What is FocusListener in Java?
Interface FocusListener The listener interface for receiving keyboard focus events on a component. The class that is interested in processing a focus event either implements this interface (and all the methods it contains) or extends the abstract FocusAdapter class (overriding only the methods of interest).
What is focus lost in Java?
For example, when the focus goes from a button to a text field, a focus-lost event is fired by the button (with the text field as the opposite component) and then a focus-gained event is fired by the text field (with the button as the opposite component). Focus-lost as well as focus-gained events can be temporary.
How do you use a focus listener?
In short, all you have to do in order to work with a FocusListener is: Create a new FocusListener. Override the methods that correspond to the events that you want to monitor about the component e.g focusGained , focusLost and customize as you wish the handling of the respective events.
What is a focus event?
The focus event fires when an element has received focus. The main difference between this event and focusin is that focusin bubbles while focus does not. The opposite of focus is blur . This event is not cancelable and does not bubble.
What is Item listener in Java?
public interface ItemListener extends EventListener. The listener interface for receiving item events. The class that is interested in processing an item event implements this interface. The object created with that class is then registered with a component using the component’s addItemListener method.
What is adjustment listener in Java?
Adjustment events notify you of changes in the value of components that implement the Adjustable. interface. Adjustable objects have an integer value, and they generate adjustment events whenever that value changes. The only AWT class that implements Adjustable is Scrollbar .
What is container listener?
Interface ContainerListener The listener interface for receiving container events. The class that is interested in processing a container event either implements this interface (and all the methods it contains) or extends the abstract ContainerAdapter class (overriding only the methods of interest).
What are key events in Java?
Class KeyEvent. An event which indicates that a keystroke occurred in a component. This low-level event is generated by a component object (such as a text field) when a key is pressed, released, or typed.
What is onfocus and Onblur?
Definition and Usage Tip: The onblur event is the opposite of the onfocus event. Tip: The onblur event is similar to the onfocusout event. The main difference is that the onblur event does not bubble. Therefore, if you want to find out whether an element or its child loses focus, you could use the onfocusout event.
What is the difference between focus and Focusin?
The focusin event fires when an element is about to receive focus. The main difference between this event and focus is that focusin bubbles while focus does not. The opposite of focusin is focusout .
What is window listener in Java?
public interface WindowListener extends EventListener. The listener interface for receiving window events. The class that is interested in processing a window event either implements this interface (and all the methods it contains) or extends the abstract WindowAdapter class (overriding only the methods of interest).
What is adjustment listener?
Interface AdjustmentListener The listener interface for receiving adjustment events.
Which is the method of adjustment listener?
The AdjustmentListener interface contains a single method, and thus has no corresponding adapter class. Here’s the method: void adjustmentValueChanged(AdjustmentEvent) Called by the AWT just after the listened-to component’s value changes.
What is Kafka listener?
The Kafka Listener is work on the publish and subscribe model. The Apache Kafka is nothing but a massaging protocol. The Kafka broker will receive the number of messages by the Kafka topics. We need to set the listener configuration correctly. While working with the Kafka listeners, we need to set the “advertised.
What is Kafka containerFactory?
The containerFactory() identifies the KafkaListenerContainerFactory to use to build the Kafka listener container. If not set, a default container factory is assumed to be available with a bean name of kafkaListenerContainerFactory unless an explicit default has been provided through configuration.