JFrame: setAlwaysOnTop(boolean alwaysOnTop)
import javax.swing.JFrame; import javax.swing.JLabel; public class Main{ public static void main(String[] args) { JFrame frame = new JFrame("Hello!!"); frame.setAlwaysOnTop(true); frame.setLocationByPlatform(true); frame.add(new JLabel(" Always visible")); frame.pack(); frame.setVisible(true); } }