Java event handling allows code to react to user or system events like button clicks. A class can implement the ActionListener interface to define an actionPerformed method that will be called when an event like a button click occurs. The code creates a text field and button, adds an action listener to the button so that when clicked, the text field will display "Welcome", and sets the frame to visible.

1. 1
Java Event Handling

2. Java Event Handling Code
▸ Within class
▸ Other class
▸ Anonymous class
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3. Java Event Handling Code
import java.awt.*;
import java.awt.event.*;
//create components
t=new TextField();
t.setBounds(70,60,120,10);
Button b1=new Button("click me");
b1.setBounds(80,100,70,30);
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4. Contd..
a.addActionListener(this);
add(a); add(t);
setSize(300,300);
setLayout(null);
setVisible(true);
public void actionPerformed(ActionEvent e){
t.setText("Welcome");
}
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5. Output:
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