Java Utililty Methods List First Item

List of utility methods to do List First Item

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Description

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

Method

ObjectgetFirstInstanceOf(List source, String className)
get First Instance Of 
Class targetInstance = Class.forName(className);
if (findInstanceOfClassExists(source, className)) {
    for (Object object : source) {
        if (targetInstance.isInstance(object))
            return targetInstance.cast(object);
return null;
...
StringgetFirstItemOrNull(List items)
get First Item Or Null 
return items == null || items.size() == 0 ? null : items.get(0);
ObjectgetFirstLeaf(List aList)
Returns the first non-list object in the given list hierarchy, recursing if a list is found. 
for (int i = 0, iMax = aList.size(); i < iMax; i++) {
    Object obj = aList.get(i);
    if (obj instanceof List)
        obj = getFirstLeaf((List) obj);
    if (obj != null)
        return obj;
return null;
...
intgetFirstNameIndex(List list)
get First Name Index 
for (int i = 0; i < list.size(); i++) {
    if ((list.get(i).length() > 1) && (!personStopWordSet.contains(list.get(i)))) {
        return i;
return -1;
intgetFirstNonEmptyIndex(final List> list)
get First Non Empty Index 
for (int i = 0; i < list.size(); i++) {
    final Collection<?> o = list.get(i);
    if (o != null && !o.isEmpty()) {
        return i;
return -1;
StringgetFirstObject(List valueList)
Get the String value Stored on the 0 index of specified List. 
try {
    return valueList.get(0).toString();
} catch (Exception e) {
    return null;
StringgetFirstOccurNic(List nics, String line)
get First Occur Nic 
int idx = Integer.MAX_VALUE;
String result = "";
for (String nic : nics) {
    int i = line.indexOf(nic);
    if ((i >= 0) && (i < idx)) {
        idx = i;
        result = nic;
return result;
TgetFirstOrNull(List elements)
get First Or Null 
return elements.isEmpty() ? null : elements.get(0);
TgetFirstOrNull(List list)
Return the first element of list. 
if (list == null || list.isEmpty()) {
    return null;
return list.get(0);
T[]getFirstRowMatch(List list, int columnIndex, T value)
get First Row Match 
for (T[] rows : list) {
    if (rows[columnIndex].equals(value))
        return rows;
return null;