Deque iterator() method in Java
Last Updated :
20 Jun, 2020
The iterator() method of Deque Interface returns an iterator over the elements in this deque in a proper sequence. The elements will be returned in order from first (head) to last (tail). The returned iterator is a “weakly consistent” iterator.
Syntax:
Iterator iterator()
Parameters: This method does not accepts any parameter.
Returns: This method returns an iterator over the elements in this deque in a proper sequence.
Below programs illustrate iterator() method of Deque:
Program 1: With the help of ArrayDeque.
import java.util.*;
public class GFG {
public static void main(String[] args)
throws IllegalStateException
{
Deque<Integer> DQ
= new ArrayDeque<Integer>();
DQ.add( 7855642 );
DQ.add( 35658786 );
DQ.add( 5278367 );
DQ.add( 74381793 );
Iterator iteratorVals = DQ.iterator();
System.out.println( "The iterator values"
+ " of Deque are:" );
while (iteratorVals.hasNext()) {
System.out.println(iteratorVals.next());
}
}
}
|
Output:
The iterator values of Deque are:
7855642
35658786
5278367
74381793
Program 2: With the help of LinkedList.
import java.util.*;
public class GFG {
public static void main(String[] args)
throws IllegalStateException
{
Deque<Integer> DQ
= new LinkedList<Integer>();
DQ.add( 7855642 );
DQ.add( 35658786 );
DQ.add( 5278367 );
DQ.add( 74381793 );
Iterator iteratorVals = DQ.iterator();
System.out.println( "The iterator values"
+ " of Deque are:" );
while (iteratorVals.hasNext()) {
System.out.println(iteratorVals.next());
}
}
}
|
Output:
The iterator values of Deque are:
7855642
35658786
5278367
74381793
Program 3: With the help of LinkedBlockingDeque.
import java.util.*;
import java.util.concurrent.LinkedBlockingDeque;
public class GFG {
public static void main(String[] args)
throws IllegalStateException
{
Deque<Integer> DQ
= new LinkedBlockingDeque<Integer>();
DQ.add( 7855642 );
DQ.add( 35658786 );
DQ.add( 5278367 );
DQ.add( 74381793 );
Iterator iteratorVals = DQ.iterator();
System.out.println( "The iterator values"
+ " of Deque are:" );
while (iteratorVals.hasNext()) {
System.out.println(iteratorVals.next());
}
}
}
|
Output:
The iterator values of Deque are:
7855642
35658786
5278367
74381793
Program 4: With the help of ConcurrentLinkedDeque.
import java.util.*;
import java.util.concurrent.ConcurrentLinkedDeque;
public class GFG {
public static void main(String[] args)
throws IllegalStateException
{
Deque<Integer> DQ
= new ConcurrentLinkedDeque<Integer>();
DQ.add( 7855642 );
DQ.add( 35658786 );
DQ.add( 5278367 );
DQ.add( 74381793 );
Iterator iteratorVals = DQ.iterator();
System.out.println( "The iterator values"
+ " of Deque are:" );
while (iteratorVals.hasNext()) {
System.out.println(iteratorVals.next());
}
}
}
|
Output:
The iterator values of Deque are:
7855642
35658786
5278367
74381793
Reference: https://docs.oracle.com/javase/8/docs/api/java/util/Deque.html#iterator–
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