如何在一个程序中创建多个GUI表单？

Question

我在做一个写入sql数据库的项目。我现在的问题是，我不知道如何在一个程序中创建多个表单。我正在使用JGrasp编写程序。

我得到的错误是在我尝试添加第二个表单之后。它说：

StartMenuOptions.java:126: error: modifier private not allowed here

我的代码包含如下：

public class StartMenuOptions extends javax.swing.JFrame { 

/** 
* Creates new form StartMenuOptions 
*/ 
public StartMenuOptions() { 
    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() { 

    jLabel1 = new javax.swing.JLabel(); 
    jButton1 = new javax.swing.JButton(); 
    jButton2 = new javax.swing.JButton(); 
    jButton3 = new javax.swing.JButton(); 
    jButton4 = new javax.swing.JButton(); 
    jLabel2 = new javax.swing.JLabel(); 

    setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE); 

    jLabel1.setFont(new java.awt.Font("Tahoma", 0, 14)); // NOI18N 
    jLabel1.setText("Welcome to the Entertainment Data Base"); 

    jButton1.setText("ADD"); 

    jButton2.setText("EDIT"); 

    jButton3.setText("DELETE"); 

    jButton4.setText("REPORTS"); 

    jLabel2.setText("What Action do you want to Perform?"); 

    javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane()); 
    getContentPane().setLayout(layout); 
    layout.setHorizontalGroup(
     layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
     .addGroup(layout.createSequentialGroup() 
      .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
       .addGroup(layout.createSequentialGroup() 
        .addGap(143, 143, 143) 
        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false) 
         .addComponent(jButton4, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE) 
         .addComponent(jButton1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE) 
         .addComponent(jButton2, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE) 
         .addComponent(jButton3, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))) 
       .addGroup(layout.createSequentialGroup() 
        .addGap(62, 62, 62) 
        .addComponent(jLabel1)) 
       .addGroup(layout.createSequentialGroup() 
        .addGap(90, 90, 90) 
        .addComponent(jLabel2))) 
      .addContainerGap(44, Short.MAX_VALUE)) 
    ); 
    layout.setVerticalGroup(
     layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
     .addGroup(layout.createSequentialGroup() 
      .addContainerGap() 
      .addComponent(jLabel1) 
      .addGap(31, 31, 31) 
      .addComponent(jLabel2) 
      .addGap(18, 18, 18) 
      .addComponent(jButton1) 
      .addGap(18, 18, 18) 
      .addComponent(jButton2) 
      .addGap(18, 18, 18) 
      .addComponent(jButton3) 
      .addGap(18, 18, 18) 
      .addComponent(jButton4) 
      .addContainerGap(63, 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(StartMenuOptions.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); 
    } catch (InstantiationException ex) { 
     java.util.logging.Logger.getLogger(StartMenuOptions.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); 
    } catch (IllegalAccessException ex) { 
     java.util.logging.Logger.getLogger(StartMenuOptions.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); 
    } catch (javax.swing.UnsupportedLookAndFeelException ex) { 
     java.util.logging.Logger.getLogger(StartMenuOptions.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 StartMenuOptions().setVisible(true); 
     } 
    }); 
} 
// Variables declaration - do not modify      
private javax.swing.JButton jButton1; 
private javax.swing.JButton jButton2; 
private javax.swing.JButton jButton3; 
private javax.swing.JButton jButton4; 
private javax.swing.JLabel jLabel1; 
private javax.swing.JLabel jLabel2; 
// End of variables declaration     

}

private class Add extends javax.swing.JFrame { 

/** 
* Creates new form Add 
*/ 
public Add() { 
    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() { 

    jLabel1 = new javax.swing.JLabel(); 
    jRadioButton1 = new javax.swing.JRadioButton(); 
    jRadioButton2 = new javax.swing.JRadioButton(); 
    jButton1 = new javax.swing.JButton(); 
    jButton2 = new javax.swing.JButton(); 
    jLabel2 = new javax.swing.JLabel(); 
    jLabel3 = new javax.swing.JLabel(); 
    jLabel4 = new javax.swing.JLabel(); 
    jTextField1 = new javax.swing.JTextField(); 
    jTextField2 = new javax.swing.JTextField(); 
    jTextField3 = new javax.swing.JTextField(); 
    jLabel5 = new javax.swing.JLabel(); 

    setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE); 

    jLabel1.setText("ADD"); 

    jRadioButton1.setText("Movies"); 

    jRadioButton2.setText("Music"); 

    jButton1.setText("Back"); 

    jButton2.setText("Submit"); 

    jLabel2.setText("Title"); 

    jLabel3.setText("Time min.sec"); 

    jLabel4.setText("Year"); 

    jTextField1.setText("jTextField1"); 

    jTextField2.setText("jTextField2"); 

    jTextField3.setText("jTextField3"); 

    jLabel5.setText("ex:(10.33)"); 

    javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane()); 
    getContentPane().setLayout(layout); 
    layout.setHorizontalGroup(
     layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
     .addGroup(layout.createSequentialGroup() 
      .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING) 
       .addComponent(jButton1, javax.swing.GroupLayout.Alignment.LEADING) 
       .addGroup(javax.swing.GroupLayout.Alignment.LEADING, layout.createSequentialGroup() 
        .addGap(41, 41, 41) 
        .addComponent(jRadioButton1))) 
      .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
       .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
        .addGroup(layout.createSequentialGroup() 
         .addGap(29, 29, 29) 
         .addComponent(jButton2) 
         .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)) 
        .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup() 
         .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE) 
         .addComponent(jRadioButton2) 
         .addGap(24, 24, 24))) 
       .addGroup(layout.createSequentialGroup() 
        .addGap(52, 52, 52) 
        .addComponent(jLabel1) 
        .addContainerGap()))) 
     .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup() 
      .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING) 
       .addComponent(jLabel4) 
       .addComponent(jLabel3) 
       .addComponent(jLabel2)) 
      .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
       .addGroup(layout.createSequentialGroup() 
        .addGap(74, 74, 74) 
        .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) 
        .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)) 
       .addGroup(layout.createSequentialGroup() 
        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 74, Short.MAX_VALUE) 
        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING) 
         .addComponent(jTextField3, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) 
         .addComponent(jTextField2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)) 
        .addGap(30, 30, 30) 
        .addComponent(jLabel5) 
        .addGap(42, 42, 42)))) 
    ); 
    layout.setVerticalGroup(
     layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
     .addGroup(layout.createSequentialGroup() 
      .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING) 
       .addComponent(jButton1) 
       .addComponent(jLabel1)) 
      .addGap(20, 20, 20) 
      .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE) 
       .addComponent(jRadioButton1) 
       .addComponent(jRadioButton2)) 
      .addGap(21, 21, 21) 
      .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE) 
       .addComponent(jLabel2) 
       .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)) 
      .addGap(18, 18, 18) 
      .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE) 
       .addComponent(jLabel3) 
       .addComponent(jTextField2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) 
       .addComponent(jLabel5)) 
      .addGap(20, 20, 20) 
      .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE) 
       .addComponent(jLabel4) 
       .addComponent(jTextField3, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)) 
      .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 81, Short.MAX_VALUE) 
      .addComponent(jButton2) 
      .addContainerGap()) 
    ); 

    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(Add.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); 
    } catch (InstantiationException ex) { 
     java.util.logging.Logger.getLogger(Add.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); 
    } catch (IllegalAccessException ex) { 
     java.util.logging.Logger.getLogger(Add.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); 
    } catch (javax.swing.UnsupportedLookAndFeelException ex) { 
     java.util.logging.Logger.getLogger(Add.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 Add().setVisible(true); 
     } 
    }); 
} 
// Variables declaration - do not modify      
private javax.swing.JButton jButton1; 
private javax.swing.JButton jButton2; 
private javax.swing.JLabel jLabel1; 
private javax.swing.JLabel jLabel2; 
private javax.swing.JLabel jLabel3; 
private javax.swing.JLabel jLabel4; 
private javax.swing.JLabel jLabel5; 
private javax.swing.JRadioButton jRadioButton1; 
private javax.swing.JRadioButton jRadioButton2; 
private javax.swing.JTextField jTextField1; 
private javax.swing.JTextField jTextField2; 
private javax.swing.JTextField jTextField3; 
// End of variables declaration     
} 

Answer 1

更改私有可见市民在类中添加。