How can you declare a variable that does not allow null values and assign it a specific value immediately?

In Dart (the language used in Flutter), a variable by default does not allow null values unless explicitly declared with ?. To declare a variable that cannot be null and assign it a value immediately, you just need to specify the type without ? and assign a value:

int count = 10; // count cannot be null
String name = "Flutter"; // name also cannot be null

Trying to assign null to such a variable will result in a compile-time error. This is due to Dart's null safety system.