Java Utililty Methods Collection Check

List of utility methods to do Collection Check

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Description

The list of methods to do Collection Check are organized into topic(s).

Method

booleanisBlank(Collection c)
is Blank 
return c != null && c.isEmpty();
booleanisBlank(Collection collection)
is Blank 
return collection == null || collection.size() == 0;
booleanisBlank(final Collection c)
Check if a collection of a string is blank. 
if (c == null || c.isEmpty()) {
    return false;
for (final String text : c) {
    if (isNotBlank(text)) {
        return false;
return true;
booleanisBlank(final Collection collection)
is Blank 
return (collection == null) || isEmpty(collection);
booleanisBlankAll(Collection... collections)
is Blank All 
for (Collection<?> c : collections) {
    if (!isBlank(c)) {
        return false;
return true;
booleanisC2InC1(Collection c1, Collection c2)
return true if all elements of c2 are in c1 
for (T e1 : c1) {
    boolean e1found = false;
    for (T theirPlayer : c2) {
        if (e1.equals(theirPlayer)) {
            e1found = true;
            break;
    if (!e1found) {
        return false;
return true;
intisClassCollection(Class c)
is Class Collection 
if (Collection.class.isAssignableFrom(c)) {
    return 1;
} else if (Map.class.isAssignableFrom(c)) {
    return 2;
} else {
    return 0;
booleanisClassCollection(Class c)
Check if a current class can be cast to collection. 
return Collection.class.isAssignableFrom(c) || Map.class.isAssignableFrom(c);
booleanisClassCollection(Class type)
is Class Collection 
checkNull(type);
boolean collection = false;
if (Collection.class.isAssignableFrom(type)) {
    collection = true;
return collection;
booleanisCollection(Class c)
Returns true if the specified class is a Collection, otherwise it returns false 
return containsInterface(c, "java.util.Collection") || isSet(c) || isList(c);