以下是我创建的代码，用于尝试在GUI中创建包含我的房间预订的jTable。
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package displayrooms;
import java.beans.Statement;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.util.Vector;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.table.DefaultTableModel;
/**
*
* @author Mads
*/
public class DisplayRooms extends javax.swing.JFrame
{
/**
* Creates new form Displayrooms
*/
public DisplayRooms() throws ClassNotFoundException, SQLException
{
initComponents();
Class.forName("oracle.jdbc.driver.OracleDriver");
String stringCon = "jdbc:oracle:thin:@datdb.cphbusiness.dk:1521:dat;user;cphsh241;password;cphsh241";
Connection con = DriverManager.getConnection(stringCon);
java.sql.Statement state = con.createStatement();
ResultSet rs = state.executeQuery("SELECT * FROM Room_Booking");
ResultSetMetaData rsmetadata = rs.getMetaData();
int columns = rsmetadata.getColumnCount();
DefaultTableModel dtm = new DefaultTableModel();
Vector columns_name;
columns_name = new Vector();
Vector data_rows;
data_rows = new Vector();
for (int i = 1; i < columns; i++)
{
columns_name.addElement(rsmetadata.getColumnName(i));
}
dtm.setColumnIdentifiers(columns_name);
while (rs.next())
{
data_rows = new Vector();
for (int j = 1; j < columns; j++)
{
data_rows.addElement(rs.getString(j));
}
dtm.addRow(data_rows);
}
jTable1.setModel(dtm);
}
/**
* 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();
jScrollPane1 = new javax.swing.JScrollPane();
jTable1 = new javax.swing.JTable();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jLabel1.setText("Rooms");
jTable1.setModel(new javax.swing.table.DefaultTableModel(
new Object [][]
{
{null, null, null, null},
{null, null, null, null},
{null, null, null, null},
{null, null, null, null}
},
new String []
{
"Title 1", "Title 2", "Title 3", "Title 4"
}
));
jScrollPane1.setViewportView(jTable1);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(173, 173, 173)
.addComponent(jLabel1)
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addContainerGap(15, Short.MAX_VALUE)
.addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 375, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap())
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(jLabel1)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 275, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, 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(DisplayRooms.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex)
{
java.util.logging.Logger.getLogger(DisplayRooms.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex)
{
java.util.logging.Logger.getLogger(DisplayRooms.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex)
{
java.util.logging.Logger.getLogger(DisplayRooms.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable()
{
@Override
public void run()
{
try
{
new DisplayRooms().setVisible(true);
} catch (ClassNotFoundException | SQLException ex)
{
Logger.getLogger(DisplayRooms.class.getName()).log(Level.SEVERE, null, ex);
}
}
});
}
// Variables declaration - do not modify
private javax.swing.JLabel jLabel1;
private javax.swing.JScrollPane jScrollPane1;
private javax.swing.JTable jTable1;
// End of variables declaration
}
问题1
当我运行它时，我收到的错误是：
＆＃34;错误：无法找到或加载主类陈列室。显示房间 Java结果：1＆＃34;
我尝试使用Google搜索并查看YouTube视频，但所有解决方案似乎都无法用于我的项目。
有谁知道造成这个问题的原因是什么？
我还有一个跟进问题，如果项目实际上应该能够运行，但我需要先运行它。