Java Utililty Methods List from Array

List values = null;
if (arrValues != null) {
    values = new ArrayList();
    int size = arrValues.length;
    for (int i = 0; i < size; i++) {
        values.add(arrValues[i] != null ? arrValues[i].toUpperCase() : null);
return values;

if (arr == null || arr.isEmpty()) {
    return "";
StringBuilder buf = new StringBuilder();
arr.stream().forEach((str) -> {
    if (buf.length() > 0) {
        buf.append(", ");
    buf.append(str);
});
return buf.toString();

if (array == null)
    return null;
if (!array.getClass().isArray())
    return null;
Class<?> componentType = array.getClass().getComponentType();
if (componentType == null)
    return null;
if (String.class.isAssignableFrom(componentType)) {
...

return new ArrayList<T>();

return new AbstractList<Boolean>() {
    @Override
    public int size() {
        return array.length;
    @Override
    public Boolean get(int index) {
        return array[index];
...

return asList(array, 0, array.length);

List<Class<?>> classes = new ArrayList<Class<?>>();
for (Class<?> clazz : classesArray) {
    classes.add(clazz);
return classes;

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

List<T> list = new ArrayList<T>();
for (Object o : collection) {
    if (type.isInstance(o)) {
        list.add(type.cast(o));
return list;

return Collections.list(Collections.<K>enumeration(values));