[java] (7) set jPanel into jFrame

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package pos_system;



import java.awt.*;

import java.awt.event.*;

import javax.swing.*;



/* FrameDemo.java requires no other files. */

public class FrameDemo {

    /**

     * Create the GUI and show it.  For thread safety,

     * this method should be invoked from the

     * event-dispatching thread.

     */

    private static void createAndShowGUI() {

        //Create and set up the window.

        JFrame frame = new JFrame("FrameDemo");

        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        

        Test2 sale_tabaco = new Test2(); // Test2己經設計好 jPanel, 直接拿來套用

        sale_tabaco.setPreferredSize(new Dimension(350, 650));

        frame.getContentPane().add(sale_tabaco, BorderLayout.CENTER);



        //Display the window.

        frame.pack();

        frame.setVisible(true);

    }



    public static void main(String[] args) {

        //Schedule a job for the event-dispatching thread:

        //creating and showing this application's GUI.

        javax.swing.SwingUtilities.invokeLater(new Runnable() {

            public void run() {

                createAndShowGUI();

            }

        });

    }

}

Reference :

How to Make Frames (Main Windows)