Inheriting from Classes

lesson#19.2 - Inheriting from classes/inheritance.d

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+module inheritance;
+
+// ****** Inheriting from Classes: Implementation Inheritance  ******
+import std.stdio: writeln;
+
+class Person {
+	string id;
+
+	void speak() {
+		writeln("Hello, world!");
+	}
+}
+
+class John: Person {
+	// inherits: string id;
+
+	this(string s) {
+		id = s; 
+	}
+
+	// redifining the inherited speak function of Person
+	override void speak() {
+		super.speak();	// calling the default(Person's) speak function
+		writeln("Hi! My id is: ", id, ".");
+	}
+}
+
+class Anna: Person {
+	// inherits: string id;
+
+	this(string s) {
+		id = s; 
+	}
+
+	// Anna inherits the default implementation
+}
+
+
+
+
+
+
+
+
+
+

lesson#19.2 - Inheriting from classes/main.d

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+import inheritance;
+
+void main() {
+	John john = new John("123456");
+	john.speak();
+
+	Anna anna = new Anna("098700");
+	anna.speak();
+}
+
+/*	OUTPUT:
+
+	Hello, world!
+	Hi! My id is: 123456.
+	Hello, world!
+*/