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我在使用自定義表格模型和自定義鏈接列表創建JTable時遇到問題。我希望有一些簡單的變化，我錯過了。自定義鏈接列表存在問題並應用於JTable
我的主類：
import java.util.ArrayList;
import java.util.*;
import java.io.*;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.table.*;
public class StudentInterface {
public static void main(String[] args){
new StudentInterface();
}
//create a linked list
MyLinkedList studentPack = new MyLinkedList();
public StudentInterface(){
//create jFrame
JFrame jFrame = new JFrame("Student Information Interface");
jFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
jFrame.setSize(400,300);
jFrame.setVisible(true);
jFrame.setDefaultLookAndFeelDecorated(true);
jFrame.setPreferredSize(new Dimension(600, 400));
//create content panes
JPanel headerPanel = new JPanel();
JPanel tablePanel = new JPanel();
JPanel buttonPanel = new JPanel();
JPanel combinedPanel = new JPanel();
headerPanel.setLayout(new BorderLayout());
tablePanel.setLayout(new FlowLayout());
buttonPanel.setLayout(new FlowLayout());
combinedPanel.setLayout(new BorderLayout());
//add label to header content panel
JLabel headerLabel1 = new JLabel("Welcome to the Student Information Interface");
JLabel headerLabel2 = new JLabel("***Click a cell to edit data***");
JLabel headerLabel3 = new JLabel("***Click a column header to sort***");
headerLabel1.setHorizontalAlignment(JLabel.CENTER);
headerLabel2.setHorizontalAlignment(JLabel.CENTER);
headerLabel3.setHorizontalAlignment(JLabel.CENTER);
headerPanel.add(headerLabel1, BorderLayout.NORTH);
headerPanel.add(headerLabel2, BorderLayout.CENTER);
headerPanel.add(headerLabel3, BorderLayout.SOUTH);
//Where the GUI is created:
JMenuBar menuBar;
JMenu menu, submenu;
JMenuItem exitMenuItem;
JMenuItem saveMenuItem;
JMenuItem loadMenuItem;
//Create the menu bar.
menuBar = new JMenuBar();
//Build the main menu.
menu = new JMenu("File");
menu.setMnemonic(KeyEvent.VK_A);
menu.getAccessibleContext().setAccessibleDescription("The only menu in this program that has menu items");
menuBar.add(menu);
//create menu items
exitMenuItem = new JMenuItem("Exit",KeyEvent.VK_T);
menu.add(exitMenuItem);
jFrame.setJMenuBar(menuBar);
//create table
tableModel model;
model = new tableModel(new MyLinkedList());
JTable table = new JTable(model);
//add list to list content panel
JScrollPane scrollPane = new JScrollPane(table);
scrollPane.setPreferredSize(new Dimension(580, 400));
tablePanel.add(scrollPane);
//add buttons to button content panel
JButton addButton = new JButton("Add");
JButton removeButton = new JButton("Remove");
buttonPanel.add(addButton);
buttonPanel.add(removeButton);
addButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
//verify pack is not full
int packSize = studentPack.size();
if (packSize >= 10)
{
JOptionPane.showMessageDialog(null,
"The interface is full. Please remove a student first.",
"Interface Full",
JOptionPane.WARNING_MESSAGE);
return;
}
JPanel p1 = new JPanel(new GridLayout(2,1));
JTextField t1 = new JTextField();
JLabel labell = new JLabel("Please enter the first name of the student you would like to add:");
p1.add(labell);
p1.add(t1);
JOptionPane.showMessageDialog(null,p1,"First Name",JOptionPane.PLAIN_MESSAGE);
String userFirstName = t1.getText();
JPanel p2 = new JPanel(new GridLayout(2,1));
JTextField t2 = new JTextField();
JLabel label2 = new JLabel("Please enter the last name of the student you would like to add:");
p2.add(label2);
p2.add(t2);
JOptionPane.showMessageDialog(null,p2,"Last Name",JOptionPane.PLAIN_MESSAGE);
String userLastName = t2.getText();
JPanel p3 = new JPanel(new GridLayout(2,1));
JTextField t3 = new JTextField();
JLabel label3 = new JLabel("Please enter the major of the student you would like to add:");
p3.add(label3);
p3.add(t3);
JOptionPane.showMessageDialog(null,p3,"Major",JOptionPane.PLAIN_MESSAGE);
String userMajor = t3.getText();
JPanel p4 = new JPanel(new GridLayout(2,1));
JTextField t4 = new JTextField();
JLabel label4 = new JLabel("Please enter the NetID of the student you would like to add:");
p4.add(label4);
p4.add(t4);
JOptionPane.showMessageDialog(null,p4,"NetID",JOptionPane.PLAIN_MESSAGE);
String userNetID = t4.getText();
JPanel p5 = new JPanel(new GridLayout(2,1));
JTextField t5 = new JTextField();
JLabel label5 = new JLabel("Please enter the gender of the student you would like to add:");
p5.add(label5);
p5.add(t5);
JOptionPane.showMessageDialog(null,p5,"Gender",JOptionPane.PLAIN_MESSAGE);
String userGender = t5.getText();
JPanel p6 = new JPanel(new GridLayout(2,1));
JTextField t6 = new JTextField();
JLabel label6 = new JLabel("Please enter the UIN of the student you would like to add:");
p6.add(label6);
p6.add(t6);
JOptionPane.showMessageDialog(null,p6,"UIN",JOptionPane.PLAIN_MESSAGE);
String userUIN = t6.getText();
JPanel p7 = new JPanel(new GridLayout(2,1));
JTextField t7 = new JTextField();
JLabel label7 = new JLabel("Please enter the age of the student you would like to add:");
p7.add(label7);
p7.add(t7);
JOptionPane.showMessageDialog(null,p7,"Age",JOptionPane.PLAIN_MESSAGE);
String userAgeInput = t7.getText();
int userAge = Integer.parseInt(userAgeInput);
JPanel p8 = new JPanel(new GridLayout(2,1));
JTextField t8 = new JTextField();
JLabel label8 = new JLabel("Please enter the GPA of the student you would like to add:");
p8.add(label8);
p8.add(t8);
JOptionPane.showMessageDialog(null,p8,"GPA",JOptionPane.PLAIN_MESSAGE);
String userGPAInput = t8.getText();
double userGPA = Double.parseDouble(userGPAInput);
//create student Student
Student studentStudent = new Student(userFirstName, userLastName, userMajor, userGPA, userUIN, userNetID, userAge, userGender);
//store Student in linked list
model.addStudent(studentStudent);
}
});
removeButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
//verify pack is not full
if (studentPack.size() == 0)
{
JOptionPane.showMessageDialog(null,
"The interface is empty. Please add a student first.",
"Interface Empty",
JOptionPane.WARNING_MESSAGE);
return;
}
JPanel p9 = new JPanel(new GridLayout(2,1));
JTextField t9 = new JTextField();
JLabel label9 = new JLabel("Please enter the first name of the student you would like to remove: **Case Sensitive**");
p9.add(label9);
p9.add(t9);
JOptionPane.showMessageDialog(null,p9,"First Name",JOptionPane.PLAIN_MESSAGE);
String userFirstName = t9.getText();
JPanel p10 = new JPanel(new GridLayout(2,1));
JTextField t10 = new JTextField();
JLabel label10 = new JLabel("Please enter the last name of the student you would like to remove: **Case Sensitive**");
p10.add(label10);
p10.add(t10);
JOptionPane.showMessageDialog(null,p10,"First Name",JOptionPane.PLAIN_MESSAGE);
String userLastName = t10.getText();
//remove student Student in linked list
}
});
exitMenuItem.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
System.exit(0);
}
});
//nest button and list panels in combined content panel
combinedPanel.add(headerPanel, BorderLayout.NORTH);
combinedPanel.add(tablePanel, BorderLayout.CENTER);
combinedPanel.add(buttonPanel, BorderLayout.SOUTH);
//add combined content panel to frame
jFrame.add(combinedPanel);
jFrame.pack();
jFrame.setLocationRelativeTo(null);
JOptionPane.showMessageDialog(null,
"***Click a cell to edit data*** \n ***Click a column header to sort***", "How to edit/sort data", JOptionPane.INFORMATION_MESSAGE);
}
public class tableModel extends AbstractTableModel {
public final String[] columnNames = { "First Name", "Last Name", "Major:", "GPA", "UIN", "NetID", "Age", "Gender" };
private MyLinkedList data;
public tableModel(MyLinkedList data) {
this.data = data;
}
@Override
public int getColumnCount() {
return columnNames.length;
}
@Override
public String getColumnName(int column) {
return columnNames[column];
}
@Override
public int getRowCount() {
return data.size();
}
public void addStudent(Student student) {
int row = data.size();
data.add(student);
fireTableRowsInserted(row, row);
}
public void removeStudent(int i) {
int row = data.size();
data.remove(i);
fireTableRowsDeleted(row, row);
}
@Override
public Student getValueAt(int rowIndex, int columnIndex) {
Object student = data.getNode(rowIndex);
if (student == null) {
return null;
}
switch (columnIndex) {
case 0:
return student.getFirstName();
case 1:
return student.getLastName();
case 2:
return student.getMajor();
case 3:
return student.getGPA();
case 4:
return student.getUIN();
case 5:
return student.getNetID();
case 6:
return student.getAge();
case 7:
return student.getGender();
default:
return null;
}
}
}
}
這裏是我的學生對象類：
public class Student {
// Declare attributes here
String firstName;
String lastName;
String major;
double gpa;
String uin;
String netid;
int age;
String gender;
public Student(String newFirstName, String newLastName, String newMajor, double newGPA, String newUIN, String newNetID, int newAge, String newGender){
setFirstName(newFirstName);
setLastName(newLastName);
setMajor(newMajor);
setGPA(newGPA);
setUIN(newUIN);
setNetID(newNetID);
setAge(newAge);
setGender(newGender);
}
//Mutators
public void setFirstName(String newFirstName) {
firstName = newFirstName;
}
public void setLastName(String newLastName) {
lastName = newLastName;
}
public void setMajor(String newMajor) {
major = newMajor;
}
public void setGPA(double newGPA) {
gpa = newGPA;
}
public void setUIN(String newUIN) {
uin = newUIN;
}
public void setNetID(String newNetID) {
netid = newNetID;
}
public void setAge(int newAge) {
age = newAge;
}
public void setGender(String newGender) {
gender = newGender;
}
//Accessors
public String getFirstName() {
return firstName;
}
public String getLastName() {
return lastName;
}
public String getMajor() {
return major;
}
public double getGPA() {
return gpa;
}
public String getUIN() {
return uin;
}
public String getNetID() {
return netid;
}
public int getAge() {
return age;
}
public String getGender() {
return gender;
}
}
這裏是我的返工鏈表類：
public class MyLinkedList<Student>{
private Node<Student> lastNode;
private int nodeCount;
public MyLinkedList(){
this.lastNode = null;
this.nodeCount = 0;
}
public int size() {
return nodeCount;
}
public boolean isEmpty() {
return this.nodeCount == 0;
}
public void add(Student student) {
Node<Student> currentNode = new Node<Student>(student);
if (this.lastNode != null) {
currentNode.index = lastNode.index + 1;
currentNode.previousNode = lastNode;
lastNode.nextNode = currentNode;
}else {
currentNode.previousNode = null;
currentNode.index = 0;
}
this.lastNode = currentNode;
this.nodeCount++;
}
public Student get(int index){
//error handling
if(this.isEmpty() || index < 0 || index > this.nodeCount){
return null;
}
//
Node<Student> currentNode;
int count = lastNode.index - index;
currentNode = lastNode;
while (count > 0) {
currentNode = currentNode.previousNode;
count--;
}
return currentNode.student;
}
public Node<Student> getNode(int index){
//error handling
if(this.isEmpty() || index < 0 || index > this.nodeCount){
return null;
}
//
int count = lastNode.index - index;
Node<Student> currentNode = lastNode;
while (count > 0){
currentNode = currentNode.previousNode;
count--;
}
return currentNode;
}
public boolean insert(Student student, int index){
Node<Student> currentNode;
if (this.getNode(index) != null)
{
Node<Student> newNode = new Node<Student>(student);
currentNode = this.getNode(index);
newNode.index = index;
if (null != currentNode.previousNode)
{
currentNode.previousNode.nextNode = newNode;
newNode.previousNode = currentNode.previousNode;
}
currentNode.previousNode = newNode;
newNode.nextNode = currentNode;
currentNode = newNode;
while (currentNode.nextNode != null)
{
currentNode = currentNode.nextNode;
currentNode.index++;
}
this.nodeCount++;
return true;
}
else
{
return false; // error handling
}
}
public boolean remove(int index){
Node<Student> currentNode;
if (this.getNode(index) != null){
currentNode = this.getNode(index);
if(currentNode.previousNode != null) {
currentNode.nextNode.previousNode = currentNode.previousNode;
currentNode.previousNode.nextNode = currentNode.nextNode;
} else if (currentNode.nextNode != null){
currentNode.nextNode.previousNode = null;
} else if (this.isEmpty()){
this.lastNode = null;
}
while (currentNode.nextNode != null){
currentNode = currentNode.nextNode;
currentNode.index--;
}
this.nodeCount--;
return true;
}else {
return false;
}
}
private static class Node<Student>{
public Node<Student> nextNode = null;
public Node<Student> previousNode = null;
public int index;
public Student student;
public Node(Student student){
this.student = student;
}
}
}
請編輯您的問題我包括一個單獨關注單個問題的[mcve]。 – trashgod