CopyOnWriteArrayList hashCode() method in Java Last Updated : 26 Nov, 2018 Comments Improve Suggest changes Like Article Like Report 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-- Comment More infoAdvertise with us Next Article CopyOnWriteArrayList hashCode() method in Java G gopaldave Follow Improve Article Tags : Misc Java Java-Collections Java - util package Java-Functions Java-CopyOnWriteArrayList +2 More Practice Tags : JavaJava-CollectionsMisc Similar Reads CopyOnWriteArrayList get() method in Java The get(index) method of CopyOnWriteArrayList returns the element at the specified index. Syntax: public E get(int index) Parameters: The function accepts a mandatory parameter index which specifies the index of the element to be returned. Return Value: The function returns the element at the given 2 min read CopyOnWriteArraySet equals() method in Java The equals(Object O) method of CopyOnWriteArraySet compares the specified object with this set for equality. Returns true if the specified object is the same object as this object, or if it is also a Set and the elements returned by an iterator over the specified set are the same as the elements ret 2 min read CopyOnWriteArrayList add() method in Java The add(E e) method of CopyOnWriteArrayList inserts the element passed in the parameter to the end of the List or at a specified index in the list. The function returns true on addition of new element to the list. Syntax: public boolean add(E e) or public void add(int index, E element) Parameters: T 2 min read CopyOnWriteArrayList indexOf() method in Java The indexOf(Object o) method of CopyOnWriteArrayList returns the first occurrence of the element passed in the list. It returns -1 if the element is not present in the list. Syntax: public int indexOf(Object o) Parameters: The function accepts a parameter o whose first occurrence is to be returned. 3 min read CopyOnWriteArrayList size() method in Java The size() method of CopyOnWriteArrayList returns the size of the list. It returns the number of elements in the list. Syntax: public int size() Parameters: The function does not accepts any parameter. Return Value: The function returns the size of the list. Below programs illustrate the above funct 1 min read Like