PriorityBlockingQueue contains() method in Java
The contains(Object o) method checks whether PriorityBlockingQueue contains an object o or not. This method returns true, if and only if, this queue contains at least one element e which is equal to object o passed as parameter i.e. e.equals(o). If queue does not contains the Object o, then method returns false.
Syntax:
public boolean contains(Object o)
Parameter: This method takes a mandatory parameter o which is the object to be checked in the PriorityBlockingQueue.
Returns: This method returns true if this queue contains the object passed as parameter. Else it returns false.
Exception: This method does not throw any Exception.
Below program illustrate contains() method of PriorityBlockingQueue:
Example 1:
import java.util.concurrent.PriorityBlockingQueue;
public class GFG {
public static void main(String[] args)
{
int capacityOfQueue = 5 ;
PriorityBlockingQueue<Integer> PrioQueue
= new PriorityBlockingQueue<Integer>(capacityOfQueue);
PrioQueue.add( 4641515 );
PrioQueue.add( 46514561 );
PrioQueue.add( 56156 );
PrioQueue.add( 948964165 );
System.out.println( "PrioQueue: " + PrioQueue);
boolean answer1 = PrioQueue.contains( 56156 );
System.out.println( "PriorityBlockingQueue contains "
+ "number 56156 : "
+ answer1);
boolean answer2 = PrioQueue.contains( 46545 );
System.out.println( "PriorityBlockingQueue contains"
+ " number 46545 : "
+ answer2);
}
}
|
Output:
PrioQueue: [56156, 46514561, 4641515, 948964165]
PriorityBlockingQueue contains number 56156 : true
PriorityBlockingQueue contains number 46545 : false
Example 2: To demonstrate contains() method of PriorityBlockingQueue which contains list of names.
import java.util.concurrent.PriorityBlockingQueue;
public class GFG {
public static void main(String[] args)
{
int capacityOfQueue = 10 ;
PriorityBlockingQueue<String> names
= new PriorityBlockingQueue<String>(capacityOfQueue);
names.add( "Geeks" );
names.add( "forGeeks" );
names.add( "A" );
names.add( "Computer" );
names.add( "Portal" );
System.out.println( "List of Names: " + names);
boolean answer1 = names.contains( "Geeks" );
System.out.println( "Does names contains "
+ "Geeks: "
+ answer1);
boolean answer2 = names.contains( "SandeepJain" );
System.out.println( "Does names contains "
+ "SandeepJain: "
+ answer2);
}
}
|
Output:
List of Names: [A, Computer, Geeks, forGeeks, Portal]
Does names contains Geeks: true
Does names contains SandeepJain: false
Reference:
https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/PriorityBlockingQueue.html#contains-java.lang.Object-
Last Updated :
26 Nov, 2018
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