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Added section on abstract classes/methods

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Milo Gilad 2017-08-25 13:24:01 -04:00
parent bf7ed153ee
commit a6359357fd
1 changed files with 28 additions and 0 deletions
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@ -353,6 +353,34 @@ class SubDemo : SuperDemo {
}
}
// Abstract Classes and Methods
public abstract class OperatingSystem : GLib.Object {
public void turn_on() {
stdout.printf("Booted successfully.\n");
}
public abstract void use_computer();
}
public class Ubuntu : OperatingSystem {
public override void use_computer() { // Abstract methods must be overridden
stdout.printf("Beep boop\n");
}
}
// Add default behavior to an abstract method by making it "virtual".
public abstract class HardDrive : GLib.Object {
public virtual void die() {
stdout.printf("CLICK-CLICK-CLICK\n");
}
}
public class MyHD : HardDrive {
public override void die() {
return;
}
}
```
* More Vala documentation can be found [here](https://valadoc.org/).
* Read about building GUIs with GTK+ and Vala [here](http://archive.is/7C7bw).