Java ConcurrentLinkedQueue toArray() Method

The toArray() method of ConcurrentLinkedQueue class returns an array containing all the elements present in the queue in no particular order.

Syntax:

Parameters:

NA
a ? this is the array in which the elements of the queue will be stored.

Type Parameters:

T ? this is the component type of the array to hold the collection.

Specified By:

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

toArray() method in interface Collection<E>.

Override:

The toArray() method of ConcurrentLinkedQueue class is overridden by :

toArray() method in class AbstractCollection<E>.

Return Value:

The toArray() method returns an array that contains all the elements of this queue.

Throws:

The toArray() method throws NullPointerException if the specified array is null.

Example 1

  import java.util.concurrent.ConcurrentLinkedQueue;  public class ConcurrentLinkedQueueToArrayExample1 {      static  int j=1;      public static void main(String[] args) {          ConcurrentLinkedQueue<String> queue = new ConcurrentLinkedQueue();          queue.add(“Reema”);          queue.add(“Rahul”);          queue.add(“Rita”);          queue.add(“Ramesh”);          Object[] a=queue.toArray();          for(int i=0 ;i<a.length;i++){              System.out.println(“Element  “+ j++ +”: “+ a[i]);          }      }  }  

Test it Now

Output:

Element  1: Reema  Element  2: Rahul  Element  3: Rita  Element  4: Ramesh

Example 2

  import java.util.concurrent.ConcurrentLinkedQueue;  public class ConcurrentLinkedQueueToArrayExample2 {      public static void main(String[] args) {          ConcurrentLinkedQueue<Integer> queue = new ConcurrentLinkedQueue();          queue.add(8);          queue.add(5);          queue.add(17);          queue.add(80);          queue.add(2);          Object[] a = queue.toArray();          System.out.print(“Elements : “);          for (int i = 0; i < a.length; i++) {              System.out.print(a[i] + ” “);          }          System.out.println();          System.out.print(“Ascending order : “);          for (int i = 0; i < a.length; i++) {              for (int j = i + 1; j < a.length; j++) {                  Object temp = 0;                 if (a[i] > a[j]) {                      temp = a[i];                      a[i] = a[j];                      a[j] = temp;                 }              }          }          for (int i = 0; i < a.length; i++) {              System.out.print(a[i] + ” “);          }        }  }  

Test it Now

Output:

Error:(22, 25) java: bad operand types for binary operator '>'    first type:  java.lang.Object    second type: java.lang.Object

Operator ‘<‘ cannot be applied to java.lang.Object. If we do so, it will give you an error.

This example is the solution to the above described program.

Example 3

  import java.util.concurrent.ConcurrentLinkedQueue;  public class ConcurrentLinkedQueueToArrayExample3 {      public static void main(String[] args) {          ConcurrentLinkedQueue<Integer> queue = new ConcurrentLinkedQueue();          queue.add(8);          queue.add(5);          queue.add(17);          queue.add(80);          queue.add(2);          Integer[] a = new Integer[5];          Integer[] b = queue.toArray(a);          System.out.print(“Elements : “);          for (int i = 0; i < a.length; i++) {              System.out.print(a[i]+” “);          }          System.out.println();          System.out.print(“Ascending order : “);          for (int i = 0; i < b.length; i++) {              for (int j = i + 1; j < b.length; j++) {                  int temp = 0;                  if (a[i] > a[j]) {                      temp = b[i];                      b[i] = b[j];                      b[j] = temp;                  }              }          }          for (int i = 0; i < b.length; i++) {              System.out.print(b[i] + ” “);          }          System.out.print(“nDecending order : “);          for (int i = 4; i >=0; i–) {              System.out.print(b[i] + ” “);          }      }  }  

Test it Now

Output:

Elements : 8 5 17 80 2   Ascending order : 2 5 8 17 80   Decending order : 80 17 8 5 2

Example 4

  import java.util.concurrent.ConcurrentLinkedQueue;  public class ConcurrentLinkedQueueToArrayExample4 {      public static void main(String[] args) {          ConcurrentLinkedQueue<String> queue = new ConcurrentLinkedQueue();          queue.add(“Reema”);          queue.add(“Rahul”);          queue.add(“Rita”);          queue.add(“Ramesh”);          Object[] a=queue.toArray(null);          for(int i=0 ;i<a.length;i++){              System.out.println(“Element : “+a[i]);          }      }  }  

Test it Now

Output:

Exception in thread "main" java.lang.NullPointerException  at java.util.concurrent.ConcurrentLinkedQueue.toArray(ConcurrentLinkedQueue.java:638)  at com.tutorAspire.ConcurrentLinkedQueueToArrayExample4.main(ConcurrentLinkedQueueToArrayExample4.java:11)

Next TopicJava ConcurrentLinkedQueue

Java ConcurrentLinkedQueue toArray() Method

Java ConcurrentLinkedQueue toArray() Method

Syntax:

Parameters:

Type Parameters:

Specified By:

Override:

Return Value:

Throws:

Example 1

Example 2

Example 3

Example 4

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