1. What does the Dictionary class in Java represent? A. A collection of key-value pairs B. A single value data structure C. An array of objects D. A list of strings Show Answer 2. Which method is used to retrieve keys from a Dictionary in Java? A. getKeys() B. keys()...
Learn about the Java Dictionary class, its methods, and how to effectively use it in your applications.
Attributes RegisterAttribute JavaTypeParametersAttribute RemarksThe Dictionary class is the abstract parent of any class, such as Hashtable, which maps keys to values. Every key and every value is an object. In any one Dictionary object, every key is associated with at most one value. Given a...
The Java Dictionary class has now become obsolete and currently all the collection types that store data in the form of key-value pairs implement the Java Map interface. However, the Java Dictionary class variables can still be used to store a reference to the Hashtable classes implementing the...
The Dictionary class has four properties and six methods, as discussed below. Addmethod The Add method adds an item to the Dictionary, and associates that item with a key: MyDictionary.Add Key, Item Select allOpen in new window The item can be anything: any data type, an object (including...
Java Dictionary Example Dictionaryclass is the abstract class which is parent of any class which uses the key and value pair relationship. The classes like HashTable extends this class for their functionality. Every key and every value is an object. In any oneDictionaryobject, every key is ...
abstract int size() Returns the number of entries (distinct keys) in this dictionary. Methods declared in class java.lang.Object clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait Constructor Details Dictionary public Dictionary() Sole constructor. (For in...
JavaSet<T> JNIEnv JniHandleOwnership JNINativeWrapper JValue NamespaceMappingAttribute OutputStreamAdapter OutputStreamInvoker PreserveAttribute RaiseThrowableEventArgs RegisterAttribute RequiresPermissionAttribute ResourceDesignerAttribute ResourceIdManager StringDefAttribute ...
Enumeration enu = DICTIONARY.keys() Java Copy参数: 该方法不接受任何参数。返回值: 该方法返回一个Dictionary的键的枚举值。下面的程序用来说明java.util.Dictionary.keys()方法的工作:程序1 :// Java code to illustrate the keys() method import java.util.*; public class Dictionary_Demo { public static...
An island of Indonesia separated from Borneo by the Java Sea, an arm of the western Pacific Ocean. Center of an early Hindu Javanese civilization, Java was converted to Islam before the arrival of the Europeans (mainly the Dutch) in the late 1500s. Ja·va 2 (jä′və, jăv′ə...