扩展AbstractTableModel中的自定义setValueAt方法 [英] custom setValueAt method in extended AbstractTableModel
本文介绍了扩展AbstractTableModel中的自定义setValueAt方法的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
因此，我正在用Java开发DVD租赁系统，并且遇到了视图问题. 这是我的代码:
So I am working on a DVD Rental System in Java and have run into a view problems. Here is my code:
import javax.swing.*;
import javax.swing.table.AbstractTableModel;
import javax.swing.table.TableModel;
import java.awt.*;
import java.awt.event.*;
public class RentalSystem extends JFrame {
JMenuBar menuBar;
JMenuItem insertMember;
JMenuItem deleteMember;
JMenuItem editMember;
JMenuItem retrieveMember;
JMenuItem insertRelease;
JMenuItem deleteRelease;
JMenuItem editRelease;
JMenuItem retrieveRelease;
JMenu menu;
JMenu menu2;
JComboBox searchMember;
JComboBox searchRelease;
JButton adminButton;
JButton userButton;
JButton existingUser;
JButton newUser;
JTable memberTable;
JTable releaseTable;
int existingUserCheck = 1; //0 = existing user, 1 = new user
int adminCheck = 1; //0 = admin, 1 = customer
public RentalSystem()
{
super("Tape/DVD/Game Rental System");
setBounds(0,0,1000,500);
//while(adminCheck == 0)
{
display2();
while(existingUserCheck == 0) {
}
}
}
private class MenuActionListener implements ActionListener {
public void actionPerformed(ActionEvent e) {
if(e.getSource() == "insertMember");
{
String name = JOptionPane.showInputDialog("Enter Last Name:");
String name2 = JOptionPane.showInputDialog("Enter First Name:");
String ss = JOptionPane.showInputDialog("Enter Social Security Number:");
int a = Integer.parseInt(ss);
String email = JOptionPane.showInputDialog("Enter Email Address:");
String phoneNumber = JOptionPane.showInputDialog("Enter Phone Number:");
int b = Integer.parseInt(phoneNumber);
String address = JOptionPane.showInputDialog("Enter Address:");
Member member = new Member(name, name2, a, email, b, address);
//add member to table
}
if(e.getSource() == "deleteMember");
{
}
if(e.getSource() == "editMember");
{
}
if(e.getSource() == "retrieveMember");
{
}
if(e.getSource() == "insertRelease");
{
String title = JOptionPane.showInputDialog(this ,"Enter Title:");
String type = JOptionPane.showInputDialog(this ,"Enter Type(Tape/DVD/Game):");
String releaseYear = JOptionPane.showInputDialog(this ,"Enter Year of Release:");
int a = Integer.parseInt(releaseYear);
String price = JOptionPane.showInputDialog(this ,"Enter Price:");
int b = Integer.parseInt(price);
Item item = new Item(title, type, a, b);
//add item to table
}
if(e.getSource() == "deleteRelease");
{
}
if(e.getSource() == "editRelease");
{
}
if(e.getSource() == "retrieveRelease");
{
}
}
}
private class ComboBoxActionListener implements ActionListener {
public void actionPerformed(ActionEvent e) {
String s = (String) searchMember.getSelectedItem();
String f = (String) searchRelease.getSelectedItem();
if(s.equals("Last Name")){
}
else if(s.equals("First Name")){
}
else if(s.equals("Phone Number")){
}
else if(s.equals("Member ID")){
}
if(f.equals("Title")){
}
else if(f.equals("Category")){
}
else if(f.equals("Type")){
}
else if(f.equals("Rental ID")){
}
if(e.getSource() == "Existing User")
{
}
}
}
private class ButtonListener implements ActionListener {
@Override
public void actionPerformed(ActionEvent e) {
if(e.getSource() == adminButton)
{
menuBar = new JMenuBar();
menu = new JMenu("Members");
menuBar.add(menu);
menu2 = new JMenu("Releases");
menuBar.add(menu2);
insertMember = new JMenuItem("Insert New Member");
deleteMember = new JMenuItem("Delete Member");
editMember = new JMenuItem("Edit Member");
retrieveMember = new JMenuItem("Retrieve Member");
menu.add(insertMember);
menu.add(deleteMember);
menu.add(editMember);
menu.add(retrieveMember);
insertRelease = new JMenuItem("Insert New Release");
deleteRelease = new JMenuItem("Delete Release");
editRelease = new JMenuItem("Edit Release");
retrieveRelease = new JMenuItem("Retrieve Release");
menu2.add(insertRelease);
menu2.add(deleteRelease);
menu2.add(editRelease);
menu2.add(retrieveRelease);
JScrollPane c = new JScrollPane();
JScrollPane b = new JScrollPane();
TableModel memberModel = new MemberTableModel();
TableModel itemModel = new ItemTableModel();
memberTable = new JTable(memberModel);
releaseTable = new JTable(itemModel);
c.add(memberTable);
c.add(releaseTable);
String[] searchMemberChoices = {"Search Members By:", "Last Name", "First Name","Phone Number", "Member ID"};
String[] searchReleaseChoices = {"Search Releases By:", "Title" , "Category", "Type", "Release ID" };
searchMember = new JComboBox(searchMemberChoices);
searchRelease = new JComboBox(searchReleaseChoices);
//add(c, BorderLayout.CENTER);
//add(b, BorderLayout.SOUTH);
add(searchMember, BorderLayout.WEST);
add(searchRelease, BorderLayout.EAST);
add(menuBar, BorderLayout.NORTH);
setVisible(true);
setResizable(true);
setDefaultCloseOperation(EXIT_ON_CLOSE);
insertMember.addActionListener(new MenuActionListener());
deleteMember.addActionListener(new MenuActionListener());
editMember.addActionListener(new MenuActionListener());
retrieveMember.addActionListener(new MenuActionListener());
insertRelease.addActionListener(new MenuActionListener());
deleteRelease.addActionListener(new MenuActionListener());
editRelease.addActionListener(new MenuActionListener());
retrieveRelease.addActionListener(new MenuActionListener());
searchMember.addActionListener(new ComboBoxActionListener());
searchRelease.addActionListener(new ComboBoxActionListener());
}
if(e.getSource() == userButton)
{
adminCheck = 1;
menuBar = new JMenuBar();
menu = new JMenu("Members");
menuBar.add(menu);
menu2 = new JMenu("Releases");
menuBar.add(menu2);
retrieveMember = new JMenuItem("Retrieve Member");
menu.add(retrieveMember);
retrieveRelease = new JMenuItem("Retrieve Release");
menu2.add(retrieveRelease);
JScrollPane c = new JScrollPane();
JScrollPane b = new JScrollPane();
TableModel memberModel = new MemberTableModel();
TableModel itemModel = new ItemTableModel();
memberTable = new JTable(memberModel);
releaseTable = new JTable(itemModel);
c.add(memberTable);
c.add(releaseTable);
String[] searchMemberChoices = {"Search Members By:", "Last Name", "First Name","Phone Number", "Member ID"};
String[] searchReleaseChoices = {"Search Releases By:", "Title" , "Category", "Type", "Release ID" };
searchMember = new JComboBox(searchMemberChoices);
searchRelease = new JComboBox(searchReleaseChoices);
//add(c, BorderLayout.CENTER);
//add(b, BorderLayout.SOUTH);
add(searchMember, BorderLayout.WEST);
add(searchRelease, BorderLayout.EAST);
add(menuBar, BorderLayout.NORTH);
setVisible(true);
setResizable(true);
setDefaultCloseOperation(EXIT_ON_CLOSE);
insertMember.addActionListener(new MenuActionListener());
deleteMember.addActionListener(new MenuActionListener());
editMember.addActionListener(new MenuActionListener());
retrieveMember.addActionListener(new MenuActionListener());
insertRelease.addActionListener(new MenuActionListener());
deleteRelease.addActionListener(new MenuActionListener());
editRelease.addActionListener(new MenuActionListener());
retrieveRelease.addActionListener(new MenuActionListener());
searchMember.addActionListener(new ComboBoxActionListener());
searchRelease.addActionListener(new ComboBoxActionListener());
}
if(e.getSource() == existingUser);
{
}
if(e.getSource() == newUser)
{
existingUserCheck = 1;
JTextField field1 = new JTextField("");
JTextField field2 = new JTextField("");
JTextField field3 = new JTextField("");
JTextField field4 = new JTextField("");
JTextField field5 = new JTextField("");
JTextField field6 = new JTextField("");
JPanel panel = new JPanel(new GridLayout(0, 1));
panel.add(new JLabel("Last Name:"));
panel.add(field1);
panel.add(new JLabel("First Name:"));
panel.add(field2);
panel.add(new JLabel("Social Security #:"));
panel.add(field3);
panel.add(new JLabel("Email:"));
panel.add(field4);
panel.add(new JLabel("Phone Number:"));
panel.add(field5);
panel.add(new JLabel("Address"));
panel.add(field6);
add(panel);
int result = JOptionPane.showConfirmDialog(null, panel, "Registration",
JOptionPane.OK_CANCEL_OPTION, JOptionPane.PLAIN_MESSAGE);
if (result == JOptionPane.OK_OPTION) {
int ss = Integer.parseInt(field3.getText());
int phoneNumber = Integer.parseInt(field5.getText());
//memberTable.addMember(field1.getText(),field2.getText(), ss, field4.getText(), phoneNumber, field6.getText());
}
}
}
}
class MemberTableModel extends AbstractTableModel {
private String[] headers = {"Last Name", "First Name", "SS#", "Email", "Phone Number", "Address"};
@Override
public int getColumnCount() {
return headers.length;
}
@Override
public int getRowCount() {
// TODO Auto-generated method stub
return 0;
}
@Override
public Object getValueAt(int arg0, int arg1) {
// TODO Auto-generated method stub
return null;
}
public void setValueAt(Member a, int rowIndex, int colIndex)
{
}
}
class ItemTableModel extends AbstractTableModel {
@Override
public int getColumnCount() {
// TODO Auto-generated method stub
return 0;
}
@Override
public int getRowCount() {
// TODO Auto-generated method stub
return 0;
}
@Override
public Object getValueAt(int arg0, int arg1) {
// TODO Auto-generated method stub
return null;
}
public void setValueAt()
{
}
}
public void display()//displays first screen:admin/user log-in
{
userButton = new JButton("User");
adminButton = new JButton("Admin");
JPanel panel = new JPanel(new GridLayout(0, 1));
panel.add(userButton);
panel.add(adminButton);
add(panel);
userButton.addActionListener(new ButtonListener());
adminButton.addActionListener(new ButtonListener());
setVisible(true);
setResizable(true);
setDefaultCloseOperation(EXIT_ON_CLOSE);
}
public void display2()//displays second screen:user log-in / register
{
existingUser = new JButton("Existing User");
newUser = new JButton("New User");
JPanel panel = new JPanel(new GridLayout(0, 1));
panel.add(newUser);
panel.add(existingUser);
add(panel);
existingUser.addActionListener(new ButtonListener());
newUser.addActionListener(new ButtonListener());
setVisible(true);
setResizable(true);
setDefaultCloseOperation(EXIT_ON_CLOSE);
}
public void display3() //displays user screen/functionality
{
}
public static void main(String[] args) {
JFrame frame = new RentalSystem();
}
}
现在，Member和Item只是我制作的代表用户(成员)和电影/游戏(Item)的对象类.
Now, Member and Item are just Object classes I made to represent users(Members) and the movies/games(Items).
public class Member {
int status;
String firstName;
String lastName;
int ss;
String email;
int phoneNumber;
String address;
int memberID;
public Member()
{
}
public Member(String firstName, String lastName, int ss, String email, int phoneNumber, String address)
{
this.firstName = firstName;
this.lastName = lastName;
this.ss = ss;
this.email = email;
this.phoneNumber = phoneNumber;
this.address = address;
}
public void setName(String firstName, String lastName)
{
this.firstName = firstName;
this.lastName = lastName;
}
public String getName()
{
return firstName + " " + lastName;
}
public void setSS(int ss)
{
this.ss = ss;
}
public int getSS()
{
return ss;
}
public void setEmail(String email)
{
this.email = email;
}
public String getEmail()
{
return email;
}
public void setPhoneNumber(int phoneNumber)
{
this.phoneNumber = phoneNumber;
}
public int getPhoneNumber()
{
return phoneNumber;
}
public void setAddress(String address)
{
this.address = address;
}
public String getAddress()
{
return address;
}
public void setMemberID(int memberID)
{
this.memberID = memberID;
}
public int getMemberID()
{
return memberID;
}
public void setStatus(int status)
{
this.status = status;
}
public int getStatus()
{
return status;
}
}
和
public class Item {
String title;
String type;
int releaseYear;
int rentalID;
int price;
boolean inStock;
public Item()
{
}
public Item(String title, String type, int releaseYear, int price)
{
this.title = title;
this.type = type;
this.releaseYear = releaseYear;
this.price = price;
}
public void setTitle(String title)
{
this.title = title;
}
public String getTitle()
{
return title;
}
public void setReleaseYear(int releaseYear)
{
this.releaseYear = releaseYear;
}
public int getReleaseYear()
{
return releaseYear;
}
public void setRentalID(int rentalID)
{
this.rentalID = rentalID;
}
public int getRentalID()
{
return rentalID;
}
public void setPrice(int price)
{
this.price = price;
}
public int getPrice()
{
return price;
}
}
我的问题是，我对如何创建一个自定义的，重写的'SetValueAt()'方法感到困惑，该方法用来自Member/Items的信息填充JTables. 另一个问题是侦听器类中的所有空if语句.我不确定如何执行它们.如果有人可以提供有关这些问题或我可能错过的任何其他方面的指导，我将不胜感激.
My problem is that I am confused on how to create a custom, overridden 'SetValueAt()' method to populate the JTables with the information from the Members/Items. Another problem is all the empty if statements in the Listener classes. I'm not sure how to go about their implementation. If anyone could provide some guidance on any of these issues, or anything else I might have missed, I would greatly appreciate any feedback.
推荐答案
让我们忽略代码中所有有趣的"问题，并着重于TableModel
Let's ignore all the "interesting" issues with the code and focus on the TableModel
表是二维数据矩阵，分布在一系列行和列中
A table is a two dimensional matrix of data, spread over a series of rows and column
TableModel提供了契约，JTable(视图)可以通过该契约与TableModel ...
The TableModel provides the contract by which the JTable (the view) can interact with the data represented by the TableModel...
public interface TableModel
{
public int getRowCount();
public int getColumnCount();
public String getColumnName(int columnIndex);
public Class<?> getColumnClass(int columnIndex);
public boolean isCellEditable(int rowIndex, int columnIndex);
public Object getValueAt(int rowIndex, int columnIndex);
public void setValueAt(Object aValue, int rowIndex, int columnIndex);
public void addTableModelListener(TableModelListener l);
public void removeTableModelListener(TableModelListener l);
}
这很重要，因为您的数据需要符合此合同.
This is important, as you data needs to conform to this contract.
您有一个Member类，该类具有一系列已定义的属性，每个属性表示一个可能的列值，这使Member的每个实例成为数据的行".
You have a Member class which has a series of defined properties, each property represents a possible column value, this makes each instance of Member a "row" of data.
您需要决定的第一件事是如何管理所有Member.既然您已经声明需要动态"(或可变)模型，那么使用更好的数据结构之一可能是ArrayList，因为它可以满足您的需求并具有快速的非顺序访问(您可以抓住快速从随机值中提取值.
The first thing you need to decide is how you are going to manage all the Members. Since you've stated you need a "dynamic" (or mutable) model, one of the better data structures to use might be ArrayList, as it can grow to meet your needs and has fast non-sequential access (you can grab values from it at random points quickly).
public class MemberTableModel extends AbstractTableModel {
private String[] headers = {"Last Name", "First Name", "SS#", "Email", "Phone Number", "Address"};
private List<Member> members;
public MemberTableModel() {
members = new ArrayList<>(25);
}
public MemberTableModel(List<Member> members) {
this();
this.members.addAll(members);
}
public MemberTableModel(Member... members) {
this(Arrays.asList(members));
}
@Override
public int getRowCount() {
return members.size();
}
@Override
public int getColumnCount() {
return headers.length;
}
@Override
public String getColumnName(int column) {
return headers[column];
}
好的，现在我们需要一些获取特定行的列...
Okay, now we need some we to get the column for a particular row...
protected Member getMemberAt(int row) {
return members.get(row);
}
@Override
public Object getValueAt(int row, int col) {
Object value = null;
Member member = getMemberAt(row);
switch (col) {
case 0:
// Need getter for last name
break;
case 1:
// Need getter for first name
break;
case 2:
value = member.getSS();
break;
case 3:
value = member.getEmail();
case 4:
value = member.getPhoneNumber();
case 5:
value = member.getAddress();
}
return value;
}
设置值几乎是相同的过程...
Setting the value is pretty much the same process...
@Override
public void setValueAt(Object value, int rowIndex, int colIndex) {
Member member = getMemberAt(rowIndex);
switch (colIndex) {
case 0:
member.setName(value.toString(), member.getLastName());
break;
case 1:
member.setName(member.getFirstName(), value.toString());
break;
case 2:
if (value instanceof Integer) {
member.setSS((Integer) value);
}
break;
case 3:
member.setEmail(value.toString());
break;
case 4:
if (value instanceof Integer) {
member.setPhoneNumber((Integer)value);
}
break;
case 5:
member.setAddress(value.toString());
break;
}
fireTableRowsUpdated(rowIndex, colIndex);
}
}
请注意，此方法没有验证，您应该检查值是否符合数据的基本要求...
Note, there is no validation in this method, you should be checking to see if the values meet your basic requirements for the data...
但是，要使表可编辑，您需要覆盖模型的isCellEdtiable方法...
But, to make a table editable, you need to override the isCellEdtiable method of the model...
@Override
public boolean isCellEditable(int rowIndex, int columnIndex) {
return true;
}
在模型中添加或删除成员，您需要在模型中提供功能，例如...
Take add or remove members from the model, you need to supply the functionality in your model, for example...
public void add(Member member) {
int size = members.size();
members.add(member);
fireTableRowsInserted(size, size);
}
public void remove(Member member) {
int index = members.indexOf(member);
if (index > -1) {
members.remove(member);
fireTableRowsDeleted(index, index);
}
}
仔细研究如何使用表， Collections Trail 了解更多详细信息
Take a closer look at How to Use Tables and Collections Trail for more details
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