BlockingDeque contains() method in Java with Examples Last Updated : 01 Oct, 2019 Comments Improve Suggest changes Like Article Like Report The contains(Object o) method of BlockingDeque 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: 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 BlockingDeque has been inherited from the LinkedBlockingDeque class in Java. Below programs illustrate contains() method of BlockingDeque: Program 1: Java // Java Program Demonstrate contains() // method of BlockingDeque import java.util.concurrent.LinkedBlockingDeque; import java.util.concurrent.BlockingDeque; import java.util.*; public class GFG { public static void main(String[] args) throws IllegalStateException { // create object of BlockingDeque BlockingDeque<Integer> BD = new LinkedBlockingDeque<Integer>(); // Add numbers to end of BlockingDeque BD.add(10); BD.add(20); BD.add(30); BD.add(40); // before removing print Deque System.out.println("Blocking Deque: " + BD); // check for presence using function if (BD.contains(10)) { System.out.println("Blocking Deque contains 10"); } else { System.out.println("Blocking Deque does not contain 10"); } } } Output: Blocking Deque: [10, 20, 30, 40] Blocking Deque contains 10 Program 2: Java // Java Program Demonstrate contains() // method of BlockingDeque import java.util.concurrent.LinkedBlockingDeque; import java.util.concurrent.BlockingDeque; import java.util.*; public class GFG { public static void main(String[] args) throws IllegalStateException { // create object of BlockingDeque BlockingDeque<String> BD = new LinkedBlockingDeque<String>(); // Add numbers to end of BlockingDeque BD.add("ab"); BD.add("cd"); BD.add("fg"); BD.add("xz"); // before removing print Deque System.out.println("Blocking Deque: " + BD); // check for presence using function if (BD.contains("go")) { System.out.println("Blocking Deque contains 'go'"); } else { System.out.println("Blocking Deque does not contain 'go'"); } } } Output: Blocking Deque: [ab, cd, fg, xz] Blocking Deque does not contain 'go' Reference: https://docs.oracle.com/javase/7/docs/api/java/util/concurrent/LinkedBlockingDeque.html#contains(java.lang.Object) Comment More infoAdvertise with us Next Article BlockingDeque contains() method in Java with Examples G gopaldave Follow Improve Article Tags : Java Java-Collections Java-Functions java-interfaces Practice Tags : JavaJava-Collections Similar Reads BlockingQueue contains() method in Java with examples 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: public boolean contains(Object o) Parameters: This method accepts a man 2 min read ConcurrentLinkedDeque contains() method in Java with Examples The java.util.concurrent.ConcurrentLinkedDeque.contains() method is an inbuilt method in Java which checks if the specified element, passed as a parameter, is present in the deque or not. Syntax: public boolean contains(Object elem) Parameters: The method accepts a parameter elem which checks if the 2 min read Collection contains() method in Java with Examples The contains(Object element) of java.util.Collection interface is used to check whether the element 'element' exists in this collection. This method returns a boolean value depicting the presence of the element. If the element is present, it returns true, else it returns false. Syntax: Collection.co 3 min read BlockingDeque remove() method in Java with Examples The remove() method of BlockingDeque removes the head of the Deque container. The method throws a NoSuchElementException if the Deque container is empty. If an element in passed in the parameter, it removes the given element if present in the Deque. Syntax: public E remove() or boolean remove(elemen 2 min read Charset contains() method in Java with Examples The contains() method is a built-in method of the java.nio.charset checks if a given charset is in another given charset. A charset X contains a charset Y if every character representable in Y is also representable in X. Every charset contains itself. However, this method computes an approximation o 2 min read Like