LockWithCustomVar.java

package threadSynchronizationDemo;

public class LockWithCustomVar {

    private static int counter1=0;
    private static int counter2=0;

    private static final Object lock1=new Object();
    private static final Object lock2=new Object();

    public static void main(String[] args) {
        Thread one = new Thread(()->{
            for (int i = 0; i < 10; i++) {
                increment1();
            }
        });

        Thread two = new Thread(()->{
            for (int i = 0; i < 10; i++) {
                increment2();
            }
        });

        one.start();

        two.start();


        try {
            one.join();
            two.join();
        } catch (InterruptedException e) {
            throw new RuntimeException(e);
        }
        System.out.println(counter1 +" == "+counter2);
    }

    private static void increment1(){
        synchronized (lock1){
            counter1++;
            System.out.println("Incremented counter1 to "+counter1+" using "+Thread.currentThread().getName());
        }
    }
    private static void increment2(){
        synchronized (lock2){
            counter2++;
            System.out.println("Incremented counter2 to "+counter2+" using "+Thread.currentThread().getName());
        }
    }


}