AtomicInteger getAndAdd() method in Java with examples

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:

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// 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);
    }
}

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Output:

Previous value: 0
Current value: 7

Program 2:

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// 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);
    }
}

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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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