AtomicReferenceArray getOpaque() method in Java with Examples

Last Updated : 02 Jun, 2020

The getOpaque() method of a AtomicReferenceArray class is used to return the value of the element at index i for this AtomicReferenceArray object with memory effects as specified by VarHandle.getOpaque(java.lang.Object...). This VarHandle.getOpaque(java.lang.Object...) method handles operation with no assurance of memory ordering effects with respect to other threads. Syntax:

public final E getOpaque(int i)

Parameters: This method accepts the index i to get the value. Return value: This method returns the current value at index i. Below programs illustrate the getOpaque() method: Program 1:

Java

// Java program to demonstrate
// AtomicReferenceArray.getOpaque() method

import java.util.concurrent.atomic.*;

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

        // create an atomic reference array
        // object which stores Integer.
        AtomicReferenceArray<Integer> array
            = new AtomicReferenceArray<Integer>(5);

        // set some value in array
        array.set(0, 987);
        array.set(1, 988);
        array.set(2, 989);
        array.set(3, 986);

        // get and print the value
        // using getOpaque method
        for (int i = 0; i < 4; i++) {

            int value = array.getOpaque(i);
            System.out.println("value at "
                               + i + " = "
                               + value);
        }
    }
}

Output:

Program 2:

Java

// Java program to demonstrate
// AtomicReferenceArray.getOpaque() method

import java.util.concurrent.atomic.*;

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

        // create a array of Strings
        String[] names
            = { "AMAN", "AMAR", "SURAJ" };

        // create an atomic reference object.
        AtomicReferenceArray<String> array
            = new AtomicReferenceArray<String>(names);

        // get and print the value
        // using getOpaque method
        for (int i = 0; i < array.length(); i++) {

            String value = array.getOpaque(i);
            System.out.println("value at "
                               + i + " = "
                               + value);
        }
    }
}