java Swing、类和Netbeans
这对你来说可能是个愚蠢的问题，但我对这一切都不熟悉。所以我正在用java编写一个测验应用程序，到目前为止我只有一个问题。它不应该是一个成熟的应用程序，它只是我为一个项目所做的事情
所以我有这门课，这是第一个问题，完成了设计和所有这些。提交答案后，它会被发送到我从pMA访问的本地数据库。到现在为止，一直都还不错。问题是，一个测验应该有不止一个问题。问题是，我不知道如何修改我的gui或类来实现这一点。理想情况下，我会让“提交”按钮将答案提交给db并转到下一个问题，除非我不知道如何添加一个问题，并让我的gui显示在同一个jpane中，而不是第一个问题。 我是要为每一个问题在程序包中单独设置一个类，并以某种方式将它们连接起来，还是什么
我应该指出，我只懂一点点java，所以给出大多数人都清楚的模糊答案可能对我来说并不清楚。谢谢你的耐心
所有这些都是在Netbeans gui builder中完成的，这意味着我无法编辑大部分代码，所以理想情况下，我只需复制粘贴此内容并更改其他问题的值
第一个问题的代码如下：
package quiz;
import java.awt.HeadlessException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import javax.swing.JOptionPane;
public class NewJFrame extends javax.swing.JFrame {
Connection con = null;
PreparedStatement pst=null;
ResultSet rs=null;
Statement st;
String value;
public NewJFrame() {
initComponents();
}
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
buttonGroup1 = new javax.swing.ButtonGroup();
jLabel1 = new javax.swing.JLabel();
jRadioButton1 = new javax.swing.JRadioButton();
jRadioButton2 = new javax.swing.JRadioButton();
jRadioButton3 = new javax.swing.JRadioButton();
jRadioButton4 = new javax.swing.JRadioButton();
jButton1 = new javax.swing.JButton();
jPanel1 = new javax.swing.JPanel();
jLabel2 = new javax.swing.JLabel();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jLabel1.setFont(new java.awt.Font("Tahoma", 0, 18)); // NOI18N
jLabel1.setText("Koja je visina Mont Everesta?");
jRadioButton1.setText("8848 metara");
jRadioButton1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jRadioButton1ActionPerformed(evt);
}
});
jRadioButton2.setText("9848 metara");
jRadioButton2.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jRadioButton2ActionPerformed(evt);
}
});
jRadioButton3.setText("10848 metara");
jRadioButton3.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jRadioButton3ActionPerformed(evt);
}
});
jRadioButton4.setText("11848 metara");
jRadioButton4.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jRadioButton4ActionPerformed(evt);
}
});
jButton1.setText("Dalje");
jButton1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton1ActionPerformed(evt);
}
});
jLabel2.setIcon(new javax.swing.ImageIcon(getClass().getResource("/quiz/mountain.png"))); // NOI18N
javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
jPanel1.setLayout(jPanel1Layout);
jPanel1Layout.setHorizontalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addContainerGap()
.addComponent(jLabel2, javax.swing.GroupLayout.DEFAULT_SIZE, 294, Short.MAX_VALUE)
.addContainerGap())
);
jPanel1Layout.setVerticalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addComponent(jLabel2, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addContainerGap())
);
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()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jRadioButton4)
.addComponent(jRadioButton3)
.addComponent(jRadioButton2)
.addComponent(jRadioButton1))
.addGap(124, 124, 124))
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addGap(0, 0, Short.MAX_VALUE)
.addComponent(jButton1)
.addContainerGap())))
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jLabel1)
.addGap(100, 100, 100))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(jLabel1)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(18, 18, 18)
.addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(layout.createSequentialGroup()
.addGap(57, 57, 57)
.addComponent(jRadioButton1)
.addGap(18, 18, 18)
.addComponent(jRadioButton2)
.addGap(18, 18, 18)
.addComponent(jRadioButton3)
.addGap(18, 18, 18)
.addComponent(jRadioButton4)))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jButton1)
.addContainerGap())
);
pack();
}// </editor-fold>
//auto generated gui above
private void jRadioButton1ActionPerformed(java.awt.event.ActionEvent evt) {
value="8848";
}
private void jRadioButton2ActionPerformed(java.awt.event.ActionEvent evt) {
value="9848";
}
private void jRadioButton3ActionPerformed(java.awt.event.ActionEvent evt) {
value="10848";
}
private void jRadioButton4ActionPerformed(java.awt.event.ActionEvent evt) {
value="11848";
}
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
try{
String submitQuery="INSERT INTO uneseniodgovori(uo) VALUES (?)";
con=DriverManager.getConnection("jdbc:mysql://localhost/javaquiz", "root", "");
pst=con.prepareStatement(submitQuery);
pst.setString(1, value);
pst.executeUpdate();
JOptionPane.showMessageDialog(this,"Vas odgovor je postavljen uspjesno!");
String extractQuery="select uneseniodgovori.uo, odgovori.odg from odgovori inner join(select uo from uneseniodgovori order by id desc limit 1) as uneseniodgovori on uneseniodgovori.uo=odgovori.odg";
pst=con.prepareStatement(extractQuery);
rs=pst.executeQuery();
if(rs.next()){
String valueQuery="INSERT INTO uporedi(vrijednost) VALUES(?)";
pst=con.prepareStatement(valueQuery);
pst.setString(1, "Tacno!");
pst.executeUpdate();
}
else{
String valueQuery="INSERT INTO uporedi(vrijednost) VALUES (?)";
pst=con.prepareStatement(valueQuery);
pst.setString(1, "Netacno!");
pst.executeUpdate();
}
}
catch(SQLException | HeadlessException ex){
JOptionPane.showMessageDialog(this, ex.getMessage());
}
}
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(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(NewJFrame.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 NewJFrame().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.ButtonGroup buttonGroup1;
private javax.swing.JButton jButton1;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JPanel jPanel1;
private javax.swing.JRadioButton jRadioButton1;
private javax.swing.JRadioButton jRadioButton2;
private javax.swing.JRadioButton jRadioButton3;
private javax.swing.JRadioButton jRadioButton4;
// End of variables declaration
}
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