我正在构建一个applet来更改jPanel的颜色，但是我很难让我的值显示在JList窗口中。 我知道有些人不喜欢NetBeans，但我们需要使用它。
这是我现在的代码
MainWindow.java
package ColorChanger;
import ColorMap.ColorMap;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.Vector;
import javax.swing.DefaultListModel;
import javax.swing.JFrame;
import javax.swing.JList;
/**
*
* @author
*/
public class MainWindow extends javax.swing.JFrame {
/**
* Creates new form MainWindow
*/
public MainWindow() {
initComponents();
pGUI();
}
/**
* 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() {
jPanel1 = new javax.swing.JPanel();
lbl_Title = new javax.swing.JLabel();
lbl_instruct = new javax.swing.JLabel();
jScrollPane1 = new javax.swing.JScrollPane();
jl_HT = ShowList();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
lbl_Title.setText("Color Changer");
lbl_instruct.setText("Select A Color:");
jl_HT.setModel(new DefaultListModel());
jl_HT.setSelectionMode(javax.swing.ListSelectionModel.SINGLE_SELECTION);
jScrollPane1.setViewportView(jl_HT);
javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
jPanel1.setLayout(jPanel1Layout);
jPanel1Layout.setHorizontalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addContainerGap()
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addComponent(lbl_instruct, javax.swing.GroupLayout.PREFERRED_SIZE, 87, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 111, javax.swing.GroupLayout.PREFERRED_SIZE))
.addComponent(lbl_Title))
.addContainerGap(168, Short.MAX_VALUE))
);
jPanel1Layout.setVerticalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addComponent(lbl_Title)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(lbl_instruct, javax.swing.GroupLayout.PREFERRED_SIZE, 21, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)))
);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addContainerGap())
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(108, Short.MAX_VALUE))
);
pack();
}// </editor-fold>
private void pGUI() {
JFrame mainFrame = new JFrame("Select a color to change background");
mainFrame.addWindowListener(new WindowAdapter() {
public void windowsClosing(WindowEvent windowevent) {
System.exit(0);
}
});
}
/**
* @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(MainWindow.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(MainWindow.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(MainWindow.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(MainWindow.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
/*
set Hashtable from ColorMap Package.
*/
/* Create and display the form */
java.awt.EventQueue.invokeLater(() -> {
new MainWindow().setVisible(true);
});
}
public JList ShowList() {
JList jListO = null;
JList jList = new JList();
Hashtable ht = new Hashtable();
ht.putAll(ColorMap.hColorMap);
JList jlist = new JList(new Vector(ht.keySet()));
DefaultListModel dlm = (DefaultListModel)jlist.getModel();
Enumeration e = dlm.elements();
while (e.hasMoreElements()) {
jListO = (JList) e.nextElement();
}
return jListO;
}
// Variables declaration - do not modify
private javax.swing.JPanel jPanel1;
private javax.swing.JScrollPane jScrollPane1;
public javax.swing.JList<JList> jl_HT;
private javax.swing.JLabel lbl_Title;
private javax.swing.JLabel lbl_instruct;
// End of variables declaration
}
这是构建HashMap的ColorMap包。 ColorMap.java
package ColorMap;
import java.awt.Color;
import java.util.HashMap;
/**
*
* @author
*/
public class ColorMap {
/*
Creating the HashMap of Colors
*/
public static HashMap<String, Color> hColorMap = new HashMap<>();
/*
Populating the HashMap with the index and colors
*/
public ColorMap() {
hColorMap.put("Black", Color.BLACK);
hColorMap.put("Blue", Color.BLUE);
hColorMap.put("Cyan", Color.CYAN);
hColorMap.put("Dark Gray", Color.DARK_GRAY);
hColorMap.put("Gray", Color.GRAY);
hColorMap.put("Green", Color.GREEN);
hColorMap.put("Light Gray", Color.LIGHT_GRAY);
hColorMap.put("Magenta", Color.MAGENTA);
hColorMap.put("Orange", Color.ORANGE);
hColorMap.put("Pink", Color.PINK);
hColorMap.put("Red", Color.RED);
hColorMap.put("White", Color.WHITE);
hColorMap.put("Yellow", Color.YELLOW);
}
private String getName(Color color) {
return color.getClass().getName();
}
public HashMap<String, Color> getColor() {
return hColorMap;
}
}
我遇到的问题是从HashMap中获取名称以显示在JList中