รู้จักกับ Java กับ JFrame เครื่องมือหลักในการสร้าง GUI Window Form ด้วย JFrame

import javax.swing.JFrame;

package com.java.myapp;

import javax.swing.JFrame;

public class  MyClass {
	
    public static void main(String[] args) {
        JFrame frame = new JFrame("A JFrame");
        frame.setSize(250, 250);
        frame.setLocation(300,200);
        frame.setVisible(true);
    }
    
}

package com.java.myapp;

import javax.swing.JFrame;
import javax.swing.JLabel;

public class MyClass extends MyClass {

	public static void main(String[] args) {
		MyClass frame = new MyClass();
		frame.setVisible(true);
	}

	public MyClass() {

		// JFrame Property
		super("ThaiCreate.Com Tutorial Java GUI"); // Title
		setSize(300, 200);
		setLocation(500, 280);
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		getContentPane().setLayout(null);

		// Text Label
		JLabel welcome = new JLabel("Welcome to ThaiCreate.Com");
		welcome.setBounds(70, 50, 164, 60);
		getContentPane().add(welcome);

	}

}

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package com.java.myapp;

/**
 *
 * @author WEERACHAI
 */
public class MyFormFirst extends javax.swing.JFrame {

    /**
     * Creates new form MyFormFirst
     */
    public MyFormFirst() {
        initComponents();
    }

    /**
     * This method is called from within the constructor to initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is always
     * regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 400, Short.MAX_VALUE)
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 300, Short.MAX_VALUE)
        );

        pack();
    }// </editor-fold>                        

    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        /* Set the Nimbus look and feel */
        //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
        /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
         * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html 
         */
        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException ex) {
            java.util.logging.Logger.getLogger(MyFormFirst.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(MyFormFirst.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(MyFormFirst.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(MyFormFirst.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>

        /* Create and display the form */
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new MyFormFirst().setVisible(true);
            }
        });
    }
    // Variables declaration - do not modify                     
    // End of variables declaration                   
}