![]() ![]() (i.e., the array has more elements than this set), the element in If this set fits in the specified array with room to spare Specified array and the size of this set. ![]() Otherwise, a new array is allocated with the runtime type of the If the set fits in the specified array, it is returned therein. Runtime type of the returned array is that of the specified array. Returns an array containing all of the elements in this set the ![]() Such exceptions are marked as "optional" in the specification for this The insertion of an ineligible element into the set may throw anĮxception or it may succeed, at the option of the implementation. Operation on an ineligible element whose completion would not result in Or it may simply return false some implementations will exhibit the formerīehavior and some will exhibit the latter. To query the presence of an ineligible element may throw an exception, NullPointerException or ClassCastException. Attempting toĪdd an ineligible element throws an unchecked exception, typically For example, some implementations prohibit null elements,Īnd some have restrictions on the types of their elements. Some set implementations have restrictions on the elements that That it is not permissible for a set to contain itself as an element. Is changed in a manner that affects equals comparisons while the The behavior of a set is not specified if the value of an object Note: Great care must be exercised if mutable objects are used as setĮlements. That all constructors must create a set that contains no duplicate elements The additional stipulation on constructors is, not surprisingly, Not contain any additional stipulations.) (The specifications accompanying theseĭeclarations have been tailored to the Set interface, but they do Declarations for other inherited methods areĪlso included here for convenience. Inherited from the Collection interface, on the contracts of allĬonstructors and on the contracts of the add, equals and The Set interface places additional stipulations, beyond those Its name, this interface models the mathematical set abstraction. More formally, setsĬontain no pair of elements e1 and e2 such thatĮ1.equals(e2), and at most one null element. Here’s an example of an UnsupportedOperationException thrown when an object is attempted to be added to an unmodifiable List: import collection that contains no duplicate elements. Trying to add, remove or set elements using ListIterator.Trying to remove elements using an Iterator. ![]() Using wrappers between collections and primitive types.Other cases where this exception can occur include: Trying to add or remove elements from such a List will throw the UnsupportedOperationException exception. Since this method returns a fixed-size unmodifiable List, the add() or remove() methods are unsupported. One of the most common causes for this exception is using the asList() method of the class. What Causes UnsupportedOperationExceptionĪn UnsupportedOperationException is thrown when a requested operation cannot be performed because it is not supported for that particular class. Since it is an unchecked exception, it does not need to be declared in the throws clause of a method or constructor. The UnsupportedOperationException is a member of the Java Collections Framework. This is one of the common exceptions that occur when working with Java collections such as List, Queue, Set and Map. For example, if an unmodifiable List is attempted to be modified by adding or removing elements, an UnsupportedOperationException is thrown. An UnsupportedOperationException is a runtime exception in Java that occurs when a requested operation is not supported. ![]()
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