AtomicLong compareAndSet() method in Java with examples

AtomicLong decrementAndGet() method in Java with examples

Last Updated : 13 Dec, 2021

The Java.util.concurrent.atomic.AtomicLong.decrementAndGet() is an inbuilt method in java that decreases the previous value by one and returns the value after updation which is of data-type long.

Syntax:

public final long decrementAndGet()

Parameters: The function does not accepts a single parameter.
Return value: The function returns the value after decrement operation is performed to the previous value.

Below programs illustrate the above method:

Program 1:

Java

// Java program that demonstrates
// the decrementAndGet() function

import java.util.concurrent.atomic.AtomicLong;

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

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

        System.out.println("Previous value: "
                           + val);

        // Decrement and get
        long res
            = val.decrementAndGet();

        // Prints the updated value
        System.out.println("Current value: "
                           + res);
    }
}

Output:

Previous value: 0
Current value: -1

Program 2:

Java

// Java program that demonstrates
// the decrementAndGet() function

import java.util.concurrent.atomic.AtomicLong;

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

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

        System.out.println("Previous value: "
                           + val);

        // Decrement and get new value
        long res = val.decrementAndGet();

        // Prints the updated value
        System.out.println("Current value: "
                           + res);
    }
}

Output:

Previous value: 18
Current value: 17

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

AtomicLong compareAndSet() method in Java with examples

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