JAVA

jbutton actionlistener

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

java button 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.");
})