PriorityBlockingQueue contains() method in Java
Last Updated :
26 Nov, 2018
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:
Java
// Java Program Demonstrate contains(Object o)
// method of PriorityBlockingQueue
import java.util.concurrent.PriorityBlockingQueue;
public class GFG {
public static void main(String[] args)
{
// define capacity of PriorityBlockingQueue
int capacityOfQueue = 5;
// create object of PriorityBlockingQueue
PriorityBlockingQueue<Integer> PrioQueue
= new PriorityBlockingQueue<Integer>(capacityOfQueue);
// Add element to PriorityBlockingQueue
PrioQueue.add(4641515);
PrioQueue.add(46514561);
PrioQueue.add(56156);
PrioQueue.add(948964165);
// print PrioQueue
System.out.println("PrioQueue: " + PrioQueue);
// check whether PriorityBlockingQueue contains 56156
boolean answer1 = PrioQueue.contains(56156);
// print result
System.out.println("PriorityBlockingQueue contains "
+ "number 56156 : "
+ answer1);
// check whether PriorityBlockingQueue contains 46545
boolean answer2 = PrioQueue.contains(46545);
// print result
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.
Java
// Java Program Demonstrate contains(Object o)
// method of PriorityBlockingQueue
import java.util.concurrent.PriorityBlockingQueue;
public class GFG {
public static void main(String[] args)
{
// define capacity of PriorityBlockingQueue
int capacityOfQueue = 10;
// create object of PriorityBlockingQueue
PriorityBlockingQueue<String> names
= new PriorityBlockingQueue<String>(capacityOfQueue);
// Add names
names.add("Geeks");
names.add("forGeeks");
names.add("A");
names.add("Computer");
names.add("Portal");
// print queue details
System.out.println("List of Names: " + names);
// check whether PriorityBlockingQueue contains Geeks
boolean answer1 = names.contains("Geeks");
// print result
System.out.println("Does names contains "
+ "Geeks: "
+ answer1);
// check whether PriorityBlockingQueue contains SandeepJain
boolean answer2 = names.contains("SandeepJain");
// print result
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-