PriorityBlockingQueue clear() method in Java
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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