How do you to create a JFrame with simple text?

Question

I just want to make a JFrame that will say "Hello world", nothing big, no interaction needed. How do I do this?

I can create the JFrame, however I do not know how to put a JPanel with simple text in it.

Here is what I got so far

JFrame frame = new JFrame("Relief Valve");
frame.setResizable(false);
frame.setLocation(500,300);
JPanel p1 = new JPanel();
frame.setVisible(true);

Answer 1

Instead of creating the JPanel, try:

JLabel label = new JLabel("this is my text");
frame.add(label);
frame.pack();

Answer 2

JFrame window = new JFrame("Hello World App"); 
window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
window.setLayout(new BorderLayout());
window.add(new JLabel("Hello World"), BorderLayout.CENTER);
window.pack();
window.setVisible(true);
window.setLocationRelativeTo(null);

I'm currently on a mobile device but I'll be happy to document that when I get on a computer, feel free to ask any questions though.