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 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 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
