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PriorityBlockingQueue clear() method in Java

  • Last Updated : 26 Nov, 2018

The clear() method of PriorityBlockingQueue removes all the elements from this queue. Therefore this method can be applied when it is required to clear the PriorityBlockingQueue.

Syntax:

public void clear()

Parameter:
This method takes no parameters.

Returns:
This method returns nothing.

Exception:
This method does not throw any Exception.



Below program illustrate removing all the elements from PriorityBlockingQueue using clear() method.

Example 1:




// Java Program to Demonstrate clear() method
// of PriorityBlockingQueue.
  
import java.util.concurrent.PriorityBlockingQueue;
  
public class GFG {
  
    public static void main(String[] args)
    {
        // define capacity of PriorityBlockingQueue
        int capacity = 15;
  
        // create object of PriorityBlockingQueue
        PriorityBlockingQueue<Integer> PrioBlockingQueue
            = new PriorityBlockingQueue<Integer>(capacity);
  
        // add numbers
        PrioBlockingQueue.add(78758575);
        PrioBlockingQueue.add(63447688);
        PrioBlockingQueue.add(56434788);
  
        // print queue after add operation
        System.out.println("After Adding  Numbers:");
        System.out.println("PriorityBlockingQueue:"
                           + PrioBlockingQueue);
  
        // remove all the elements using clear() method
        PrioBlockingQueue.clear();
  
        // print queue after clear operation
        System.out.println("\nAfter clear operation:");
        System.out.println("PriorityBlockingQueue:"
                           + PrioBlockingQueue);
    }
}
Output:
After Adding  Numbers:
PriorityBlockingQueue:[56434788, 78758575, 63447688]

After clear operation:
PriorityBlockingQueue:[]

Example 2: To illustrate clear method on a PriorityBlockingQueue which contains a list of names.




// Java Program to Demonstrate clear() method
// of PriorityBlockingQueue.
  
import java.util.concurrent.PriorityBlockingQueue;
  
public class GFG {
  
    public static void main(String[] args)
    {
        // define capacity of PriorityBlockingQueue
        int capacity = 15;
  
        // create object of PriorityBlockingQueue
        PriorityBlockingQueue<String> PrioBlockingQueue
            = new PriorityBlockingQueue<String>(capacity);
  
        // add some names
        PrioBlockingQueue.add("Tandrima");
        PrioBlockingQueue.add("Argha");
        PrioBlockingQueue.add("Arka");
  
        // print queue after add operation
        System.out.println("List of Names:");
        System.out.println("PriorityBlockingQueue: "
                           + PrioBlockingQueue);
  
        // remove all the elements using clear() method
        PrioBlockingQueue.clear();
  
        // print queue after clear operation
        System.out.println("\nAfter clearing List of names:");
        System.out.println("PriorityBlockingQueue:"
                           + PrioBlockingQueue);
    }
}
Output:
List of Names:
PriorityBlockingQueue: [Argha, Tandrima, Arka]

After clearing List of names:
PriorityBlockingQueue:[]

Reference: https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/PriorityBlockingQueue.html#clear–

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