我有一个 JTable，它显示保存在 ArrayList 集合中的客户对象列表。从这个 JTable 中，我希望能够突出显示特定客户，然后单击“删除客户”按钮，该按钮从选定的表行中提取 ID 列值并使用它通过迭代器搜索 ArrayList，找到匹配客户，并将其从集合中删除。我在挥杆组件和事件监听器方面的专业知识还有很多不足之处，到目前为止，我尝试了大约 5 种不同的组合，但我一无所获。我该怎么做？到目前为止，我的代码的相关部分是：
class CustomerFrame extends JFrame{
public CustomerFrame(travelagent agent){
CustomerPanel cp = new CustomerPanel(agent, this);
setSize(800,500);
setLocationRelativeTo(null);
setTitle("Actions for customer");
add(cp);
}
}
class CustomerPanel extends JPanel implements ActionListener, ListSelectionListener{
private travelagent agent;
private JButton addCust;
private JButton deleteCust;
private JButton editCust;
private JButton bookFlight;
private JButton exit;
private CustomerFrame frame;
private Object selectedID;
private JTable ref;
public CustomerPanel(travelagent agent, CustomerFrame frame){
ListCustPanel lp = new ListCustPanel(agent);
setLayout(new GridLayout(2,1,5,5));
ref = lp.getTable();
ListSelectionModel sel = ref.getSelectionModel();
sel.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
sel.addListSelectionListener(this);
this.agent = agent;
this.frame = frame;
JLabel options = new JLabel("Options:");
addCust = new JButton("Add customer");
deleteCust = new JButton("Delete customer");
editCust = new JButton("Edit Customer");
bookFlight = new JButton("Book a flight");
exit = new JButton("Back to main menu");
options.setHorizontalAlignment(SwingConstants.CENTER);
JPanel b = new JPanel(new GridLayout(3,2,5,5));
b.add(options);
b.add(addCust);
b.add(deleteCust);
b.add(editCust);
b.add(bookFlight);
b.add(exit);
add(lp);
add(b);
addCust.addActionListener(this);
deleteCust.addActionListener(this);
editCust.addActionListener(this);
bookFlight.addActionListener(this);
exit.addActionListener(this);
}
public void valueChanged(ListSelectionEvent l){
if(!l.getValueIsAdjusting()){
int index = ref.getSelectedRow();
selectedID = ref.getValueAt(index, 0);
}
}
public void actionPerformed(ActionEvent e){
if(e.getSource() == addCust){
NewCustFrame cf = new NewCustFrame(agent, frame);
cf.setVisible(true);
cf.setDefaultCloseOperation(NewCustFrame.DISPOSE_ON_CLOSE);
if(e.getSource() == deleteCust){
DeleteCustFrame df = new DeleteCustFrame(agent, selectedID);
df.setVisible(true);
df.setDefaultCloseOperation(DeleteCustFrame.DISPOSE_ON_CLOSE);
}
if(e.getSource() == editCust){
}
if(e.getSource() == bookFlight){
}
if(e.getSource() == exit){
frame.dispose();
}
}
}
}
/*
* this displays the list of customers:
*/
class ListCustPanel extends JPanel{
private static final long serialVersionUID = 1L;
private JTable table;
public ListCustPanel(travelagent agent){
String[] colNames = {"ID", "First Name", "Last Name"};
int size = agent.getCust().size(); //get the size of the arraylist in order to define an object array to contain information in
Object[][] data = new Object[size][3]; // create the array
int i = 0;
Iterator<customer> iter = agent.getCust().iterator(); //create an iterator to progress thought the arraylist
while(iter.hasNext()){
customer temp = iter.next(); //assign the current customer to a variable
//extract its attributes and feed into object array
data[i][0] = temp.getID();
data[i][1] = temp.getFname();
data[i++][2] = temp.getLname();
}
setLayout(new GridLayout(1,1,5,5));
// convert the object array into a JTable
table = new JTable(data, colNames);
table.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
// create a sorter to sort table rows
TableRowSorter<TableModel> sorter = new TableRowSorter<TableModel>(table.getModel());
table.setRowSorter(sorter);
ArrayList<SortKey> sortKeys = new ArrayList<RowSorter.SortKey>();
sortKeys.add(new RowSorter.SortKey(2, SortOrder.ASCENDING));
sorter.setSortKeys(sortKeys);
JScrollPane scrollPane = new JScrollPane(table);
table.setFillsViewportHeight(true);
add(scrollPane);
}
public JTable getTable(){
return table;
}
}
/*
* delete the customer using this
*/
class DeleteCustFrame extends JFrame{
public DeleteCustFrame(travelagent agent, Object ID){
DeleteCustPanel dcp = new DeleteCustPanel(agent, this, ID);
add(dcp);
setSize(300,200);
setTitle("Delete Customer");
setLocationRelativeTo(null);
}
}
class DeleteCustPanel extends JPanel implements ActionListener{
private travelagent agent;
private JButton delete;
private JButton cancel;
private JTextField id;
private DeleteCustFrame frame;
public int ID;
public DeleteCustPanel(travelagent agent, DeleteCustFrame frame, Object ID){
this.ID = (int)ID;
this.agent = agent;
setLayout(new GridLayout(3,1,5,5));
String fname = null;
String lname = null;
boolean hasFlight = false;
Iterator<customer> iter = agent.getCust().iterator();
while(iter.hasNext()){
customer temp = iter.next();
if(temp.getID() == this.ID){
fname = temp.getFname();
lname = temp.getLname();
}
if(temp.getNumFlight() > 0){
hasFlight = true;
}
}
JLabel desc = new JLabel("Customer: " + ID + " " + fname + " " + lname);;
desc.setHorizontalAlignment(SwingConstants.CENTER);
JLabel yesFlight;
if(hasFlight){
yesFlight = new JLabel("This customer has flights booked!");
}else{
yesFlight = new JLabel("No flights are booked for this customer");
}
yesFlight.setHorizontalAlignment(SwingConstants.CENTER);
JPanel buttonPanel = new JPanel();
buttonPanel.setLayout(new GridLayout(1,2,5,5));
buttonPanel.add(delete);
buttonPanel.add(cancel);
add(desc);
add(yesFlight);
add(buttonPanel);
delete.addActionListener(this);
cancel.addActionListener(this);
}
public void actionPerformed(ActionEvent e) {
if(e.getSource() == delete){
Iterator<customer> iter = agent.getCust().iterator();
while(iter.hasNext()){
customer temp = iter.next();
if(temp.getID() == ID){
agent.deleteCust(temp);
}
}
JOptionPane.showMessageDialog(null, "Customer deleted!", null, JOptionPane.PLAIN_MESSAGE);
frame.dispose();
}
if(e.getSource() == cancel){
frame.dispose();
}
}
}
到目前为止，当我单击删除客户并突出显示客户时，没有采取任何行动。我知道很长的问题，但如果有帮助，我怀疑我的问题发生在我试图使用 ListSelectionListener 的地方。