Question

我需要准备一个界面并使用可点击按钮来显示我们目前创建的所有不同窗口。

现在，我的团队成员为我们希望用户使用的每个窗口创建了多个JFrame。我们都在NetBeans IDE中工作。我正在尝试弹出一个登录窗口，从那里开始我会在点击一个按钮时显示所有窗口，这将导致用户进入该窗口。

以下是我们目前的情况：（主）

     import java.awt.*;
     import javax.swing.*;

    public class Corendon {

    public static void main(String[] args) {
           showLogin();
    }

    private static void showLogin(){
        Login login = new Login();

        login.setVisible(true);
        login.validate();
    }
}

用户请求的Login.java中的代码：

/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/

/**
*
* @author Daan
*/
public class Login extends javax.swing.JPanel {

/**
 * Creates new form Login
 */
public Login() {
    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();
    jLabel2 = new javax.swing.JLabel();
    jLabel3 = new javax.swing.JLabel();
    jPasswordField1 = new javax.swing.JPasswordField();
    jTextField1 = new javax.swing.JTextField();
    jComboBox1 = new javax.swing.JComboBox();
    jButton1 = new javax.swing.JButton();
    jButton2 = new javax.swing.JButton();

    jLabel1.setIcon(new    javax.swing.ImageIcon("C:\\Users\\Daan\\Dropbox\\HvA\\Programming\\Corendon\\corendon.png")); // NOI18N

    jLabel2.setText("Username");

    jLabel3.setText("Password");

    jComboBox1.setModel(new javax.swing.DefaultComboBoxModel(new String[] { "Dutch", "English" }));

    jButton1.setText("Login");
    jButton1.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            jButton1ActionPerformed(evt);
        }
    });

    jButton2.setText("Cancel");

    javax.swing.GroupLayout layout = new javax.swing.GroupLayout(this);
    this.setLayout(layout);
    layout.setHorizontalGroup(
        layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(layout.createSequentialGroup()
            .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
                .addGroup(javax.swing.GroupLayout.Alignment.LEADING, layout.createSequentialGroup()
                    .addGap(31, 31, 31)
                    .addComponent(jLabel1))
                .addGroup(javax.swing.GroupLayout.Alignment.LEADING, layout.createSequentialGroup()
                    .addGap(45, 45, 45)
                    .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                        .addComponent(jLabel2)
                        .addComponent(jLabel3)
                        .addComponent(jComboBox1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                    .addGap(14, 14, 14)
                    .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                        .addGroup(layout.createSequentialGroup()
                            .addGap(29, 29, 29)
                            .addComponent(jButton2)
                            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                            .addComponent(jButton1))
                        .addComponent(jPasswordField1, javax.swing.GroupLayout.PREFERRED_SIZE, 214, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, 214, javax.swing.GroupLayout.PREFERRED_SIZE))))
            .addContainerGap(22, Short.MAX_VALUE))
    );
    layout.setVerticalGroup(
        layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(layout.createSequentialGroup()
            .addContainerGap(16, Short.MAX_VALUE)
            .addComponent(jLabel1)
            .addGap(18, 18, 18)
            .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))
            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
            .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                .addComponent(jPasswordField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addComponent(jLabel3))
            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
            .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                .addComponent(jComboBox1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addComponent(jButton2)
                .addComponent(jButton1))
            .addGap(35, 35, 35))
    );
}// </editor-fold>                        

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
    // TODO add your handling code here:
}                                        

// Variables declaration - do not modify                     
private javax.swing.JButton jButton1;
private javax.swing.JButton jButton2;
private javax.swing.JComboBox jComboBox1;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JLabel jLabel3;
private javax.swing.JPasswordField jPasswordField1;
private javax.swing.JTextField jTextField1;
// End of variables declaration                   


}

正如您所看到的，当用户运行程序时，我正试图让Login窗口显示出来。但我目前正在处理的事实是，如果我将setVisible参数设置为true，它实际上并没有显示出来。该程序实际上只运行1秒而不是停止。

我有什么问题吗？同样在每个类中，我们还没有创建任何事件处理程序。它们只是具有多个组件的窗口。

Answer 1

JPanel需要包含在Window组件中，例如JFrame才能显示。

将showLogin方法替换为以下内容：

Login login = new Login();

JFrame frame = new JFrame();
frame.add(login);
frame.pack();
frame.setVisible(true);

JPanel没有显示

1 个答案: