Java Utililty Methods List Single Value

List of utility methods to do List Single Value

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Description

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

Method

Tsingle(List list)
single 
if (list.size() == 1) {
    return list.get(0);
} else if (list.size() == 0) {
    throw new RuntimeException("No results found!");
} else {
    throw new RuntimeException("More results returned than one!");
ListsingleElementList(T element)
single Element List 
List<T> newElementList = new ArrayList<>(1);
newElementList.add(element);
return newElementList;
ArrayListsingleItemAsList(T item)
Puts the single item inside newly created ArrayList and returns this list. 
ArrayList<T> list = new ArrayList<T>();
list.add(item);
return list;
ListsingleQuoatanizeStringList(List entries)
Place single quotes around the individual entries in a List of Strings 
List<String> quotedEntries = new ArrayList<String>(entries == null ? 0 : entries.size());
if (entries != null) {
    for (Iterator<String> iterator = entries.iterator(); iterator.hasNext();) {
        String entry = (String) iterator.next();
        quotedEntries.add("'" + entry + "'");
return quotedEntries;
...
ListsingletonList(final T source)
singleton List 
return Collections.singletonList(source);
ListsingletonList(T element)
Replies a singleton list with the given element, or the empty list if the element is null. 
if (element == null) {
    return Collections.emptyList();
return Collections.singletonList(element);
ListsingletonListIfNotNullOrEmptyListIfNull(T element)
singleton List If Not Null Or Empty List If Null 
if (element == null) {
    return new LinkedList<T>();
} else {
    return list(element);
TsingleValue(Class type, List values)
single Value 
if (null == values || values.size() != 1) {
    throw new IllegalStateException("Expecting a single value");
return type.cast(values.get(0));
TsingleValue(List l)
single Value 
if (l == null || l.isEmpty())
    return null;
else
    return (T) l.get(0);
TsingleValue(List values)
single Value 
return values == null || values.isEmpty() ? null : values.get(0);