Button jave

public class main extends javax.swing.JFrame {

   
    public main() {
        initComponents();
    }

  
    @SuppressWarnings("unchecked")
   
    private void initComponents() {

        jButton1 = new javax.swing.JButton();
        jMenuBar1 = new javax.swing.JMenuBar();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
       

        jButton1.setText("page 1");
        
        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                .addContainerGap(223, Short.MAX_VALUE)
                .addComponent(jButton1)
                .addGap(104, 104, 104))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(112, 112, 112)
                .addComponent(jButton1)
                .addGap(163, 163, 163))
        );

        pack();
   
    public static void main(String args[]) {
      
        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(main.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(main.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(main.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(main.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
     
        java.awt.EventQueue.invokeLater(new Runnable() {

            public void run() {
                new main().setVisible(true);
            }
        });
    }
   
    private javax.swing.JButton jButton1;
    private javax.swing.JMenuBar jMenuBar1;
 
}