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  1. /*
  2.  * To change this template, choose Tools | Templates
  3.  * and open the template in the editor.
  4.  */
  5.  
  6. /**
  7.  *
  8.  * @author Administrator
  9.  */
  10. import java.sql.*;
  11.  
  12. public class NewJFrame extends javax.swing.JFrame {
  13. Connection conn=null;
  14.     /**
  15.      * Creates new form NewJFrame
  16.      */
  17.     public NewJFrame() {
  18.         initComponents();
  19.     }
  20.  
  21.     /**
  22.      * This method is called from within the constructor to initialize the form.
  23.      * WARNING: Do NOT modify this code. The content of this method is always
  24.      * regenerated by the Form Editor.
  25.      */
  26.     @SuppressWarnings("unchecked")
  27.     // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
  28.     private void initComponents() {
  29.  
  30.         setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
  31.         addWindowListener(new java.awt.event.WindowAdapter() {
  32.             public void windowOpened(java.awt.event.WindowEvent evt) {
  33.                 formWindowOpened(evt);
  34.             }
  35.         });
  36.  
  37.         javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
  38.         getContentPane().setLayout(layout);
  39.         layout.setHorizontalGroup(
  40.             layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
  41.             .addGap(0, 567, Short.MAX_VALUE)
  42.         );
  43.         layout.setVerticalGroup(
  44.             layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
  45.             .addGap(0, 512, Short.MAX_VALUE)
  46.         );
  47.  
  48.         pack();
  49.     }// </editor-fold>                        
  50.  
  51.     private void formWindowOpened(java.awt.event.WindowEvent evt) {                                  
  52.         // TODO add your handling code here:
  53.         conn =Connect.ConnectionDB();
  54.     }                                 
  55.  
  56.     /**
  57.      * @param args the command line arguments
  58.      */
  59.     public static void main(String args[]) {
  60.         /* Set the Nimbus look and feel */
  61.         //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
  62.         /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
  63.          * For details see http://d...content-available-to-author-only...e.com/javase/tutorial/uiswing/lookandfeel/plaf.html 
  64.          */
  65.         try {
  66.             for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
  67.                 if ("Nimbus".equals(info.getName())) {
  68.                     javax.swing.UIManager.setLookAndFeel(info.getClassName());
  69.                     break;
  70.                 }
  71.             }
  72.         } catch (ClassNotFoundException ex) {
  73.             java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
  74.         } catch (InstantiationException ex) {
  75.             java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
  76.         } catch (IllegalAccessException ex) {
  77.             java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
  78.         } catch (javax.swing.UnsupportedLookAndFeelException ex) {
  79.             java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
  80.         }
  81.         //</editor-fold>
  82.  
  83.         /* Create and display the form */
  84.         java.awt.EventQueue.invokeLater(new Runnable() {
  85.             public void run() {
  86.                 new NewJFrame().setVisible(true);
  87.             }
  88.         });
  89.     }
  90.     // Variables declaration - do not modify                     
  91.     // End of variables declaration                   
  92. }
  93.  
Compilation error #stdin compilation error #stdout 0s 0KB
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stdin
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Standard input is empty
compilation info 
Main.java:12: error: class NewJFrame is public, should be declared in a file named NewJFrame.java
public class NewJFrame extends javax.swing.JFrame {
       ^
Main.java:53: error: cannot find symbol
        conn =Connect.ConnectionDB();
              ^
  symbol:   variable Connect
  location: class NewJFrame
2 errors
stdout
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Standard output is empty
https://ideone.com/QTcaJ2
language:
Java (HotSpot 12)
created:
12 years ago
visibility:
public

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