How to use callbacks in Java to call functions, just as I did in c#?

I'm new to Java, but I need to write something like c# code (this is a hand-made prototype, just to illustrate what I need)

private void ParentFunc()
{
    var worker = new WorkerClass()

    worker.DoWork(e => console.Write("Progress" + e));


}

public class WorkerClass()
{
    public method DoWork(Action<int> callback)
    {
        for (int i=1; i<1000; i++) callback.Invoke(i);  
    }
}

Little explanation I use asynctask in Android and call it outside the processor, but I want them to send back signals so that I can publish progress I don't want to put the interface on my asynctask

Solution

Since closures are not supported, you must use interfaces and anonymous inner classes

private void ParentFunc {
    WorkerClass worker = new WorkerClass();

    worker.doWork(new Callback<Integer>() {
        public void invoke(Integer arg) {
            System.out.println("Progress" + arg);
        }
    });
}

public class WorkerClass {
    public doWork(Callback<Integer> callback) {
        for (int i=1; i<1000; i++) callback.invoke(i);  
    }
}

public interface Callback<T> {
    public void invoke(T arg);
}