AtomicInteger getAndSet() method in Java with examples

0 1 1 minute read

The java.util.concurrent.atomic.AtomicInteger.getAndSet() is an inbuilt method in java that sets the given value to the value passed in the parameter and returns the value before updation which is of data-type int.

Syntax:

public final int getAndSet(int val)

Parameters: The function accepts a single mandatory parameter val which specifies the value to be updated.

Return value: The function returns the value before update operation is performed to the previous value.

Program below demonstrates the function:

Program 1:

// Java program that demonstrates
// the getAndSet() 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);
  
        // Updates and sets
        int res
            = val.getAndSet(10);
  
        System.out.println("Previous value: "
                           + res);
  
        // Prints the updated value
        System.out.println("Current value: "
                           + val);
    }
}

Output:

Previous value: 0
Current value: 10

Program 2:

// Java program that demonstrates
// the getAndSet() 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);
  
        // Gets and updates
        int res = val.getAndSet(12);
  
        System.out.println("Previous value: "
                           + res);
        // Prints the updated value
        System.out.println("Current value: "
                           + val);
    }
}