AtomicReferenceArray compareAndSet() method in Java with Examples Last Updated : 03 Jan, 2020 Summarize Comments Improve Suggest changes Share Like Article Like Report The compareAndSet() method of a AtomicReferenceArray class is used to atomically sets the value of index i of AtomicReferenceArray to newValue, if the current value at index i of AtomicReferenceArray object is equal to the expectedValue.This method will return true if update is successful. Syntax: public final boolean compareAndSet( int i, E expectedValue, E newValue) Parameters: This method accepts: i which is an index of AtomicReferenceArray to perform the operation, expectedValue which is the expected value and newValue which is the new value to set. Return value: This method returns true if successful and false return indicates that the actual value was not equal to the expected value. Below programs illustrate the compareAndSet() method: Program 1: Java // Java program to demonstrate // compareAndSet() method import java.util.concurrent.atomic.*; public class GFG { public static void main(String[] args) { // create an atomic reference object. AtomicReferenceArray<Integer> ref = new AtomicReferenceArray<Integer>(3); // set some value ref.set(0, 1234); ref.set(1, 4322); // apply compareAndSet() boolean op1 = ref.compareAndSet(0, 5434, 8913); boolean op2 = ref.compareAndSet(1, 3236, 6543); // print System.out.println("Operation at index 0: " + op1); System.out.println("Operation at index 0: " + op2); } } Output: Operation at index 0: false Operation at index 0: false Program 2: Java // Java program to demonstrate // compareAndSet() method import java.util.concurrent.atomic.*; public class GFG { public static void main(String[] args) { // create an atomic reference object. AtomicReferenceArray<String> ref = new AtomicReferenceArray<String>(3); // set some value ref.set(0, "GFG"); ref.set(1, "JS"); // apply compareAndSet() boolean op1 = ref.compareAndSet( 0, "GFG", "GEEKS FOR GEEKS"); boolean op2 = ref.compareAndSet( 1, "JS", "JAVA SCRIPT"); // print System.out.println("Operation at index 0: " + op1); System.out.println("New value at index 0: " + ref.get(0)); System.out.println("Operation at index 1: " + op2); System.out.println("New value at index 1: " + ref.get(1)); } } Output: Operation at index 0: true New value at index 0: GEEKS FOR GEEKS Operation at index 1: true New value at index 1: JAVA SCRIPT References: https://docs.oracle.com/javase/10/docs/api/java/util/concurrent/atomic/AtomicReferenceArray.html#compareAndSet(int, E, E) Comment More infoAdvertise with us Next Article AtomicReferenceArray compareAndExchange() method in Java with Examples A AmanSingh2210 Follow Improve Article Tags : Java Java-Functions Java-util-concurrent-atomic package Java-AtomicReferenceArray Practice Tags : Java Similar Reads AtomicReference compareAndSet() method in Java with Examples The compareAndSet() method of a AtomicReference class is used to Atomically sets the value to newValue to AtomicReference object, if the current value of AtomicReference object equal to the expectedValue and returns the true if operation is successful else return false. 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