Make a JFrame always visible

    
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);
  }
}

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Make a JFrame always visible : Frame « Swing JFC « Java

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