Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
15 Cards in this Set
- Front
- Back
|
How do you add an event handler to your source object? |
myObject.setOnAction(new myEventHandler()); |
|
|
What method do you override in the event handler? |
public void handle(ActionEvent e) |
|
|
How do you identify the source object of an event? |
getSource() |
|
|
Three types of action events fired |
ActionEvent MouseEvent KeyEvent |
|
|
True or false: inner classes are useful for defining event handler classes |
true |
|
|
How do you create an object for the inner class if the inner class is non-static? |
OuterClass.InnerClass innerObject = outerObject.new InnerClass(); |
|
|
Can you use public, private, and protected with inner classes? |
Yes. They can be subject to the same visibility rules as the outer class |
|
|
the compiler treats a lambda expression as if it is an.... |
object created from an anonymous class |
|
|
Change to lambda expression: btEnlarge.setOnAction( new EventHandler<ActionEvent>(){ @Override public void handle(ActionEvent e){ //code for handling event }}}); |
btEnlarge.setOnAction(e -> { //code for processing actionevent }); compiler automatically recognizes that the statements are for the handle method we can omit extra parentheses because there is only one parameter without an explicit data type |
|
|
How many abstract methods must the interface contain for the compiler to understand the lambda expression? |
one method ONLY |
|
|
Give examples of the type of information that a MouseEvent can collect |
number of clicks, which button, x- and y-coord of mouse, whether other keys like alt were pressed when the mouse was pressed, dragged, released, etc. |
|
|
What type of information is gathered by key events? |
character associated with key, key code, whether alt/shift/control/mouse meta were also pressed |
|
|
What does requestFocus() do and when must it be invoked? |
only a focused node can receive KeyEvent must be invoked after the stage is displayed If a button is clicked, you must request the focus again |
|
|
How do you add a listener to process a value changed in an Observable object? |
addListener(InvalidationListener listener) and override invalidated(Observable o) |
|
|
Give an example of Observable |
every binding property |
