Java Utililty Methods List IndexOf

List of utility methods to do List IndexOf

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Description

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

Method

intindexOfId(List aList, Object anObj)
Returns index of identical given object in given list. 
for (int i = 0, iMax = size(aList); i < iMax; i++)
    if (anObj == aList.get(i))
        return i;
return -1;
intindexOfIdentical(List list, Object value)
Returns the index in list of the first occurrence identical to value , or -1 if list does not contain value . 
int i = 0;
for (Object element : list) {
    if (element == value) {
        return i;
    ++i;
return -1;
...
intindexOfIdentity(List l, T t)
index Of Identity 
for (int i = 0; i < l.size(); i++) {
    if (l.get(i) == t)
        return i;
return -1;
intindexOfIgnoreCase(List values, String target)
index Of Ignore Case 
for (int i = 0; i < values.size(); i++) {
    if (values.get(i).equalsIgnoreCase(target)) {
        return i;
return -1;
intindexOfInstance(List list, Object object)
Performs a lookup for the exact instance of an object in the list and returns its index, or -1 if not found. 
for (int i = 0; i < list.size(); i++) {
    if (list.get(i) == object) {
        return i;
return -1;
intindexOfInstance(List list, Class type)
Finds the index of the first element in the given list of the given type. 
int k = 0;
for (T t : list) {
    if (type.isInstance(t)) {
        return k;
    k++;
return -1;
...
intindexOfMax(List list)
index Of Max 
return list.indexOf(Collections.max(list));
intindexOfMax(List list)
Finds the first index of a maximal element in a list. 
T min = list.get(0);
int index = 0;
for (int i = 0, n = list.size(); i < n; i++) {
    T value = list.get(i);
    if (value.compareTo(min) > 0) {
        min = value;
        index = i;
return index;
intindexOfMinSize(final List> sets)
index Of Min Size 
if (sets.isEmpty())
    throw new IllegalArgumentException("empty sets");
int res = 0;
for (int i = 1; i < sets.size(); i++) {
    if (sets.get(i).size() < sets.get(res).size())
        res = i;
return res;
...
intindexOfNull(List list)
Returns the index of the first null element within the given List . 
int retval = -1;
if (list != null) {
    retval = list.indexOf(null);
return retval;