我已经使用以下代码进行应用，但卡片背景并未显示白色，尽管我已经设置了它。任何人都能说出遗漏的东西吗？
package hospitalinfo;
import java.awt.CardLayout;
import javax.swing.ImageIcon;
public class PatientInfo extends javax.swing.JFrame {
/**
* Creates new form PatientInfo
*/
public PatientInfo() {
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.
*/
// <editor-fold defaultstate="collapsed" desc="Generated Code">//GENBEGIN:initComponents
private void initComponents() {
defaultUiPanel = new javax.swing.JPanel();
addPatient = new javax.swing.JButton();
addDoctor = new javax.swing.JButton();
cardsPanel = new javax.swing.JPanel();
patientCard = new javax.swing.JDesktopPane();
crlabel = new javax.swing.JLabel();
crvalue = new javax.swing.JLabel();
jLabel1 = new javax.swing.JLabel();
patientName = new javax.swing.JTextField();
relationSpecifier = new javax.swing.JComboBox();
relativeName = new javax.swing.JTextField();
agelabel = new javax.swing.JLabel();
doblabel = new javax.swing.JLabel();
jDateChooser1 = new com.toedter.calendar.JDateChooser();
doctorCard = new javax.swing.JDesktopPane();
jLabel2 = new javax.swing.JLabel();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
setTitle("Hospital Information System");
setBackground(new java.awt.Color(255, 255, 255));
setExtendedState(MAXIMIZED_BOTH);
setIconImage(new ImageIcon(getClass().getResource("/resources/hospital-icon.png")).getImage());
getContentPane().setLayout(new javax.swing.BoxLayout(getContentPane(), javax.swing.BoxLayout.X_AXIS));
defaultUiPanel.setBackground(new java.awt.Color(87, 196, 243));
defaultUiPanel.setPreferredSize(new java.awt.Dimension(400, 100));
addPatient.setIcon(new javax.swing.ImageIcon(getClass().getResource("/resources/user-icon.png"))); // NOI18N
addPatient.setText("Add Patient");
addPatient.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
addPatientActionPerformed(evt);
}
});
addDoctor.setIcon(new javax.swing.ImageIcon(getClass().getResource("/resources/People-Doctor-Male-icon.png"))); // NOI18N
addDoctor.setText("Add Doctor");
addDoctor.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
addDoctorActionPerformed(evt);
}
});
javax.swing.GroupLayout defaultUiPanelLayout = new javax.swing.GroupLayout(defaultUiPanel);
defaultUiPanel.setLayout(defaultUiPanelLayout);
defaultUiPanelLayout.setHorizontalGroup(
defaultUiPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(defaultUiPanelLayout.createSequentialGroup()
.addContainerGap()
.addGroup(defaultUiPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
.addComponent(addPatient, javax.swing.GroupLayout.DEFAULT_SIZE, 160, Short.MAX_VALUE)
.addComponent(addDoctor, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
.addContainerGap(214, Short.MAX_VALUE))
);
defaultUiPanelLayout.setVerticalGroup(
defaultUiPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(defaultUiPanelLayout.createSequentialGroup()
.addContainerGap()
.addComponent(addPatient)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(addDoctor)
.addContainerGap(182, Short.MAX_VALUE))
);
getContentPane().add(defaultUiPanel);
cardsPanel.setBackground(new java.awt.Color(255, 255, 255));
cardsPanel.setLayout(new java.awt.CardLayout());
patientCard.setBackground(new java.awt.Color(255, 255, 255));
patientCard.setBorder(javax.swing.BorderFactory.createTitledBorder(null, "Patient", javax.swing.border.TitledBorder.CENTER, javax.swing.border.TitledBorder.TOP, new java.awt.Font("Times New Roman", 0, 24), java.awt.Color.black)); // NOI18N
crlabel.setText("CR No");
patientCard.add(crlabel);
crlabel.setBounds(16, 41, 30, 14);
crvalue.setText("fd");
patientCard.add(crvalue);
crvalue.setBounds(69, 41, 14, 14);
jLabel1.setText("Name");
patientCard.add(jLabel1);
jLabel1.setBounds(16, 64, 27, 14);
patientCard.add(patientName);
patientName.setBounds(69, 61, 114, 20);
relationSpecifier.setModel(new javax.swing.DefaultComboBoxModel(new String[] { "S/o", "D/o", "W/o", "M/o", "F/o", "C/o" }));
relationSpecifier.setSelectedIndex(1);
patientCard.add(relationSpecifier);
relationSpecifier.setBounds(16, 87, 35, 20);
relativeName.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
relativeNameActionPerformed(evt);
}
});
patientCard.add(relativeName);
relativeName.setBounds(69, 87, 114, 20);
agelabel.setText("Age");
patientCard.add(agelabel);
agelabel.setBounds(164, 119, 19, 14);
doblabel.setText("D.O.B");
patientCard.add(doblabel);
doblabel.setBounds(16, 119, 29, 14);
patientCard.add(jDateChooser1);
jDateChooser1.setBounds(69, 113, 91, 20);
cardsPanel.add(patientCard, "patientcard");
doctorCard.setBackground(new java.awt.Color(255, 255, 255));
doctorCard.setBorder(javax.swing.BorderFactory.createTitledBorder(null, "Doctor ", javax.swing.border.TitledBorder.CENTER, javax.swing.border.TitledBorder.TOP, new java.awt.Font("Times New Roman", 0, 24), new java.awt.Color(0, 0, 0))); // NOI18N
jLabel2.setText("hello doctor");
javax.swing.GroupLayout doctorCardLayout = new javax.swing.GroupLayout(doctorCard);
doctorCard.setLayout(doctorCardLayout);
doctorCardLayout.setHorizontalGroup(
doctorCardLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(doctorCardLayout.createSequentialGroup()
.addGap(29, 29, 29)
.addComponent(jLabel2)
.addContainerGap(31, Short.MAX_VALUE))
);
doctorCardLayout.setVerticalGroup(
doctorCardLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(doctorCardLayout.createSequentialGroup()
.addContainerGap()
.addComponent(jLabel2)
.addContainerGap(224, Short.MAX_VALUE))
);
doctorCard.setLayer(jLabel2, javax.swing.JLayeredPane.DEFAULT_LAYER);
cardsPanel.add(doctorCard, "doctorcard");
getContentPane().add(cardsPanel);
pack();
}// </editor-fold>//GEN-END:initComponents
private void addPatientActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_addPatientActionPerformed
// TODO add your handling code here:
((CardLayout)(cardsPanel.getLayout())).show(cardsPanel, "patientcard");
}//GEN-LAST:event_addPatientActionPerformed
private void addDoctorActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_addDoctorActionPerformed
// TODO add your handling code here:
((CardLayout)(cardsPanel.getLayout())).show(cardsPanel, "doctorcard");
}//GEN-LAST:event_addDoctorActionPerformed
private void relativeNameActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_relativeNameActionPerformed
// TODO add your handling code here:
}//GEN-LAST:event_relativeNameActionPerformed
/**
* @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(PatientInfo.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(PatientInfo.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(PatientInfo.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(PatientInfo.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 PatientInfo().setVisible(true);
}
});
}
// Variables declaration - do not modify//GEN-BEGIN:variables
private javax.swing.JButton addDoctor;
private javax.swing.JButton addPatient;
private javax.swing.JLabel agelabel;
private javax.swing.JPanel cardsPanel;
private javax.swing.JLabel crlabel;
private javax.swing.JLabel crvalue;
private javax.swing.JPanel defaultUiPanel;
private javax.swing.JLabel doblabel;
private javax.swing.JDesktopPane doctorCard;
private com.toedter.calendar.JDateChooser jDateChooser1;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JDesktopPane patientCard;
private javax.swing.JTextField patientName;
private javax.swing.JComboBox relationSpecifier;
private javax.swing.JTextField relativeName;
// End of variables declaration//GEN-END:variables
}
答案 0 :(得分：0)
你在JDekstopPane上使用.setBackground是行不通的。在你的情况下，我认为patientCard和doctorCard默认面板颜色与cardsPanel重叠，因此你不会看到cardsPanel的白色背景。
如果您想知道如何更改JDesktopPane的背景颜色，可以看到答案here。