Java ConcurrentLinkedQueue iterator() Method

The iterator() method of ConcurrentLinkedQueue class returns an iterator over the elements in ConcurrentLinkedQueue in proper sequence.

Syntax

Parameter

NA.

Specified By

The iterator() method of ConcurrentLinkedQueue class is specified by:

iterator() method in interface Collection<E>.
iterator () method in interface Iterable<E>.
iterator () method in interface AbstractCollection<E>

Return Value

The iterator() method returns an iterator over the elements in ConcurrentLinkedQueue.

Example 1

import java.util.Iterator;
import java.util.concurrent.ConcurrentLinkedQueue;
public class ConcurrentLinkedQueueIteratorExample1 {
static int i = 1;
public static void main(String[] args) {
ConcurrentLinkedQueue<String> queue = new ConcurrentLinkedQueue<String>();
queue.add("Ram");
queue.add("Sham");
queue.add("Mira");
queue.add("Rajesh");
        Iterator<String> iterator = queue.iterator();
//Returns an iterator over the elements
while (iterator.hasNext()) {
System.out.println(i++ + "." + iterator.next());
        }
    }
}

Test it Now

Output:

1.Ram
2.Sham
3.Mira
4.Rajesh

Example 2

import java.util.Iterator;
import java.util.concurrent.ConcurrentLinkedQueue;
class Student {
static int i = 1;
public String name;
public String college;
    String rollNo;
    Student(String rollNo, String college, String name) {
this.rollNo= rollNo;
this.name = name;
this.college= college;
    }
public String toString() {
return i++ + ".Roll No. =  " + this.rollNo+ "\n  College =  " + this.college+ "\n  Name = " + this.name + "\n";
    }
}
public class ConcurrentLinkedQueueIteratorExample2 {
static int i=1;
public static void main(String[] args) {
         Student student1 = new Student("15cs1029", "MVN University", "Reema");
         Student student2 = new Student("15cs1010", "MVN University", "Geetanjali");
         Student student3 = new Student("17cs1029", "MR University", "Vineet");
         Student student4 = new Student("15cs1011", "MVN University", "Himanshu");
ConcurrentLinkedQueue<Student> queue = new ConcurrentLinkedQueue<Student>();
queue.add(student1);
queue.add(student2);
queue.add(student3);
queue.add(student4);
        Iterator<Student> iterator = queue.iterator();
//Returns an iterator over the elements
while (iterator.hasNext()) {
System.out.println(i++ + "." + iterator.next());
        }
    }
}

Test it Now

Output:

1.1.Roll No. =  15cs1029
  College =  MVN University
  Name = Reema

2.2.Roll No. =  15cs1010
  College =  MVN University
  Name = Geetanjali

3.3.Roll No. =  17cs1029
  College =  MR University
  Name = Vineet

4.4.Roll No. =  15cs1011
  College =  MVN University
  Name = Himanshu

Example 3

import java.util.Collections;
import java.util.Iterator;
import java.util.concurrent.ConcurrentLinkedQueue;
public class ConcurrentLinkedQueueIteratorExample3 {
public static void main(String[] args) {
        Integer[] val = {0, 1};
ConcurrentLinkedQueue<Integer> queue = new ConcurrentLinkedQueue<Integer>();
queue.add(71018);
queue.add(8000);
queue.add(1178);
queue.add(1190);
//Returns an iterator over the elements
Iterator<Integer> iterator = queue.iterator();
while(iterator.hasNext()){
System.out.println(iterator.next());
val[0] = Collections.max(queue);
val[1] = Collections.min(queue);
        }
System.out.println("Max number = "+ val[0]);
System.out.println("Min number = "+ val[1]);
    }
}

Test it Now

Output:

71018
8000
1178
1190
Max number = 71018
Min number = 1178

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