AtomicLongArray decrementAndGet() method in Java with Examples

The Java.util.concurrent.atomic.AtomicLongArray.decrementAndGet() is an inbuilt method in Java that atomically decrements by one the element at a given index. This method takes the index value and the value to be added as the parameters and returns the updated value at this index.

Syntax:

public final long decrementAndGet(int i)

Parameters: The function accepts a single parameter i which is the index where decrement by one operation is performed.



Return value: The function returns the updated value which is in long.

Below programs illustrate the above method:
Program 1:

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// Java program that demonstrates
// the compareAndSet() function
  
import java.util.concurrent.atomic.AtomicLongArray;
  
public class GFG {
    public static void main(String args[])
    {
        // Initializing an array
        long a[] = { 1, 2, 3, 4, 5 };
  
        // Initializing an AtomicLongArray with array a
        AtomicLongArray arr = new AtomicLongArray(a);
  
        // Displaying the AtomicLongArray
        System.out.println("The array : " + arr);
  
        // Index where operation is performed
        int idx = 3;
  
        // Updating the value at
        // idx applying decrementAndGet
        arr.decrementAndGet(idx);
  
        // Displaying the AtomicLongArray
        System.out.println("The array after update : "
                           + arr);
    }
}

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Output:

The array : [1, 2, 3, 4, 5]
The array after update : [1, 2, 3, 3, 5]

Program 2:

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// Java program that demonstrates
// the compareAndSet() function
  
import java.util.concurrent.atomic.AtomicLongArray;
  
public class GFG {
    public static void main(String args[])
    {
        // Initializing an array
        long a[] = { 1, 2, 3, 4, 5 };
  
        // Initializing an AtomicLongArray with array a
        AtomicLongArray arr = new AtomicLongArray(a);
  
        // Displaying the AtomicLongArray
        System.out.println("The array : " + arr);
  
        // Index where operation is performed
        int idx = 0;
  
        // Updating the value at
        // idx applying decrementAndGet
        arr.decrementAndGet(idx);
  
        // Displaying the AtomicLongArray
        System.out.println("The array after update : "
                           + arr);
    }
}

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Output:

The array : [1, 2, 3, 4, 5]
The array after update : [0, 2, 3, 4, 5]

Reference:
https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/atomic/AtomicLongArray.html#decrementAndGet-int-



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