AtomicInteger incrementAndGet() method in Java with examples

The java.util.concurrent.atomic.AtomicInteger.incrementAndGet() is an inbuilt method in java that increases the previous value by one and returns the value after updation which is of data-type int.

Syntax:

public final int incrementAndGet()

Parameters: The function does not accepts a single parameter.

Return value: The function returns the value after increment operation is performed to the previous value.

Program below demonstrates the function:

Program 1:

// Java program that demonstrates 
// the incrementAndGet() 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); 
  
        System.out.println("Previous value: "
                           + val); 
  
        // Incremenet and get 
        int res 
            = val.incrementAndGet(); 
  
        // Prints the updated value 
        System.out.println("Current value: "
                           + res); 
    } 
} 

Output:

Previous value: 0
Current value: 1

Program 2:

// Java program that demonstrates 
// the incrementAndGet() 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); 
  
        System.out.println("Previous value: "
                           + val); 
  
        // Incremenet and get new value 
        int res = val.incrementAndGet(); 
  
        // Prints the updated value 
        System.out.println("Current value: "
                           + res); 
    } 
} 

Output:

Previous value: 18
Current value: 19

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

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