Cloneable

AI-generated Key Takeaways

• The Cloneable interface enables classes to support cloning, a process of creating a copy of an object.

• Implementing this interface signals that the clone() method can be safely called on objects of that class.

• If a class does not implement Cloneable and clone() is invoked, a CloneNotSupportedException is thrown.

public interface Cloneable

Known Indirect Subclasses ArrayDeque<E>, ArrayList<E>, AttributedCharacterIterator, Attributes, BitSet, BreakIterator, CRLSelector, Calendar, CertPathBuilderResult, CertPathParameters, CertPathValidatorResult, CertSelector, CertStoreParameters, CharacterIterator, ChoiceFormat, and 50 others. ArrayDeque<E> Resizable-array implementation of the Deque interface.  ArrayList<E> Resizable-array implementation of the List interface.  AttributedCharacterIterator An AttributedCharacterIterator allows iteration through both text and related attribute information.  Attributes The Attributes class maps Manifest attribute names to associated string values.  BitSet This class implements a vector of bits that grows as needed.  BreakIterator The BreakIterator class implements methods for finding the location of boundaries in text.  CRLSelector A selector that defines a set of criteria for selecting CRLs.  Calendar The Calendar class is an abstract class that provides methods for converting between a specific instant in time and a set of calendar fields such as YEAR, MONTH, DAY_OF_MONTH, HOUR, and so on, and for manipulating the calendar fields, such as getting the date of the next week.  CertPathBuilderResult A specification of the result of a certification path builder algorithm.  CertPathParameters A specification of certification path algorithm parameters.  CertPathValidatorResult A specification of the result of a certification path validator algorithm.  CertSelector A selector that defines a set of criteria for selecting Certificates.  CertStoreParameters A specification of CertStore parameters.  CharacterIterator This interface defines a protocol for bidirectional iteration over text.  ChoiceFormat A ChoiceFormat allows you to attach a format to a range of numbers.  Collator The Collator class performs locale-sensitive String comparison.  CollectionCertStoreParameters Parameters used as input for the Collection CertStore algorithm.  ConcurrentSkipListMap<K, V> A scalable concurrent ConcurrentNavigableMap implementation.  ConcurrentSkipListSet<E> A scalable concurrent NavigableSet implementation based on a ConcurrentSkipListMap.  CopyOnWriteArrayList<E> A thread-safe variant of ArrayList in which all mutative operations (add, set, and so on) are implemented by making a fresh copy of the underlying array.  Date The class Date represents a specific instant in time, with millisecond precision.  DateFormat DateFormat is an abstract class for date/time formatting subclasses which formats and parses dates or time in a language-independent manner.  DateFormatSymbols DateFormatSymbols is a public class for encapsulating localizable date-time formatting data, such as the names of the months, the names of the days of the week, and the time zone data.  DecimalFormatSymbols This class represents the set of symbols (such as the decimal separator, the grouping separator, and so on) needed by DecimalFormat to format numbers.  EnumMap<K extends Enum<K>, V> A specialized Map implementation for use with enum type keys.  EnumSet<E extends Enum<E>> A specialized Set implementation for use with enum types.  Format Format is an abstract base class for formatting locale-sensitive information such as dates, messages, and numbers.  GregorianCalendar GregorianCalendar is a concrete subclass of Calendar and provides the standard calendar system used by most of the world.  HashMap<K, V> Hash table based implementation of the Map interface.  HashSet<E> This class implements the Set interface, backed by a hash table (actually a HashMap instance).  Hashtable<K, V> This class implements a hash table, which maps keys to values.  HttpCookie An HttpCookie object represents an HTTP cookie, which carries state information between server and user agent.  IdentityHashMap<K, V> This class implements the Map interface with a hash table, using reference-equality in place of object-equality when comparing keys (and values).  JarEntry This class is used to represent a JAR file entry.  LDAPCertStoreParameters Parameters used as input for the LDAP CertStore algorithm.  LinkedHashMap<K, V> Hash table and linked list implementation of the Map interface, with predictable iteration order.  LinkedHashSet<E> Hash table and linked list implementation of the Set interface, with predictable iteration order.  LinkedList<E> Doubly-linked list implementation of the List and Deque interfaces.  Locale A Locale object represents a specific geographical, political, or cultural region.  Mac This class provides the functionality of a "Message Authentication Code" (MAC) algorithm.  Manifest The Manifest class is used to maintain Manifest entry names and their associated Attributes.  MessageFormat MessageFormat provides a means to produce concatenated messages in a language-neutral way.  NumberFormat NumberFormat is the abstract base class for all number formats.  PKIXBuilderParameters Parameters used as input for the PKIX CertPathBuilder algorithm.  PKIXCertPathBuilderResult This class represents the successful result of the PKIX certification path builder algorithm.  PKIXCertPathChecker An abstract class that performs one or more checks on an X509Certificate.  PKIXCertPathValidatorResult This class represents the successful result of the PKIX certification path validation algorithm.  PKIXParameters Parameters used as input for the PKIX CertPathValidator algorithm.  PKIXRevocationChecker A PKIXCertPathChecker for checking the revocation status of certificates with the PKIX algorithm.  Properties The Properties class represents a persistent set of properties.  Provider This class represents a "provider" for the Java Security API, where a provider implements some or all parts of Java Security.  SimpleDateFormat SimpleDateFormat is a concrete class for formatting and parsing dates in a locale-sensitive manner.  SimpleTimeZone SimpleTimeZone is a concrete subclass of TimeZone that represents a time zone for use with a Gregorian calendar.  Stack<E> The Stack class represents a last-in-first-out (LIFO) stack of objects.  StringCharacterIterator StringCharacterIterator implements the CharacterIterator protocol for a String.  Time A thin wrapper around the java.util.Date class that allows the JDBC API to identify this as an SQL TIME value.  TimeZone TimeZone represents a time zone offset, and also figures out daylight savings.  Timestamp A thin wrapper around java.util.Date that allows the JDBC API to identify this as an SQL TIMESTAMP value.  TreeMap<K, V> A Red-Black tree based NavigableMap implementation.  TreeSet<E> A NavigableSet implementation based on a TreeMap.  Vector<E> The Vector class implements a growable array of objects.  X509CRLSelector A CRLSelector that selects X509CRLs that match all specified criteria.  X509CertSelector A CertSelector that selects X509Certificates that match all specified criteria.  XMLGregorianCalendar Representation for W3C XML Schema 1.0 date/time datatypes.  ZipEntry This class is used to represent a ZIP file entry.

This (empty) interface must be implemented by all classes that wish to support cloning. The implementation of clone() in Object checks if the object being cloned implements this interface and throws CloneNotSupportedException if it does not.

See Also

• Object.clone()
• CloneNotSupportedException