observer pattern

How does Java know when a JButton has been pressed?

I'm learning Java Swing and trying to understand how event handling works. In this code, the frame implements ActionListener and registers itself with button.addActionListener(this). When the button is…

How does JButton know when it has been clicked?

I'm learning Java Swing and trying to understand how event handling works. In this example, the frame implements ActionListener, and the button is registered with button.addActionListener(this). When the…

Which Design Patterns Are Most Common in Everyday Professional Programming?

I'm familiar with many design patterns, but I'd like to understand which ones tend to appear most often in real-world software development. Are there particular patterns professionals use…