我正在使用 Netbeans 7.3 Beta 2 GUI 构建器。编写一个 Swing GUI 代码,一旦按下按钮,我正在尝试显示另一个 GUI。
private void loginButtonSceneActionPerformed(java.awt.event.ActionEvent evt) {
new LoginGUI();
}
按下登录按钮后,我想显示 LoginGUI,但它什么也不做,Netbeans 指出"忽略新实例"。我在按钮上添加了一个system.out.println,以确保它工作正常并且确实如此。
这里或多或少是完整的来源。我哪里出错了?我想将此 GUI 替换为登录 GUI。
package com.john.spp.view;
import java.sql.ResultSet;
import java.sql.Statement;
/**
*
* @author John
*/
public class LogRegGUI extends javax.swing.JFrame {
/**
* Creates new form LoginGUI
*/
public LogRegGUI() {
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() {
//GUI BUILDER CODE HERE
}// </editor-fold>
private void loginButtonSceneActionPerformed(java.awt.event.ActionEvent evt) {
new LoginGUI();
}
private void registerSceneButtonActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
}
/**
* @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(LogRegGUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(LogRegGUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(LogRegGUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(LogRegGUI.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 LogRegGUI().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JButton dataVaultButton;
private javax.swing.JButton helpButton;
private javax.swing.JEditorPane jEditorPane1;
private javax.swing.JLabel jLabel3;
private javax.swing.JPanel jPanel1;
private javax.swing.JPanel jPanel2;
private javax.swing.JScrollPane jScrollPane1;
private javax.swing.JButton loginButton;
private javax.swing.JButton logoutButton;
private javax.swing.JButton registerButton;
private javax.swing.JButton settingsButton;
// End of variables declaration
}
谢谢。
编辑:
使用此代码修复了它,但它看起来很糟糕,因为它闪烁得很快并重新绘制新的 GUI,关于如何阻止它的任何想法?
private void loginButtonSceneActionPerformed(java.awt.event.ActionEvent evt) {
LoginGUI itemloader=new LoginGUI();
itemloader.setVisible(true);
this.setVisible(false);
}
有几个原因导致使用多个帧不是应用程序的最佳解决方案。好吧,它通常会让用户感到困惑,并且如您所见,会带来一些并发症。
正如我在评论中已经建议的那样,您可以在展示之前构建所有JFrame
,让您以我昨天的另一个答案为指导。如果将它们设置为可见,则不会像现在这样有那么多延迟,还可以节省一些内存和 CPU 时间。
另一种方法可能是只使用一个帧并更改其内容。这个答案真的成长为我最喜欢的参考;)
这样,还可以先构建,然后立即显示您已经构建的内容。没有延迟,没有闪烁。