ConcurrentLinkedDeque equals() method in Java with Example

Last Updated : 27 Dec, 2018
The equals() method of java.util.ConcurrentLinkedDeque class is used to compare the specified object with this ConcurrentLinkedDeque for equality. Returns true if and only if the specified object is also a ConcurrentLinkedDeque, both ConcurrentLinkedDeques have the same size, and all corresponding pairs of elements in the two ConcurrentLinkedDeques are equal. (Two elements e1 and e2 are equal if (e1==null ? e2==null : e1.equals(e2)).) In other words, two ConcurrentLinkedDeques are defined to be equal if they contain the same elements in the same order. Syntax: 
public boolean equals(Object o)
Parameters: This method takes the object o as a parameter to be compared for equality with this ConcurrentLinkedDeque. Return Value: This method returns true if the specified object is equal to this ConcurrentLinkedDeque. Below programs illustrate the ConcurrentLinkedDeque.equals() method: Program 1: Java 
// Java Program Demonstrate equals()
// method of ConcurrentLinkedDeque

import java.util.concurrent.ConcurrentLinkedDeque;
import java.util.*;

public class GFG {
    public static void main(String[] args)
        throws IllegalStateException
    {

        // create object of ConcurrentLinkedDeque
        ConcurrentLinkedDeque<Integer> CLD1
            = new ConcurrentLinkedDeque<Integer>();

        // Add numbers to end of ConcurrentLinkedDeque
        CLD1.add(7855642);
        CLD1.add(35658786);
        CLD1.add(5278367);
        CLD1.add(74381793);

        System.out.println("Linked Blocking Deque 1: " + CLD1);

        // create another object of ConcurrentLinkedDeque
        ConcurrentLinkedDeque<String> CLD2
            = new ConcurrentLinkedDeque<String>();

        // Add numbers to end of ConcurrentLinkedDeque
        CLD2.add("1");
        CLD2.add("2");
        CLD2.add("3");
        CLD2.add("4");

        System.out.println("Linked Blocking Deque 2: " + CLD2);

        // using equals() function
        System.out.println("Are both Linked Blocking Deque equal: "
                           + CLD1.equals(CLD2));
    }
}
Output: 
Linked Blocking Deque 1: [7855642, 35658786, 5278367, 74381793]
Linked Blocking Deque 2: [1, 2, 3, 4]
Are both Linked Blocking Deque equal: false
Program 2: Java 
// Java Program Demonstrate equals()
// method of ConcurrentLinkedDeque
// when the list contains characters

import java.util.concurrent.ConcurrentLinkedDeque;
import java.util.*;

public class GFG {
    public static void main(String[] args)
        throws IllegalStateException
    {

        // create object of ConcurrentLinkedDeque
        ConcurrentLinkedDeque<String> CLD1
            = new ConcurrentLinkedDeque<String>();

        // Add numbers to end of ConcurrentLinkedDeque
        CLD1.add("1");
        CLD1.add("2");
        CLD1.add("3");
        CLD1.add("4");

        System.out.println("Linked Blocking Deque 1: " + CLD1);

        // using equals() function
        System.out.println("Is CLD1 equal to CLD1: "
                           + CLD1.equals(CLD1));
    }
}
Output: 
Linked Blocking Deque 1: [1, 2, 3, 4]
Is CLD1 equal to CLD1: true
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