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The java.util.concurrent.atomic.AtomicInteger.getAndIncrement() is an inbuilt method in java that increases the given value by one and returns the value before updation which is of data-type int. Syntax:

public final int getAndIncrement()

Parameters: The function does not accepts a single parameter. Return value: The function returns the value before increment operation is performed to the previous value. Program below demonstrates the function: Program 1:

Java

// Java program that demonstrates
// the getAndIncrement() 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);

        // Decreases and gets
        // the previous value
        int res
            = val.getAndIncrement();

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

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

Output:

Previous value: 0
Current value: 1

Program 2:

Java

// Java program that demonstrates
// the getAndIncrement() 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);

        // Increases 1 and gets
        // the previous value
        int res = val.getAndIncrement();

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

Output:

Previous value: 18
Current value: 19

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

AtomicInteger getAndIncrement() method in Java with examples

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