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When anything is typing, the label will be displayed on the basis of that. This program simply displays the key event that is happening. on clicking the button, text field data will be read Lb1= new Label(" Key Events will be displayed based on the actions", Label. Public class JavaKeyListenerExample implements KeyListenerįr = new Frame("KeyEventListener Example") Java program to demonstrate the KeyListener. In the following article, we are going to see how Java is used to monitor the key events happening in our applications.

After the invocation, the KeyEvent is passed to it.

This will help in the invocation of the relevant method in the object of the listener.

Since the object is already registered with the listener using the addKeyListener method, an event will be generated on press, type and release states of Key.

When there is a class that has to process certain Key events, an object should be present in that which helps in implementing the interface.

KeyTyped ( KeyEvent ev): This method will be invoked when Key is typed.įollowing are some points which show the working:.

KeyReleased ( KeyEvent ev): This method will be invoked when a key is released.

KeyPresses ( KeyEvent ev): This method will be invoked when Key is pressed.

The following are the commonly used methods:

Public interface KeyListener extends EventListener Methods of Java KeyListener

Java KeyListener interface can be declared using the below syntax.

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