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In addition to the differences in the way that references to the six component objects are accessed, Listing 7 contains other significant differences aswell.
No code to instantiate the six component objects
First, there is no code in Listing 7 to instantiate the six component objects. As I mentioned earlier, those objects wereinstantiated and used to populate the six-element array referred to by components when the array was created.
Only one statement calling the addChild method in QuizB
Next, you will notice that there are six statement making calls to the addChild method of the VBox container in Listing 6. Calls to that method cause the components to be added as children of the container.
Those six calls to the addChild method were consolidated into a single call inside a for loop in Listing 7. This is possible because the six references are contained in an array whoseelements can be accessed using a numeric index.
The checkButtonHandler for QuizB
Listing 8 shows the checkButtonHandler method for the class named QuizA .
private function checkButtonHandler(
event:MouseEvent):void{result.visible=true;if(theAnswer == "0"){
correctAnswer = choice00.label;}else if(theAnswer == "1"){
correctAnswer = choice01.label;}else{
correctAnswer = choice02.label;}//end elseif((theAnswer=="0"&&choice00.selected) ||
(theAnswer=="1"&&choice01.selected) ||
(theAnswer=="2"&&choice02.selected)){result.setStyle("color",0x00ff00);
result.text = "Correct\nCorrect Answer is: "+ correctAnswer;
}else{result.setStyle("color",0xff0000);
result.text = "Wrong\nCorrect Answer is: "+ correctAnswer;
}//end else}//end checkButtonHandler This is the event handler method that is registered for a click event on the Button by the code in Listing 6.
The checkButtonHandler for QuizB
Listing 9 shows the corresponding checkButtonHandler method for the class named QuizB .
private function checkButtonHandler(
event:MouseEvent):void{components[5].visible=true;if(theAnswer == "0"){correctAnswer = components[1].label;}else if(theAnswer == "1"){
correctAnswer = components[2].label;
}else{correctAnswer = components[3].label;}//end elseif((theAnswer=="0"&&components[1].selected) ||(theAnswer=="1"&&components[2].selected) ||(theAnswer=="2"&&components[3].selected)){components[5].setStyle("color",0x00ff00);
components[5].text =
"Correct\nCorrect Answer is: "+ correctAnswer;
}else{components[5].setStyle("color",0xff0000);components[5].text = "Wrong\nCorrect Answer is: "+ correctAnswer;
}//end else}//end checkButtonHandler This is the event handler method that is registered for a click event on the Button by the code in Listing 7.
Differences between the code
The differences between the methods named checkButtonHandler in the two classes result from the different access requirements for the three radiobuttons and the text area at the bottom of the question objects in Figure 1.
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