Knowing About AtomicInteger

In some case, you will need variable which is need to be more reliable to count something on high speed process. If usually you use int to count something, now you need to consider about AtomicInteger. This class is under concurrent package so it can realiable for your multithread application process. This class even have wait() method 🙂

Simple example:

import java.util.concurrent.atomic.AtomicInteger;
import org.apache.commons.lang.math.NumberUtils;

public class Main {
    public static void main(String[]args) throws IOException{  
        AtomicInteger i;
        String value;
        BufferedReader source = new BufferedReader(new InputStreamReader(;
        try {            
            System.out.println("please input number: ");
            value = source.readLine();
                i = new AtomicInteger(Integer.valueOf(value));
                System.out.println("this is value of i : " + i.get());
                System.out.println("this value using addAndGet(2) : " + i.addAndGet(2)); //add 2 then print
                System.out.println("this value after using incrementAndGet : " + i.incrementAndGet()); 
                System.out.println("this value after using decrementAndGet : " + i.decrementAndGet());
                System.out.println("this value after using getAndAdd(5) : " + i.getAndAdd(5)); // get then add 5
                System.out.println("current value : " + i.get());
            } else {
                System.out.println("wrong number");
        } catch (Exception e) {


please input number: 
this is value of i : 3
this value using addAndGet(2) : 5
this value after using incrementAndGet : 6
this value after using decrementAndGet : 5
this value after using getAndAdd(5) : 5
current value : 10

For more documentation about this class, you can go to the site.

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