AbstractQueue element() method in Java with examples
Last Updated :
26 Nov, 2018
The element() method of AbstractQueue retrieves, but does not remove, the head of this queue.
Syntax:
public E element()
Parameters: This method does not accept any parameters.
Returns: The method returns the head of the Queue.
Exception: The function throws an NoSuchElementException if the queue is empty.
Below programs illustrate element() method:
Program 1:
import java.util.*;
import java.util.concurrent.LinkedBlockingQueue;
public class GFG1 {
public static void main(String[] argv)
throws Exception
{
AbstractQueue<Integer>
AQ1 = new LinkedBlockingQueue<Integer>();
AQ1.add( 10 );
AQ1.add( 20 );
AQ1.add( 30 );
AQ1.add( 40 );
AQ1.add( 50 );
System.out.println( "AbstractQueue1 contains : " + AQ1);
System.out.println( "head : " + AQ1.element());
}
}
|
Output:
AbstractQueue1 contains : [10, 20, 30, 40, 50]
head : 10
Program 2:
import java.util.*;
import java.util.concurrent.LinkedBlockingQueue;
public class GFG1 {
public static void main(String[] argv)
throws Exception
{
try {
AbstractQueue<Integer>
AQ1 = new LinkedBlockingQueue<Integer>();
System.out.println( "AbstractQueue1 : " + AQ1.element());
}
catch (Exception e) {
System.out.println( "Exception is" + e);
}
}
}
|
Output:
Exception isjava.util.NoSuchElementException
Reference: https://docs.oracle.com/javase/8/docs/api/java/util/AbstractQueue.html#element–
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