Two threads

Main.java

package io.mirko;

public class Main {
    static volatile boolean condition = true;
    public static void main(String ... args) throws Exception {
        new Thread(new AnotherThread()).start();
        if (condition) {
            methodA();
        }
    }

    public static void methodA() {
        synchronized(Main.class){
            if (condition) {
                condition = false;
                System.out.println(Thread.currentThread());
            } else {
                Thread.currentThread().interrupt();
            }
        }
    }
}

class AnotherThread implements Runnable{
    @Override
    public void run(){
        if(Main.condition) {
            Main.methodA();
        }
    }
}