Demonstrate the use of Event Listener interfaces.
Question
Demonstrate the use of Event Listener interfaces.
Solution
Event Listener interfaces are used in programming languages like Java to handle events. They are part of the Java's Event Handling mechanism. Here is a simple example of how to use an Event Listener interface in Java:
Step 1: Import necessary packages
import java.awt.*;
import java.awt.event.*;
Step 2: Create a class that implements the ActionListener interface
class MyActionListener implements ActionListener{
public void actionPerformed(ActionEvent e){
System.out.println("Button clicked");
}
}
Step 3: Create a class for your GUI component (e.g., a button) and add the listener to it
class ButtonExample{
public static void main(String[] args){
Frame f=new Frame("Button Example");
Button b=new Button("Click Here");
b.setBounds(50,100,80,30);
MyActionListener listener = new MyActionListener();
b.addActionListener(listener);
f.add(b);
f.setSize(400,400);
f.setLayout(null);
f.setVisible(true);
}
}
In this example, when the button is clicked, the actionPerformed method of the MyActionListener class is called, and "Button clicked" is printed to the console.
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