Es läuft in Ordnung, aber meine Listen werden überhaupt nicht gedruckt. Außerdem, wo sollte ich die Konvertierung in Kleinbuchstaben für meine Listen hinzufügen? Und ich muss auch die weißen Felder vor oder nach den Listen trimmen, welche Methode ist das Beste?Wie kommt es, dass meine Listen nicht gedruckt werden, wenn ich das Programm starte?
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.lang.*;
public class ShoppingList extends JFrame {
private JPanel groceryPanel;
private JPanel selectedGroceryPanel;
private JPanel buttonPanel;
private JList groceryList;
private JList selectedGroceryList;
private JLabel label;
private JTextField selectedGroceryItem;
private JButton button1;
private JButton button2;
private JButton button3;
private JButton button4;
private String[] lists = { "Burger Patty", "Honey Ham", "Milk",
"Egg", "Orange Juice", "Ketchup", "Lettuce",
"Hamburger Buns", "Tomatoes", "Cheese"
};
//ctor
public ShoppingList() {
setTitle("Shopping List");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLayout(new BorderLayout());
buildGroceryPanel();
buildSelectedGroceryPanel();
buildButtonPanel();
add(groceryPanel, BorderLayout.NORTH);
add(selectedGroceryPanel, BorderLayout.CENTER);
add(buttonPanel, BorderLayout.SOUTH);
pack();
setVisible(true);
}//end ctor
private void buildGroceryPanel() {
groceryPanel = new JPanel();
groceryList = new JList(lists);
groceryList.setSelectionMode(
ListSelectionModel.MULTIPLE_INTERVAL_SELECTION);
}//end buildGroceryPanel
private void buildSelectedGroceryPanel() {
selectedGroceryPanel = new JPanel();
label = new JLabel("You selected: ");
selectedGroceryList = new JList();
selectedGroceryItem = new JTextField(10);
selectedGroceryItem.setEditable(false);
selectedGroceryPanel.add(label);
selectedGroceryPanel.add(selectedGroceryItem);
}//end buildSelectedGroceryPanel
private void buildButtonPanel() {
buttonPanel = new JPanel();
button1 = new JButton("ADD");
button2 = new JButton("REMOVE");
button3 = new JButton("SAVE");
button4 = new JButton("LOAD");
button1.addActionListener(new ButtonListener());
button2.addActionListener(new ButtonListener());
button3.addActionListener(new ButtonListener());
button4.addActionListener(new ButtonListener());
buttonPanel.add(button1);
buttonPanel.add(button2);
buttonPanel.add(button3);
buttonPanel.add(button4);
}//end buildButtonPanel
private class ButtonListener
implements ActionListener {
public void actionPerformed(ActionEvent e) {
Object[] selections =
groceryList.getSelectedValues();
selectedGroceryList.setListData(selections);
}
}
public static void main(String[] args) {
new ShoppingList();
}//end main
}
Wo drucken Sie? – shmosel