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CopyOnWriteArrayList hashCode() method in Java

Last Updated : 11 Jul, 2025
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The hashCode() method of CopyOnWriteArrayList returns the hashCode value of the list. Syntax: 
public int hashCode()
Parameters: The function does not accepts any parameter. Return Value: The function returns the hashCode value of the list. Below programs illustrate the above function: Program 1: Java 
// Java Program to illustrate the CopyOnWriteArrayList
// hashCode() method in Java
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.*;

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

        // create object of CopyOnWriteArrayList
        CopyOnWriteArrayList<Integer> ArrLis
            = new CopyOnWriteArrayList<Integer>();

        // Add elements
        ArrLis.add(32);
        ArrLis.add(67);
        ArrLis.add(98);
        ArrLis.add(100);

        // print CopyOnWriteArrayList
        System.out.println("CopyOnWriteArrayList: " 
                                         + ArrLis);

        // hashCode value print
        System.out.println("hashCode value: " 
                          + ArrLis.hashCode());
    }
}
Output: 
CopyOnWriteArrayList: [32, 67, 98, 100]
hashCode value: 1944358
Program 2: Java 
// Java Program to illustrate the CopyOnWriteArrayList
// hashCode() method in Java
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.*;

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

        // create object of CopyOnWriteArrayList
        CopyOnWriteArrayList<String> ArrLis
            = new CopyOnWriteArrayList<String>();

        // Add elements
        ArrLis.add("gopal");
        ArrLis.add("gfg");
        ArrLis.add("jgec");
        ArrLis.add("sudo");

        // print CopyOnWriteArrayList
        System.out.println("CopyOnWriteArrayList: " 
                                            + ArrLis);

        // hashCode value print
        System.out.println("hashCode value: " 
                          + ArrLis.hashCode());
    }
}
Output: 
CopyOnWriteArrayList: [gopal, gfg, jgec, sudo]
hashCode value: -1942417272
Reference: https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/CopyOnWriteArrayList.html#hashCode--

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