Page 35 - Dart Language

import 'other.dart';

void main() {
var b = new B();
b.testB();
}

class B extends A {
String _private;

testB() {
_private = 'Hello';
print('String value: $_private'); // Hello
testA();
print('String value: $_private'); // Hello
}
}

You get the expected output:

String value: Hello
int value: 0
int value: 5
String value: Hello

Specifying a library prefix

If you import two libraries that have conflicting identifiers, then you can specify a prefix for one or
both libraries. For example, if library1 and library2 both have an Element class, then you might
have code like this:

import 'package:lib1/lib1.dart';
import 'package:lib2/lib2.dart' as lib2;
// ...
var element1 = new Element(); // Uses Element from lib1.
var element2 =
new lib2.Element(); // Uses Element from lib2.

Importing only part of a library

If you want to use only part of a library, you can selectively import the library. For example:

// Import only foo and bar.
import 'package:lib1/lib1.dart' show foo, bar;

// Import all names EXCEPT foo.
import 'package:lib2/lib2.dart' hide foo;

Lazily loading a library

Deferred loading (also called lazy loading) allows an application to load a library on demand, if and
when it’s needed. To lazily load a library, you must first import it using deferred as.

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