Witam,
tak jak w temacie potrzebuje ubić panel obecnie istniejący i załadować nowy jak to zrobić?
Projekt tworzony w NeatBeansie..
pozdrawiam.
0
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JPanel dziedziczy po klasie Container - looknij w dokumentacje.
public void remove(Component comp)
Removes the specified component from this container.
lub jeśli nie masz tego obiektu w zmiennej
public void remove(int index)
Removes the component, specified by index, from this container.
dodawanie wykonujsze funkcja add.
0
Mógłbyś mi jeszcze coś wyjaśnić bo się pogubiłem?, zobacz:
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
/*
* NewJFrame.java
*
* Created on 2010-05-25, 21:59:50
*/
package javaapplication1;
import com.mysql.jdbc.PreparedStatement;
import javax.swing.JOptionPane;
import java.sql.*;
import javax.swing.JFrame;
import javax.swing.JPanel;
/**
*
* @author m.
*/
public class Main extends javax.swing.JFrame {
/** Creates new form NewJFrame */
public Main() {
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() {
textUsername = new javax.swing.JTextField();
textPassword = new javax.swing.JTextField();
logonButton = new javax.swing.JToggleButton();
jLabel1 = new javax.swing.JLabel();
jLabel2 = new javax.swing.JLabel();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
logonButton.setText("Logon");
logonButton.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
logonButtonActionPerformed(evt);
}
});
jLabel1.setText("Username:");
jLabel2.setText("Password:");
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(23, 23, 23)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jLabel2)
.addComponent(jLabel1))
.addGap(10, 10, 10)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
.addComponent(textUsername)
.addComponent(textPassword, javax.swing.GroupLayout.DEFAULT_SIZE, 130, Short.MAX_VALUE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(logonButton)
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(31, 31, 31)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel1)
.addComponent(textUsername, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel2)
.addComponent(textPassword, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(logonButton))
.addContainerGap(58, Short.MAX_VALUE))
);
pack();
}// </editor-fold>
private void logonButtonActionPerformed(java.awt.event.ActionEvent evt) {
String username, password;
username = textUsername.getText();
password = textPassword.getText();
if(username.length() <= 0)
JOptionPane.showMessageDialog(null, "Please enter a username");
else if (password.length() <= 0)
JOptionPane.showMessageDialog(null, "Please enter a password");
else
logon(username, password);
}
private int logon(String username, String password) {
Connection conn = null;
PreparedStatement stmt = null;
ResultSet rslt = null;
try
{
conn = DriverManager.getConnection("jdbc:mysql://127.0.0.1/test", "root", "test");
//stmt = conn.createStatement();
stmt = (PreparedStatement) conn.prepareStatement("SELECT * FROM users WHERE username = ? AND password = ?");
stmt.setString(1, username);
stmt.setString(2, password);
rslt = stmt.executeQuery();
if(rslt.next()) {
String resultUsername = rslt.getString("username");
String resultPassword = rslt.getString("password");
if(resultUsername.equals(username) && resultPassword.equals(password)) {
/*Niszczenie starej formy ładowanie nowej z pliku mess.java*/
}
}
}
catch (SQLException sqlEx)
{
System.out.println(sqlEx.getMessage());
//return;
}
finally
{
try
{
if (rslt != null)
{
rslt.close();
}
}
catch (Exception ex)
{
System.out.println("Error closing result set");
}
try
{
if (stmt != null)
{
stmt.close();
}
}
catch (Exception ex)
{
System.out.println("Error closing statement");
}
try
{
if (conn != null)
{
conn.close();
}
}
catch (Exception ex)
{
System.out.println("Error closing connection");
}
}
JOptionPane.showMessageDialog(null, username+" "+password);
return 1;
}
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new Main().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JToggleButton logonButton;
private javax.swing.JTextField textPassword;
private javax.swing.JTextField textUsername;
// End of variables declaration
}
Layout owej Formy jest wykreowany przez Edytor Wizualny zawarty w NetBeansie. I jak to jest teraz mogę tego używać czy owy wizerunek powinienem rzeźbić ręcznie (JFrame frame = new JFrame("xyz");)? aby cokolwiek zrobić ?
0
jeżeli chcesz używać wielu paneli dość przydatny jest manager java.awt.CardLayout;