AtomicLong getAndAdd() method in Java with examples

Last Updated : 29 Jan, 2019
The Java.util.concurrent.atomic.AtomicLong.getAndAdd() is an inbuilt method in java that adds the given value to the current value and returns the value before updation which is of data-type long. Syntax: 
public final long getAndAdd(long val)
Parameters: The function accepts a single mandatory parameter val which specifies the value to be added to the current value. Return value: The function returns the value before addition is performed to the previous value. Below programs illustrate the above method: Program 1: Java 
// Java program that demonstrates
// the getAndAdd() function

import java.util.concurrent.atomic.AtomicLong;

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

        // Initially value as 0
        AtomicLong val = new AtomicLong(0);

        // Adds 7 and gets the previous value
        long res
            = val.getAndAdd(7);

        // Prints the updated value
        System.out.println("Previous value: "
                           + res);

        System.out.println("Current value: "
                           + val);
    }
}
Output: 
Previous value: 0
Current value: 7
Program 2: Java 
// Java program that demonstrates
// the getAndAdd() function

import java.util.concurrent.atomic.AtomicLong;

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

        // Initially value as 18
        AtomicLong val = new AtomicLong(18);

        // Prints the updated value
        System.out.println("Previous value: "
                           + val);

        // Adds 8 and gets the previous value
        long res = val.getAndAdd(8);

        // Prints the updated value
        System.out.println("Previous value: "
                           + res);

        System.out.println("Current value: "
                           + val);
    }
}
Output: 
Previous value: 18
Previous value: 18
Current value: 26
Reference: https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/atomic/AtomicLong.html#getAndAdd-long-
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