我正在一个我们有电话簿程序的实验室工作。程序打开一个框，然后打开一个包含名称和数字列表的.bat文件。
我无法弄清楚如何让我的deleteMI函数和searchMI函数工作。
非常感谢任何帮助
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import javax.swing.JOptionPane;
public class PhoneBook extends Frame implements ActionListener, ItemListener {
MenuItem newMI, openMI, saveMI, saveAsMI, exitMI;
MenuItem searchMI, deleteMI, updateMI, newEntryMI, sortMI;
String fileName;
List nameList, numberList;
TextField lastName, firstName, phoneNumber;
/**
* Constructor
*/
public PhoneBook() {
super("White Pages"); // set frame title
setLayout(new BorderLayout()); // set layout
// create menu bar
MenuBar menubar = new MenuBar();
setMenuBar(menubar);
// create file menu
Menu fileMenu = new Menu("File");
menubar.add(fileMenu);
newMI = fileMenu.add(new MenuItem("New"));
newMI.addActionListener(this);
openMI = fileMenu.add(new MenuItem("Open"));
openMI.addActionListener(this);
fileMenu.addSeparator();
saveMI = fileMenu.add(new MenuItem("Save"));
saveAsMI = fileMenu.add(new MenuItem("Save As ..."));
fileMenu.addSeparator();
exitMI = fileMenu.add(new MenuItem("Exit"));
exitMI.addActionListener(this);
// create edit menu
Menu editMenu = new Menu("Edit");
menubar.add(editMenu);
updateMI = editMenu.add(new MenuItem("Update"));
updateMI.addActionListener(this);
newEntryMI = editMenu.add(new MenuItem("New Entry"));
newEntryMI.addActionListener(this);
deleteMI = editMenu.add(new MenuItem("Delete"));
editMenu.addSeparator();
searchMI = editMenu.add(new MenuItem("Search"));
searchMI.addActionListener(this);
sortMI = editMenu.add(new MenuItem("Sort"));
// create phone list and controls
Panel listPanel = new Panel(new BorderLayout());
add(listPanel, BorderLayout.CENTER);
Label label = new Label("Name List", Label.LEFT);
listPanel.add(label, BorderLayout.NORTH);
nameList = new List();
nameList.addItemListener(this);
numberList = new List();
listPanel.add(nameList, BorderLayout.CENTER);
Panel panel = new Panel(new BorderLayout());
add(panel, BorderLayout.WEST);
Panel editPanel = new Panel(new GridLayout(6, 1));
panel.add(editPanel, BorderLayout.NORTH);
label = new Label("Last Name", Label.LEFT);
editPanel.add(label);
lastName = new TextField();
editPanel.add(lastName);
label = new Label("First Name", Label.LEFT);
editPanel.add(label);
firstName = new TextField();
editPanel.add(firstName);
label = new Label("Phone Number", Label.LEFT);
editPanel.add(label);
phoneNumber = new TextField();
editPanel.add(phoneNumber);
}
// implementing ActionListener
public void actionPerformed(ActionEvent event) {
Object source = event.getSource();
if(source == newMI) {
nameList.removeAll();
numberList.removeAll();
fileName = null;
display(-1);
setTitle("White Pages"); // reset frame title
}
else if(source == openMI) {
doOpen();
}
else if(source == exitMI) {
System.exit(0);
}
else if(source == updateMI) {
int index = nameList.getSelectedIndex();
String name = lastName.getText().trim() + " " + firstName.getText().trim();
String number = phoneNumber.getText().trim();
if(index < 0) { // add a new entry
nameList.add(name);
numberList.add(number);
nameList.select(nameList.getItemCount()-1);
}
else { // update an existing entry
nameList.replaceItem(name, index);
numberList.replaceItem(number, index);
nameList.select(index);
}
}
else if(source == newEntryMI) {
nameList.select(-1);
display(-1);
}
// Can't get delete to work
else if(source == deleteMI) {
int name = nameList.getSelectedIndex();
int number = numberList.getSelectedIndex();
if(name >= 0){
nameList.remove(name);
numberList.remove(number);
}
}
// Can't get search to work
else if(source == searchMI) {
String searchName = JOptionPane.showInputDialog(this,
"Please enter a name (last first) to search:");
System.out.println("Name to search: " + searchName);
int index = nameList.getSelectedIndex();
String name = nameList.getItem(index);
for(int i=0; i < nameList.getItemCount(); i++){
if(name.equalsIgnoreCase(searchName)){
nameList.select(index);
System.out.println("We Found Him");
}
}
}
else if(source == sortMI) {
System.exit(0);
}
}
/**
* Implementing ItemListener to display the selected entry
*/
public void itemStateChanged(ItemEvent event) {
display(nameList.getSelectedIndex());
}
/**
* method to specify and open a file
*/
private void doOpen() {
// display file selection dialog
FileDialog fDialog = new FileDialog(this, "Open ...", FileDialog.LOAD);
fDialog.setVisible(true);
// Get the file name chosen by the user
String file = fDialog.getFile();
// If user canceled file selection, return without doing anything.
if(file == null)
return;
fileName = fDialog.getDirectory() + file;
// Try to create a file reader from the chosen file.
FileReader reader;
try {
reader = new FileReader(fileName);
} catch (FileNotFoundException ex) {
JOptionPane.showMessageDialog(this, "File Not Found: " + fileName,
"Error", JOptionPane.ERROR_MESSAGE);
doOpen();
return;
}
BufferedReader bReader = new BufferedReader(reader);
// remove items from before if any
nameList.removeAll();
numberList.removeAll();
// Try to read from the input file one line at a time.
try {
int index;
String name, number;
String textLine = bReader.readLine();
while (textLine != null) {
index = textLine.indexOf((int) ',');
if(index > 0) {
name = textLine.substring(0, index);
number = textLine.substring(index+1);
nameList.add(name.trim());
numberList.add(number.trim());
}
textLine = bReader.readLine();
}
bReader.close();
reader.close();
} catch (IOException ioe) {
JOptionPane.showMessageDialog(this, "Error reading file: " + ioe.toString(),
"Error", JOptionPane.ERROR_MESSAGE);
return;
}
setTitle("White Pages: " +file); // reset frame title
nameList.select(0);
display(0);
}
/**
* method to display the current entry
*/
private void display(int index) {
if(index < 0) {
lastName.setText("");
firstName.setText("");
phoneNumber.setText("");
}
else {
String name = nameList.getItem(index);
int space = name.indexOf((int) ' ');
lastName.setText(name.substring(0, space));
firstName.setText(name.substring(space+1));
phoneNumber.setText(numberList.getItem(index));
}
}
/**
* the main method
*/
public static void main(String[] argv) {
// create frame
System.out.println("Creating window ... ");
PhoneBook frame = new PhoneBook();
Dimension size = Toolkit.getDefaultToolkit().getScreenSize();
frame.setSize(size.width/2, size.height/2);
frame.setLocation(100, 100);
System.out.println("Your Screen Size: " + size.width + " (width) x "
+ size.height + " (height)");
//Working on search functions
String name1 = "John";
String name2 = "James";
if(name1.equalsIgnoreCase(name2)){
System.out.println("The two names are the same");
}
else
System.out.println("The two names are different");
//Working on Sort function
String nameA = "John";
String nameB = "James";
if(nameA.compareToIgnoreCase(nameB) == 0) {
System.out.println("The two names are the same");
}
else if (nameA.compareToIgnoreCase(nameB) < 0)
System.out.println("Name A comes before Name B");
else
System.out.println("Name A comes after Name B");
// add window closing listener
frame.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
// show the frame
frame.setVisible(true);
}
![enter image description here][1]}
答案 0 :(得分：0)
两件事：
搜索循环不正确，应为：
else if(source == searchMI) {
String searchName = JOptionPane.showInputDialog(this,
"Please enter a name (last first) to search:");
System.out.println("Name to search: " + searchName);
String name;
for(int i=0; i < nameList.getItemCount(); i++){
name = nameList.getItem(i);
if(name.equalsIgnoreCase(searchName)){
nameList.select(i);
//add this code for display data:
String[] n = name.split(" ");
firstName.setText(n[0]);
lastName.setText(n[1]);
phoneNumber.setText(numberList.getItem(i));
//end
System.out.println("We Found Him");
}
}
}
但搜索仅适用于“姓氏+名字”字符串。
您使用索引变量的方式不正确。它没有随着循环而改变。
删除的问题由int number = numberList.getSelectedIndex();决定 - 你没有选择的项目（至少在上面的代码中，根本没有可见的numberList），所以它返回-1。它存在ArrayOutOfBoundsException。因此，实施此解决方案：
else if(source == deleteMI) {
int index = nameList.getSelectedIndex();
if(index >= 0){
nameList.remove(index);
numberList.remove(index);
}
}
至于排序方法，我现在可以做的就是：
else if(source == sortMI){
String[] list = nameList.getItems();
String[] nums = numberList.getItems();
Arrays.sort(list);
Arrays.sort(nums);
for(int i = 0; i<list.length;i++){
nameList.replaceItem(list[i],i);
numberList.replaceItem(nums[i],i);
}
nameList.revalidate();
numberList.revalidate();
}
它不是优雅的代码，但据我所知，它的工作原理。我希望它能满足你的需求。