JAVA

actionListener java

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

/*in main*/
button.addActionListener(new ActionListener() {
  public void actionPerformed(ActionEvent e) {
			System.out.println('x');
  }
});

java actionlistener

import java.awt.event.ActionListener; //For action listener
import javax.swing.*; //For JButton

// Inside of function or method
JButton button = new JButton();
button.addActionListener(e -> {
	System.out.println("Another way of writing an action listener.");
})

java actionlistener

import javax.swing.*;
import java.awt.event.*;

public class JButtonExample
{
  public static void main(String[] args) 
  {
    JFrame frame = new JFrame("ActionListener Example");
    JButton btn = new JButton("Click here");
    btn.setBounds(70,80,100,30);
    //Change button text on click
    btn.addActionListener(new ActionListener() {
       public void actionPerformed(ActionEvent ae) {
                      btn.setText("OK");
       }
    });
    frame.add(btn);
    frame.setSize(250,250);
    frame.setLayout(null);
    frame.setVisible(true);  
  }
}

java actionevent

public void actionPerformed(ActionEvent e) {
  
if(e.getSource()==button)  {
    button.setText("Button Clicked!");
  
}}

actionlistener java

JButton Button = new JButton();
Button.setSize(300,300);
Button.addActionListener(new ActionListener() {
	public void actionPerformed(ActionEvent e) 
    System.out.println(BlockNumber)
  	}
});

actionlistener java

button.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                System.out.println("hello world");
            }
        });

ActionEvent java swing

A semantic event which indicates that a component-defined action 
occurred. This high-level event is generated by a component 
(such as a Button) when the component-specific action occurs 
(such as being pressed). The event is passed to every ActionListener 
object that registered to receive such events using the component's 
addActionListener method.