Question

I wrote this code to return value from calculator:

try {
    startActivity(intent);

    @Override
    protected void onActivityResult (int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (resultCode == Activity.RESULT_OK) {
            // User pressed OK.
            double value = data.getDoubleExtra("X", Double.NaN);
            if (Double.isNaN(value)) {
                // Calculation result was "Error".
            } else {
                // Calculation result ok.
            }
        } else {
        // User pressed cancel or back button.
        }
    }
}

And it gives me syntax mistakes for brackets, commas and word Intent in the line:

protected void onActivityResult (int requestCode, int resultCode, Intent data) {

some why it requires semicolon instead of all those signs. Do you have an idea why?

Answer 1

This code:

protected void onActivityResult (int requestCode, int resultCode, Intent data)...

declares a method. You can’t just declare a method anywhere; it must be in a class body. Here you’re trying to declare onActivityResult in another method but Java does not allow that.