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:
// 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);
}
} |
Output:
The array : [1, 2, 3, 4, 5] The array after update : [1, 2, 3, 3, 5]
Program 2:
// 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);
}
} |
Output:
The array : [1, 2, 3, 4, 5] The array after update : [0, 2, 3, 4, 5]