我必须能够将order（label）的内容写到在桌面上输出的文本文件中，我有一个按钮可以将菜单保存在菜单栏上，但是不知道如何添加功能。
这是我为主要课程准备的完整代码，如果有什么我可以做的来改善代码的其他部分，请在我还在学习的同时也说
import java.awt.event.*;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;
import javax.swing.JOptionPane;
import javax.swing.JFrame;
/**
*
* @author
*/
public class Main extends javax.swing.JFrame {
private javax.swing.JButton addDrinkButton;
private javax.swing.JButton addSandwichButton;
private javax.swing.JButton addSideButton;
//private javax.swing.JButton addNewDrinkButton;
//private javax.swing.JButton addNewSandwichButton;
//private javax.swing.JButton addNewSideButton;
private javax.swing.JButton quitButton;
private javax.swing.JComboBox<String> drinkComboBox;
private javax.swing.JLabel drinkLabel;
private javax.swing.JButton editOrderButton;
private javax.swing.JMenu JMenuVar;
private javax.swing.JMenuBar jMenuBar1;
private javax.swing.JScrollPane jScrollPane2;
private javax.swing.JMenuItem loadMenu;
private javax.swing.JTextPane orderDisplay;
//private javax.swing.JMenuItem quitMenuOption;
private javax.swing.JComboBox<String> sandwichComboBox;
private javax.swing.JLabel sandwichLabel;
private javax.swing.JMenuItem saveMenuOption;
private javax.swing.JComboBox<String> sideComboBox;
private javax.swing.JLabel sideLabel;
private javax.swing.JButton sortByNameButton;
private javax.swing.JButton sortByPriceButton;
private javax.swing.JButton startOrderButton;
private Menu sandwichMenu = new Menu("Our Sandwiches");
private Menu sideMenu = new Menu("Our Sides");
private Menu drinkMenu = new Menu("Our Drinks");
private Order order;
public Main() {
initComponents();
initMenus();
addEventListeners();
}
private void initMenus() {
//Initialise sandwich menu object
Sandwich sandwich = new Sandwich("BLT", 275, "Bacon, Lettuce and Tomato", Bread.WHITE);
sandwichMenu.addMenuItem(sandwich);
sandwich = new Sandwich("Pastrami", 250, "Pastrami and Mustard", Bread.RYE);
sandwichMenu.addMenuItem(sandwich);
sandwich = new Sandwich("Veggie", 300, "Veggie Ham and Salad", Bread.WHOLEMEAL);
sandwichMenu.addMenuItem(sandwich);
sandwich = new Sandwich("Cheese Bagel", 400, "Cream Cheese Bagel", Bread.BAGEL);
sandwichMenu.addMenuItem(sandwich);
sandwich = new Sandwich("Greek Salad Pita", 400, "Salad filled Pita", Bread.PITA);
sandwichMenu.addMenuItem(sandwich);
sandwichComboBox.setModel(new javax.swing.DefaultComboBoxModel(sandwichMenu.getItems().toArray()));
//Initialise drink menu object
Drink drink = new Drink("Irn Bru", 100 ,false);
drinkMenu.addMenuItem(drink);
drink = new Drink("Beer", 350, true);
drinkMenu.addMenuItem(drink);
drink = new Drink("Water", 60, false);
drinkMenu.addMenuItem(drink);
drink = new Drink("Juice", 70, false);
drinkMenu.addMenuItem(drink);
drink = new Drink("Cider", 350, true);
drinkMenu.addMenuItem(drink);
drinkComboBox.setModel(new javax.swing.DefaultComboBoxModel(drinkMenu.getItems().toArray()));
//Initialise side menu
Side side = new Side("Chips", 120);
sideMenu.addMenuItem(side);
side = new Side("Chips with Sauce", 120, "Mustard or Ketchup");
sideMenu.addMenuItem(side);
side = new Side("Salad", 100);
sideMenu.addMenuItem(side);
side = new Side("Hot Dog", 250);
sideMenu.addMenuItem(side);
side = new Side("Hot Dog with Sauce", 250, "Mustard or Ketchup");
sideMenu.addMenuItem(side);
sideComboBox.setModel(new javax.swing.DefaultComboBoxModel(sideMenu.getItems().toArray()));
}
private void initComponents() {
this.setTitle("Sandwich Shop");
quitButton = new javax.swing.JButton();
startOrderButton = new javax.swing.JButton();
sandwichComboBox = new javax.swing.JComboBox<>();
sandwichLabel = new javax.swing.JLabel();
drinkComboBox = new javax.swing.JComboBox<>();
drinkLabel = new javax.swing.JLabel();
sideComboBox = new javax.swing.JComboBox<>();
sideLabel = new javax.swing.JLabel();
jScrollPane2 = new javax.swing.JScrollPane();
orderDisplay = new javax.swing.JTextPane();
addSandwichButton = new javax.swing.JButton();
addDrinkButton = new javax.swing.JButton();
addSideButton = new javax.swing.JButton();
//addNewSandwichButton = new javax.swing.JButton();
//addNewDrinkButton = new javax.swing.JButton();
//addNewSideButton = new javax.swing.JButton();
sortByPriceButton = new javax.swing.JButton();
sortByNameButton = new javax.swing.JButton();
editOrderButton = new javax.swing.JButton();
jMenuBar1 = new javax.swing.JMenuBar();
JMenuVar = new javax.swing.JMenu();
saveMenuOption = new javax.swing.JMenuItem();
loadMenu = new javax.swing.JMenuItem();
//quitMenuOption = new javax.swing.JMenuItem();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
startOrderButton.setText("Start Order");
sandwichComboBox.setModel(new javax.swing.DefaultComboBoxModel<>(new String[] { "Item 1", "Item 2", "Item 3", "Item 4" }));
sandwichLabel.setText("Sandwiches");
drinkComboBox.setModel(new javax.swing.DefaultComboBoxModel<>(new String[] { "Item 1", "Item 2", "Item 3", "Item 4", "Item 5" }));
drinkLabel.setText("Drinks");
sideComboBox.setModel(new javax.swing.DefaultComboBoxModel<>(new String[] { "Item 1", "Item 2", "Item 3", "Item 4", "Item 5" }));
sideLabel.setText("Sides");
quitButton.setText("Quit Program");
jScrollPane2.setViewportView(orderDisplay);
addSandwichButton.setText("Add Sandwich to order");
addDrinkButton.setText("Add Drink to order");
addSideButton.setText("Add Side to order");
//addNewSandwichButton.setText("Add a new sandwich");
//addNewDrinkButton.setText("Add a new drink");
//addNewSideButton.setText("Add a new side");
sortByPriceButton.setText("Sort menus by price");
sortByNameButton.setText("Sort menus by name");
editOrderButton.setText("Edit Current Order");
JMenuVar.setText("File");
saveMenuOption.setText("Save Menu");
JMenuVar.add(saveMenuOption);
loadMenu.setText("Load new menu");
JMenuVar.add(loadMenu);
//quitMenuOption.setText("Quit");
// JMenuVar.add(quitMenuOption);
jMenuBar1.add(JMenuVar);
setJMenuBar(jMenuBar1);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(startOrderButton)
.addComponent(editOrderButton))
.addGap(18, 18, 18)
.addComponent(sandwichLabel)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(sandwichComboBox, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(addSandwichButton)))
.addGap(11, 11, 11)
.addComponent(drinkLabel)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(drinkComboBox, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(addDrinkButton)))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(sideLabel)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(sideComboBox, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(addSideButton)))
.addGap(5, 5, 5)
.addComponent(sortByNameButton)
.addComponent(sortByPriceButton)
.addComponent(quitButton)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGap(0, 10, Short.MAX_VALUE))
.addComponent(jScrollPane2))
.addContainerGap())
);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(drinkComboBox, 0, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(sideComboBox, 0, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(sandwichLabel)
.addComponent(drinkLabel)
.addComponent(sideLabel))
.addGap(3, 3, Short.MAX_VALUE))
.addComponent(sandwichComboBox, 5, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
.addGroup(layout.createSequentialGroup()
.addComponent(addSandwichButton)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED))
.addGroup(layout.createSequentialGroup()
.addComponent(addSideButton)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED))
.addGroup(layout.createSequentialGroup()
.addComponent(addDrinkButton)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)))
.addGap(18, 18, 18))
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false)
.addComponent(sortByNameButton, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(sortByPriceButton, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(quitButton, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
.addGap(0, 0, Short.MAX_VALUE))))
.addGroup(layout.createSequentialGroup()
.addGap(94, 94, 94)
.addComponent(startOrderButton, javax.swing.GroupLayout.PREFERRED_SIZE, 120, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(editOrderButton, javax.swing.GroupLayout.PREFERRED_SIZE, 130, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 125, Short.MAX_VALUE)))
.addComponent(jScrollPane2, javax.swing.GroupLayout.PREFERRED_SIZE, 326, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap())
);
pack();
}
private void addEventListeners() {
addSandwichButton.addActionListener(evt -> addSandwichButtonEvent(evt));
addSideButton.addActionListener(evt -> addSideButtonActionPerformed(evt));
addDrinkButton.addActionListener(evt -> addDrinkButtonEvent(evt));
startOrderButton.addActionListener(evt -> startNewOrder());
//quitMenuOption.addActionListener(evt -> System.exit(0));
quitButton.addActionListener(evt -> System.exit(0));
sortByNameButton.addActionListener(evt -> sortMenusByName());
sortByPriceButton.addActionListener(evt -> sortMenusByPrice());
}
private void sortMenusByPrice() {
sandwichMenu.sortItemsByPrice();
sideMenu.sortItemsByPrice();
drinkMenu.sortItemsByPrice();
resetComboBoxes();
}
private void sortMenusByName() {
sandwichMenu.sortItemsByTitle();
sideMenu.sortItemsByTitle();
drinkMenu.sortItemsByTitle();
resetComboBoxes();
}
private void resetComboBoxes() {
sandwichComboBox.setModel(new javax.swing.DefaultComboBoxModel(sandwichMenu.getItems().toArray()));
drinkComboBox.setModel(new javax.swing.DefaultComboBoxModel(drinkMenu.getItems().toArray()));
sideComboBox.setModel(new javax.swing.DefaultComboBoxModel(sideMenu.getItems().toArray()));
}
private void addSandwichButtonEvent(ActionEvent evt) {
if(order != null) {
order.addMenuItem((MenuItem) sandwichComboBox.getSelectedItem());
updateOrder();
} else {
JOptionPane.showMessageDialog(null, "Please start an order before adding items");
return;
}
}
private void addDrinkButtonEvent(ActionEvent evt) {
if(order != null) {
Drink receivedItem = (Drink) drinkComboBox.getSelectedItem();
if(receivedItem.hasAlcohol()) {
int r = JOptionPane.showConfirmDialog(null, "Are you over 18?", null, JOptionPane.YES_NO_OPTION);
if(r == JOptionPane.NO_OPTION) {
return;
} else {
order.addMenuItem(receivedItem);
}
} else {
order.addMenuItem(receivedItem);
}
updateOrder();
} else {
JOptionPane.showMessageDialog(null, "Please click start order before adding items");
return;
}
}
private void addSideButtonActionPerformed(ActionEvent evt) {
if(order != null) {
order.addMenuItem((MenuItem) sideComboBox.getSelectedItem());
updateOrder();
} else {
JOptionPane.showMessageDialog(null, "Please click start order before adding items");
return;
}
}
private void startNewOrder() {
if(order == null) {
String name = JOptionPane.showInputDialog(null,"Please enter customers name: ",null);
System.out.println(name);
int i = 0;
while (name == "null" && i < 3) {
int attempts = 3 - i;
name = JOptionPane.showInputDialog(null,"Please click start order before adding items " + attempts + " remaining",null);
i++;
} if (name == "null") {
return;
} else {
order = new Order(name);
updateOrder();
}
} else {
int r = (int) JOptionPane.showConfirmDialog(null, "Are you sure you want to start a new Order? Your current order will be lost!", null, JOptionPane.YES_NO_OPTION);
System.out.println(r);
if(r == JOptionPane.YES_OPTION){
String name = JOptionPane.showInputDialog(null,"please enter the customer's name",null);
System.out.println(name);
int i = 0;
while (name == "null" && i < 3){
int attempts = 3 - i;
name = JOptionPane.showInputDialog(null,"please enter the customer's name you have " + attempts +" remaining",null);
i++;
} if (name == "null"){
return;
} else {
order = new Order(name);
updateOrder();
}
} else {
return;
}
}
}
private void updateOrder() {
String orderString = order.getCustomer() + "'s Order (order id " + order.getOrderID() + "):\n\n";
int price = 0;
ArrayList<MenuItem> items = order.getItems();
for(MenuItem item : items){
orderString += item.toString()+"\n";
price += item.price();
}
orderString += "\nprice: " + price + "p";
orderDisplay.setText(orderString);
}
public static void main(String args[]) {
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(Main.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(Main.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(Main.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(Main.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new Main().setVisible(true);
}
});
}
}