Type.registerNamespace("Demo.Trees"); Demo.Trees.IFruitTree = function() {} Demo.Trees.IFruitTree.Prototype = { bearFruit: function(){} } Demo.Trees.IFruitTree.registerInterface('Demo.Trees.IFruitTree'); Demo.Trees.Tree = function(name) { this._name = name; } Demo.Trees.Tree.prototype = { returnName: function() { return this._name; }, toStringCustom: function() { return this.returnName(); }, makeLeaves: function() {} } Demo.Trees.Tree.registerClass('Demo.Trees.Tree'); Demo.Trees.FruitTree = function(name, description) { Demo.Trees.FruitTree.initializeBase(this, [name]); this._description = description; } Demo.Trees.FruitTree.prototype.bearFruit = function() { return this._description; } Demo.Trees.FruitTree.registerClass('Demo.Trees.FruitTree', Demo.Trees.Tree, Demo.Trees.IFruitTree); Demo.Trees.Apple = function() { Demo.Trees.Apple.initializeBase(this, ['Apple', 'red and crunchy']); } Demo.Trees.Apple.prototype = { makeLeaves: function() { alert('Medium-sized and desiduous'); }, toStringCustom: function() { return 'FruitTree ' + Demo.Trees.Apple.callBaseMethod(this, 'toStringCustom'); } } Demo.Trees.Apple.registerClass('Demo.Trees.Apple', Demo.Trees.FruitTree); Demo.Trees.GrannySmith = function() { Demo.Trees.GrannySmith.initializeBase(this); // You must set the _description feild after initializeBase // or you will get the base value. this._description = 'green and sour'; } Demo.Trees.GrannySmith.prototype.toStringCustom = function() { return Demo.Trees.GrannySmith.callBaseMethod(this, 'toStringCustom') + ' ... its GrannySmith!'; } Demo.Trees.GrannySmith.registerClass('Demo.Trees.GrannySmith', Demo.Trees.Apple); Demo.Trees.Banana = function(description) { Demo.Trees.Banana.initializeBase(this, ['Banana', 'yellow and squishy']); } Demo.Trees.Banana.prototype.makeLeaves = function() { alert('Big and green'); } Demo.Trees.Banana.registerClass('Demo.Trees.Banana', Demo.Trees.FruitTree); Demo.Trees.Pine = function() { Demo.Trees.Pine.initializeBase(this, ['Pine']); } Demo.Trees.Pine.prototype.makeLeaves = function() { alert('Needles in clusters'); } Demo.Trees.Pine.registerClass('Demo.Trees.Pine', Demo.Trees.Tree);