The contains() method is used to check if a given deque contains an specified element or not.
More formally, returns true if and only if this deque contains at least one element e such that o.equals(e).
Package: java.util
Java Platform: Java SE 8
Syntax:
contains(Object o)
Parameters:
Name Description o object to be checked for containment in this dequeReturn Value:
true if this deque contains the specified element
Return Value Type: boolean
Pictorial Presentation
Example: Java ArrayDeque Class: contains() Method
import java.util.ArrayDeque;
import java.util.Deque;
public class Main {
public static void main(String[] args) {
// ArrayList with Capacity 4
ArrayDeque<String> StudentList = new ArrayDeque<String>(4);
//Added 4 elements
StudentList.add("David");
StudentList.add("Tom");
StudentList.add("Rohit");
StudentList.add("Paul");
System.out.println("Students in the list are : ");
System.out.println(StudentList);
System.out.print("Is list contains the student Tom?");
System.out.println(StudentList.contains("Tom"));
System.out.print("Is list contains the student Sudhir?");
System.out.println(StudentList.contains("Sudhir"));
}
}
Output:
Students in the list are : [David, Tom, Rohit, Paul] Is list contains the student Tom?true Is list contains the student Sudhir?false
Java Code Editor:
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