How to do call by reference in Java?

Question

Since Java doesnt support pointers, How is it possible to call a function by reference in Java like we do in C and C++??

Answer 1

The best way is to use an interface which performs the action.

// Pass a Runnable which calls the task() method
executor.submit(new Runnable() {
    public void run() {
        task();
    }
});

public void task() { }

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You can use reflections to call any method

Method method = MyClass.class.getMethod("methodToCall", ParameterType.class);
result = method.invoke(object, args);