public class GenericsExample {

private Map<?, Processor<?>> processors = new HashMap<>();

public <O> void parameterisedMethod(O o) {
    processors.put(o, new Processor<O>());
}

static class Processor<T> {
    void process(T t) {
        System.out.println(t + " processed.");
    }
}

public static void main(String[] args) {}
}