : values) {
 int index = 0;
 for (Double float1 : list) {
...

List transformCollectionTOList(Collection collection)
Transform of Collection to List

List<E> collectionList = new ArrayList<E>();
for (E obj : collection) {
 collectionList.add(obj);
return collectionList;

void transformContinuouslyVariablesByThreshold(List> data, int index, int threshold)
transform Continuously Variables By Threshold

for (int i = 1; i < data.size(); i++) {
 List<String> rowData = data.get(i);
 if (Integer.parseInt(rowData.get(index)) <= threshold) {
 rowData.set(index, "<=" + threshold);
 } else {
 rowData.set(index, ">" + threshold);

List transformIntoAList(String... elements)
transform Into A List

ArrayList<String> list = new ArrayList<String>(elements.length);
for (String element : elements) {
 list.add(element.trim());
return list;

void transformNumberedPropertiesToList(Properties props)
transform Numbered Properties To List

String key = null;
String unnumberedKey = null;
List<String> keyList = null;
List<String> removeKeys = new LinkedList<String>();
Iterator keys = props.keySet().iterator();
Map<String, List<String>> keysLists = new HashMap<String, List<String>>();
while (keys.hasNext()) {
 key = (String) keys.next();
...

String transformStringListToString(List fileContentAsList)
transform String List To String

final StringBuilder sb = new StringBuilder();
for (String line : fileContentAsList) {
 sb.append(line);
 sb.append(getSystemLineSeparator());
return sb.toString().trim();

List transformStringToListOfStrings(String line)
transform String To List Of Strings

if (line == null || line.trim().length() == 0)
 return (new ArrayList<String>(0));
String[] tokens = line.trim().split("\\s+");
int tokensLength = tokens.length;
List<String> result = new ArrayList<String>(tokensLength);
for (int index = 0; index < tokensLength; index++) {
 result.add(tokens[index]);
return (result);

double[] transformToDoublePrimitiveArray(List values)
Transform to a primitive double array.

final double[] doubles = new double[values.size()];
int i = 0;
for (final Double d : values) {
 doubles[i] = d.doubleValue();
 i++;
return doubles;