I am designing, implementing, testing, and debuging a GUI-based version of a “Hello, World!” program in a JFrame that includes a JLabel that reads “Hello, World!” and I am trying to use a layout manager, and an Exit button to close the program.

Here's what I have so far, I would really apreciate if you could help on it syntax. I am 90% done but tried hard and it couldn't run.

 import java.awt.*; // Needed for flow layout manager
 import javax.swing.*; //All swing components live in the javax.swing package
 import javax.swing.JButton;  //to recognize buttons
 import javax.swing.JFrame;
 import javax.swing.JPanel;
 import javax.swing.JTextField;

public class HelloWorld {
    public static void main(String[] args) {
        //creates the label.  The JLabel constructor
        //takes an optional argument which set the text of the label

        /* The text will be aligned with the center of the frame
         * otherwise it will align on the left.
         */
        JLabel label= new JLabel("Hello World!");


        new FlowWindow();
        label.setHorizontalAlignment (SwingConstants.CENTER);

        JFrame frame = new JFrame("Hello");

        //create exit button
        JButton button1 = new JButton("Exit");
        //Add exit button to the content pane.
        add(button1);
        frame.add(label);

        frame.setSize(300, 300);

        frame.setVisible(true);
        frame.setLocationRelativeTo(null);
        frame.toFront();    

    }
    public static void FlowWindow()
    {
        //Add a new FlowLayout());
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }
}