Collections enumeration() method in Java with Examples
The enumeration() method of java.util.Collections class is used to return an enumeration over the specified collection. This provides interoperability with legacy APIs that require an enumeration as input.
Syntax:
public static Enumeration enumeration(Collection c)
Parameters: This method takes the collection c as a parameter for which an enumeration is to be returned.
Return Value: This method returns an enumeration over the specified collection.
Below are the examples to illustrate the enumeration() method
Example 1:
Java
import java.util.*;
public class GFG1 {
public static void main(String[] argv) throws Exception
{
try {
List<String> arrlist = new ArrayList<String>();
arrlist.add( "Ram" );
arrlist.add( "Gopal" );
arrlist.add( "Verma" );
System.out.println( "List: " + arrlist);
Enumeration<String> e = Collections.enumeration(arrlist);
System.out.println( "\nEnumeration over list: " );
while (e.hasMoreElements())
System.out.println( "Value is: " + e.nextElement());
}
catch (IllegalArgumentException e) {
System.out.println( "Exception thrown : " + e);
}
catch (NoSuchElementException e) {
System.out.println( "Exception thrown : " + e);
}
}
}
|
Output:
List: [Ram, Gopal, Verma]
Enumeration over list:
Value is: Ram
Value is: Gopal
Value is: Verma
Example 2:
Java
import java.util.*;
public class GFG1 {
public static void main(String[] argv) throws Exception
{
try {
List<Integer> arrlist = new ArrayList<Integer>();
arrlist.add( 20 );
arrlist.add( 30 );
arrlist.add( 40 );
System.out.println( "List: " + arrlist);
Enumeration<Integer> e = Collections.enumeration(arrlist);
System.out.println( "\nEnumeration over list: " );
while (e.hasMoreElements())
System.out.println( "Value is: " + e.nextElement());
}
catch (IllegalArgumentException e) {
System.out.println( "Exception thrown : " + e);
}
catch (NoSuchElementException e) {
System.out.println( "Exception thrown : " + e);
}
}
}
|
Output:
List: [20, 30, 40]
Enumeration over list:
Value is: 20
Value is: 30
Value is: 40
Last Updated :
08 Jun, 2021
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