BlockingQueue contains() method in Java with examples
Last Updated :
14 Oct, 2019
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The contains(Object o) method of BlockingQueue interface checks if the passed element in the parameter exists in the container or not. It returns true if the element exists in the container else it returns a false value.
Syntax:
Java
Java
public boolean contains(Object o)Parameters: This method accepts a mandatory parameter o whose presence in the container is to be checked in the container. Returns: This method returns true if the element is present, else it returns false. Note: The contains() method of BlockingQueue has been inherited from the Queue class in Java. Below programs illustrate contains() method of BlockingQueue: Program 1:
// Java Program Demonstrate contains()
// method of BlockingQueue
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.BlockingQueue;
import java.util.*;
public class GFG {
public static void main(String[] args)
throws IllegalStateException
{
// create object of BlockingQueue
BlockingQueue<Integer> BQ
= new LinkedBlockingQueue<Integer>();
// Add numbers to end of BlockingQueue
BQ.add(10);
BQ.add(20);
BQ.add(30);
BQ.add(40);
// before removing print queue
System.out.println("Blocking Queue: " + BQ);
// check for presence using function
if (BQ.contains(10)) {
System.out.println("Blocking Queue contains 10");
}
else {
System.out.println("Blocking Queue does not contain 10");
}
}
}
// Java Program Demonstrate contains()// method of BlockingQueueimport java.util.concurrent.LinkedBlockingQueue;import java.util.concurrent.BlockingQueue;import java.util.*;public class GFG { public static void main(String[] args) throws IllegalStateException { // create object of BlockingQueue BlockingQueue<Integer> BQ = new LinkedBlockingQueue<Integer>(); // Add numbers to end of BlockingQueue BQ.add(10); BQ.add(20); BQ.add(30); BQ.add(40); // before removing print queue System.out.println("Blocking Queue: " + BQ); // check for presence using function if (BQ.contains(10)) { System.out.println("Blocking Queue contains 10"); } else { System.out.println("Blocking Queue does not contain 10"); } }}
Output:
Program 2:
Blocking Queue: [10, 20, 30, 40] Blocking Queue contains 10
// Java Program Demonstrate contains()
// method of BlockingQueue
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.BlockingQueue;
import java.util.*;
public class GFG {
public static void main(String[] args)
throws IllegalStateException
{
// create object of BlockingQueue
BlockingQueue<String> BQ
= new LinkedBlockingQueue<String>();
// Add numbers to end of BlockingQueue
BQ.add("ab");
BQ.add("cd");
BQ.add("fg");
BQ.add("xz");
// before removing print queue
System.out.println("Blocking Queue: " + BQ);
// check for presence using function
if (BQ.contains("go")) {
System.out.println("Blocking Queue contains 'go'");
}
else {
System.out.println("Blocking Queue does not contain 'go'");
}
}
}
// Java Program Demonstrate contains()// method of BlockingQueueimport java.util.concurrent.LinkedBlockingQueue;import java.util.concurrent.BlockingQueue;import java.util.*;public class GFG { public static void main(String[] args) throws IllegalStateException { // create object of BlockingQueue BlockingQueue<String> BQ = new LinkedBlockingQueue<String>(); // Add numbers to end of BlockingQueue BQ.add("ab"); BQ.add("cd"); BQ.add("fg"); BQ.add("xz"); // before removing print queue System.out.println("Blocking Queue: " + BQ); // check for presence using function if (BQ.contains("go")) { System.out.println("Blocking Queue contains 'go'"); } else { System.out.println("Blocking Queue does not contain 'go'"); } }}
Output:
Reference: https://docs.oracle.com/javase/7/docs/api/java/util/concurrent/LinkedBlockingQueue.html#contains(java.lang.Object)
Blocking Queue: [ab, cd, fg, xz] Blocking Queue does not contain 'go'
