The isEmpty() method of Dictionary Class checks whether this dictionary has any key-value mappings or not. The function returns TRUE only if there is no entry in this dictionary.
Syntax:
public abstract boolean isEmpty()
Return Value: The function returns TRUE if the dictionary is empty and FALSE otherwise.
Exception: The function throws no exception.
Below programs illustrate the use of Dictionary.isEmpty() method:
Program 1:
// Java Program to illustrate // Dictionary.isEmpty() method import java.util.*;
class GFG {
public static void main(String[] args)
{
// Create a new hashtable
Dictionary<Integer, String>
d = new Hashtable<Integer, String>();
// Insert elements in the hashtable
d.put( 1 , "Geeks" );
d.put( 2 , "for" );
d.put( 3 , "Geeks" );
// Print the Dictionary
System.out.println( "\nDictionary: " + d);
// check if this dictionary is empty
// using isEmpty() method
if (d.isEmpty()) {
System.out.println( "Dictionary "
+ "is empty" );
}
else
System.out.println( "Dictionary "
+ "is not empty" );
}
} |
Output:
Dictionary: {3=Geeks, 2=for, 1=Geeks} Dictionary is not empty
Program 2:
// Java Program to illustrate // Dictionary.isEmpty() method import java.util.*;
class GFG {
public static void main(String[] args)
{
// Create a new hashtable
Dictionary<String, String>
d = new Hashtable<String, String>();
// Print the Dictionary
System.out.println( "\nDictionary: " + d);
// check if this dictionary is empty
// using isEmpty() method
if (d.isEmpty()) {
System.out.println( "Dictionary "
+ "is empty" );
}
else
System.out.println( "Dictionary "
+ "is not empty" );
// Insert elements in the hashtable
d.put( "a" , "GFG" );
d.put( "b" , "gfg" );
// Print the Dictionary
System.out.println( "\nDictionary: " + d);
// check if this dictionary is empty
// using isEmpty() method
if (d.isEmpty()) {
System.out.println( "Dictionary "
+ "is empty" );
}
else
System.out.println( "Dictionary "
+ "is not empty" );
// Remove elements in the hashtable
d.remove( "a" );
d.remove( "b" );
// Print the Dictionary
System.out.println( "\nDictionary: " + d);
// check if this dictionary is empty
// using isEmpty() method
if (d.isEmpty()) {
System.out.println( "Dictionary "
+ "is empty" );
}
else
System.out.println( "Dictionary "
+ "is not empty" );
}
} |
Output:
Dictionary: {} Dictionary is empty Dictionary: {b=gfg, a=GFG} Dictionary is not empty Dictionary: {} Dictionary is empty
Reference:https://docs.oracle.com/javase/7/docs/api/java/util/Dictionary.html#isEmpty()
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