public class SyncBlock {
    private long c1 = 0;
    private long c2 = 0;
    private Object lock1 = new Object();
    private Object lock2 = new Object();

    public void inc1() {
        synchronized(lock1) {
            while(true) {
               for(long i=0; i<999999999L; i++)
                 ;
               System.out.println("Counter1: "+ ++c1);
            }
        }
    }

    public void inc2() {
        synchronized(lock2) {
            while(true) {
               for(long i=0; i<999999999L; i++)
                 ;
               System.out.println("Counter2: "+ ++c2);
            }
        }
    }
}