In Dart, you can import code from another file using the import keyword. Here is an example:
// file1.dart
void printMessage() {
print('Hello, World!');
}
// main.dart
import 'file1.dart';
void main() {
printMessage();
}
In this example, we have two Dart files. The first file, file1.dart, defines a function printMessage() that prints a message to the console. The main.dart file imports the file1.dart file using the import keyword and calls the printMessage() function.
Note that when importing a file, you can either specify a relative or an absolute path. In the example above, we specified a relative path to import file1.dart.
You can also use the show and hide keywords to control which specific parts of the imported file you want to use. Here is an example:
// file2.dart
void printMessage() {
print('Hello, World!');
}
void printName() {
print('My name is Dart!');
}
// main.dart
import 'file2.dart' hide printMessage;
void main() {
printName(); // calls the printName() function from file2.dart
printMessage(); // Error: printMessage is not defined
}
In this example, the main.dart file imports the file2.dart file and uses the hide keyword to exclude the printMessage() function from being imported. This means that the printName() function from file2.dart can be called, but the printMessage() function cannot be called from the imported file.