私は NetBeans プロジェクトを継承しましたが、これにも変更を加える必要があります。私は NetBeans の経験があまりなく、アプリケーションに問題があります。このアプリは基本的に、MySQL を使用してデータを保存および取得する出席システムです。私の問題は、Login.javaである初期ログインフォームから発生します。MySQL から取得した資格情報を介して正常にログインできます。しかし、ログインに成功すると、出力ウィンドウに一般的な「リンク エラー」が表示されますが、それ以上の説明はありません。これは、次のフォームをロードできなかったことを示す一般的なエラーですか? 実際の問題が何であるかについて、私は少し困惑しています。ログインが成功すると、Login.javaはAdmin_main.javaをロードする必要があります。これが 2 番目の形式です。ここで何が間違っているのか、誰かが光を当てることができますか? 助けていただければ幸いです!! エラーは私には意味がありません。よろしくお願いします！
更新 - 関連するコードは次のとおりです。このフォームが実行されるたびに、リンク エラーが生成されます。これ以上の情報はありません。かなり基本的な形です。私はそれを理解していません。
import java.awt.CardLayout;
import java.awt.Color;
import java.awt.Frame;
import java.awt.Toolkit;
import java.awt.image.BufferedImage;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.SwingUtilities;
public class stink_belt extends javax.swing.JFrame {
/**
* Creates new form stink_belt
*/
String adminid=null;
CardLayout card=new CardLayout();
skunk_ditch st=null;
stink_cell sub=null;
flush_rocket fac=null;
riggity_ras dept=null;
man_child user=null;
rocket_tail schedual=null;
Knocker_knot webcam=null;
PeeTomSue rptgn=null;
public stink_belt() {
initComponents();
panel_main.setLayout(card);
st=new skunk_ditch();
sub=new stink_cell();
fac=new flush_rocket();
dept=new riggity_ras();
user=new man_child();
schedual=new rocket_tail();
webcam=new Knocker_knot();
rptgn=new PeeTomSue();
panel_main.add(webcam,"Knocker_knot");
panel_main.add(rptgn,"PeeTomSue");
panel_main.add(st,"skunk_ditch");
panel_main.add(dept,"riggity_ras");
panel_main.add(fac,"flush_rocket");
panel_main.add(sub,"stink_cell");
panel_main.add(user,"man_child");
panel_main.add(schedual,"rocket_tail");
//new mainserver();
}
/**
* 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() {
panel_main = new javax.swing.JPanel();
jMenuBar1 = new javax.swing.JMenuBar();
dbmgmt = new javax.swing.JMenu();
studentmgmt = new javax.swing.JMenuItem();
submgmt = new javax.swing.JMenuItem();
facultymgmt = new javax.swing.JMenuItem();
deparmentmgmt = new javax.swing.JMenuItem();
usermanagement = new javax.swing.JMenuItem();
schedualmanagement = new javax.swing.JMenuItem();
webcams = new javax.swing.JMenu();
allwebcams = new javax.swing.JMenuItem();
jMenu1 = new javax.swing.JMenu();
aggregate_att = new javax.swing.JMenuItem();
jMenu2 = new javax.swing.JMenu();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
setTitle("Welcome");
setName("stink_belt"); // NOI18N
setPreferredSize(new java.awt.Dimension(930, 525));
addWindowFocusListener(new java.awt.event.WindowFocusListener() {
public void windowGainedFocus(java.awt.event.WindowEvent evt) {
formWindowGainedFocus(evt);
}
public void windowLostFocus(java.awt.event.WindowEvent evt) {
}
});
addWindowListener(new java.awt.event.WindowAdapter() {
public void windowOpened(java.awt.event.WindowEvent evt) {
formWindowOpened(evt);
}
});
panel_main.setPreferredSize(new java.awt.Dimension(930, 504));
javax.swing.GroupLayout panel_mainLayout = new javax.swing.GroupLayout(panel_main);
panel_main.setLayout(panel_mainLayout);
panel_mainLayout.setHorizontalGroup(
panel_mainLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 930, Short.MAX_VALUE)
);
panel_mainLayout.setVerticalGroup(
panel_mainLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 504, Short.MAX_VALUE)
);
dbmgmt.setText("Rocket Management");
studentmgmt.setText("Leper Management");
studentmgmt.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
studentmgmtActionPerformed(evt);
}
});
dbmgmt.add(kittymgmt);
submgmt.setText("Subject Management");
submgmt.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
submgmtActionPerformed(evt);
}
});
dbmgmt.add(rotmgmt);
facultymgmt.setText("Faculty Management");
facultymgmt.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
facultymgmtActionPerformed(evt);
}
});
dbmgmt.add(stinkmgmt);
deparmentmgmt.setText("Department Management");
deparmentmgmt.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
deparmentmgmtActionPerformed(evt);
}
});
dbmgmt.add(deparmentmgmt);
usermanagement.setText("User Management");
usermanagement.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
usermanagementActionPerformed(evt);
}
});
dbmgmt.add(usermanagement);
schedualmanagement.setText("Calendar Management");
schedualmanagement.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
schedualmanagementActionPerformed(evt);
}
});
dbmgmt.add(schedualmanagement);
jMenuBar1.add(dbmgmt);
webcams.setText("Knockers");
allwebcams.setText("All Webcams");
allwebcams.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
allwebcamsActionPerformed(evt);
}
});
webcams.add(allwebcams);
jMenuBar1.add(webcams);
jMenu1.setText("Report Generation");
aggregate_att.setText("Aggregate stink");
aggregate_att.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
aggregate_attActionPerformed(evt);
}
});
jMenu1.add(aggregate_att);
jMenuBar1.add(jMenu1);
jMenu2.setText("Change Password");
jMenu2.setHorizontalAlignment(javax.swing.SwingConstants.RIGHT);
jMenu2.setHorizontalTextPosition(javax.swing.SwingConstants.RIGHT);
jMenu2.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseClicked(java.awt.event.MouseEvent evt) {
jMenu2MouseClicked(evt);
}
});
jMenuBar1.add(jMenu2);
setJMenuBar(jMenuBar1);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(panel_main, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(panel_main, javax.swing.GroupLayout.DEFAULT_SIZE, 503, Short.MAX_VALUE)
);
panel_main.getAccessibleContext().setAccessibleName("");
panel_main.getAccessibleContext().setAccessibleDescription("");
getAccessibleContext().setAccessibleName("stink_belt");
pack();
}// </editor-fold>
private void studentmgmtActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
card.show(panel_main,"skunk_ditch");
panel_main.setSize(st.getPreferredSize());
this.setSize(panel_main.getSize().width+20,panel_main.getSize().height+60);
}
private void submgmtActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
card.show(panel_main,"stink_cell");
panel_main.setSize(sub.getPreferredSize());
this.setSize(panel_main.getSize().width+20,panel_main.getSize().height+60);
}
private void formWindowOpened(java.awt.event.WindowEvent evt) {
// TODO add your handling code here:
this.setLocationRelativeTo(null);
card.show(panel_main,"Knocker_knot");
panel_main.setSize(webcam.getPreferredSize());
this.setSize(this.getMaximumSize().width,this.getMaximumSize().height);
this.setExtendedState(JFrame.MAXIMIZED_BOTH);
this.getContentPane().setBackground(Color.WHITE);
SwingUtilities.updateComponentTreeUI(this);
}
private void facultymgmtActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
card.show(panel_main,"flush_rocket");
panel_main.setSize(fac.getPreferredSize());
this.setSize(panel_main.getSize().width+20,panel_main.getSize().height+60);
}
private void deparmentmgmtActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
card.show(panel_main,"riggity_ras");
panel_main.setSize(dept.getPreferredSize());
this.setSize(panel_main.getSize().width+50,panel_main.getSize().height+60);
}
private void usermanagementActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
card.show(panel_main,"man_child");
panel_main.setSize(user.getPreferredSize());
this.setSize(panel_main.getSize().width+70,panel_main.getSize().height+60);
}
private void schedualmanagementActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
card.show(panel_main,"rocket_tail");
panel_main.setSize(schedual.getPreferredSize());
this.setSize(panel_main.getSize().width+30,panel_main.getSize().height+60);
}
private void allwebcamsActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
card.show(panel_main,"Knocker_knot");
panel_main.setSize(webcam.getSize());
this.setSize(panel_main.getSize().width+30,panel_main.getSize().height+60);
this.setExtendedState(JFrame.MAXIMIZED_BOTH);
}
private void formWindowGainedFocus(java.awt.event.WindowEvent evt) {
// TODO add your handling code here:
}
private void aggregate_attActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
card.show(panel_main,"PeeTomSue");
panel_main.setSize(rptgn.getPreferredSize());
this.setSize(this.getMaximumSize().width,this.getMaximumSize().height);
this.setExtendedState(JFrame.MAXIMIZED_BOTH);
}
private void jMenu2MouseClicked(java.awt.event.MouseEvent evt) {
// TODO add your handling code here:
ChangePassword cp=new ChangePassword();
cp.txt_userid.setText(adminid);
cp.setVisible(true);
}
/**
* @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 | InstantiationException | IllegalAccessException | javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(stink_belt.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() {
new stink_belt().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JMenuItem aggregate_att;
private javax.swing.JMenuItem allwebcams;
private javax.swing.JMenu dbmgmt;
private javax.swing.JMenuItem deparmentmgmt;
private javax.swing.JMenuItem facultymgmt;
private javax.swing.JMenu jMenu1;
private javax.swing.JMenu jMenu2;
private javax.swing.JMenuBar jMenuBar1;
private javax.swing.JPanel panel_main;
private javax.swing.JMenuItem schedualmanagement;
private javax.swing.JMenuItem studentmgmt;
private javax.swing.JMenuItem submgmt;
private javax.swing.JMenuItem usermanagement;
private javax.swing.JMenu webcams;
エラー後の NetBeans のスクリーンショットを次に示します。リンク エラーは、実際には 94 や 111 などの run.xml を参照しています。
