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AtomicInteger getAndAdd() method in Java with examples

Last Updated : 29 Jan, 2019
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The java.util.concurrent.atomic.AtomicInteger.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 int. Syntax: 
public final int getAndAdd(int 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. Program below demonstrates the function: Program 1: Java 
// Java program that demonstrates
// the getAndAdd() function

import java.util.concurrent.atomic.AtomicInteger;

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

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

        // Adds 7 and gets the previous value
        int 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.AtomicInteger;

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

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

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

        // Adds 8 and gets the previous value
        int 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/AtomicInteger.html#getAndAdd-int-

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