jtable仅使用链表中的值填充一行
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所以我有这个班级，里面有员工的姓名，地址和城市。之后，类被存储在链表中，当用户在文本字段中输入名称，地址和城市时，值将被插入到链表中，然后填充到jtable上。到目前为止，我已经能够获取用户详细信息并将其添加到likeslist中，但是当我单击添加按钮时，它只向表中添加一行，如果我在文本字段中插入一些其他值并单击addbutton再次，它只是删除以前添加的行并添加新的仍然只显示一行，我希望jtable显示所有值。这是我的代码。
public class EmployeeDetails extends javax.swing.JFrame {
String [] str = {"NAME", "ADDRESS", "CITY", "ZICODE"};
LinkedList<EmployeeDetails> linkedlist;
String name;
String address;
String city;
String zipcode;
public EmployeeDetails(String name, String address, String city, String zipcode) {
this.name = name;
this.address = address;
this.city = city;
this.zipcode = zipcode;
}
public void setName(String name) {
this.name = name;
}
public String getName() {
return name;
}
public void setAddres(String address) {
this.address = address;
}
public String getAddress() {
return address;
}
public void setCity(String city) {
this.city = city;
}
public String getCity() {
return city;
}
public void setZip(String zipcode) {
this.zipcode = zipcode;
}
public String getZip() {
return zipcode;
}
public String toString() {
return name + " " + address + " " + city + " " + zipcode;
}
public EmployeeDetails() {
initComponents();
}
//this is the method that does the adding
public void add() {
name = nametxt.getText().trim();
address = addresstxt.getText().trim();
city = citytxt.getText().trim();
zipcode = zipcodetxt.getText().trim();
linkedlist = new LinkedList<>();
linkedlist.add(new EmployeeDetails(name, address, city, zipcode));
DefaultTableModel model = new DefaultTableModel(str, linkedlist.size());
for(EmployeeDetails details : linkedlist) {
System.out.println(details);
model.addRow(new Object[]{details.getName()details.getAddress(), details.getCity(), details.getZip()});
}
employeeTable.setModel(model);
}
}
答案
看看你的add方法。它创建了一个新的LinkedList添加单个EmployeeDetails（从JFrame延伸!!这不会很好地结束），创建一个新的TableModel并添加（单个）EmployeeDetails到它然后将其应用到employeeTable ...为什么你有意外吗？
EmployeeDetails没有理由从基于UI的组件扩展，它为您提供零利益。 EmployeeDetails类也不负责以任何形式或形式管理UI。
面向对象开发的一个关键方面是责任分离。 EmployeeDetails应该管理员工的详细信息，没有别的...
public class EmployeeDetails {
String name;
String address;
String city;
String zipcode;
public EmployeeDetails(String name, String address, String city, String zipcode) {
this.name = name;
this.address = address;
this.city = city;
this.zipcode = zipcode;
}
public void setName(String name) {
this.name = name;
}
public String getName() {
return name;
}
public void setAddres(String address) {
this.address = address;
}
public String getAddress() {
return address;
}
public void setCity(String city) {
this.city = city;
}
public String getCity() {
return city;
}
public void setZip(String zipcode) {
this.zipcode = zipcode;
}
public String getZip() {
return zipcode;
}
public String toString() {
return name + " " + address + " " + city + " " + zipcode;
}
}
虽然DefaultTableModel是一个强大而灵活的模型，但它也有点基础。对我来说，我更喜欢可以管理它所显示的对象的东西，并且可以更好地决定它们应该如何显示。对于模型可变状态（应该允许添加，删除甚至编辑各行？），这甚至更为关键？
在您的情况下，您希望能够至少添加新的EmployeeDetails对象...
public static class EmployeeTableModel extends AbstractTableModel {
protected static String [] COLUMN_NAMES = {"NAME", "ADDRESS", "CITY", "ZICODE"};
private List<EmployeeDetails> rows = new ArrayList<>(25);
@Override
public int getRowCount() {
return rows.size();
}
@Override
public int getColumnCount() {
return COLUMN_NAMES.length;
}
@Override
public String getColumnName(int column) {
return COLUMN_NAMES[column];
}
@Override
public Object getValueAt(int rowIndex, int columnIndex) {
EmployeeDetails ed = rows.get(rowIndex);
switch (columnIndex) {
case 0: return ed.getName();
case 1: return ed.getAddress();
case 2: return ed.getCity();
case 3: return ed.getZip();
}
return null;
}
public void add(EmployeeDetails ed) {
rows.add(ed);
int row = rows.size() - 1;
fireTableRowsInserted(row, row);
}
public void remove(EmployeeDetails ed) {
int row = rows.indexOf(ed);
if (row < 0) {
return;
}
}
public void remove(int row) {
if (row < 0 || row > rows.size()) {
return;
}
rows.remove(row);
fireTableRowsInserted(row, row);
}
}
除了管理模型的状态之外，模型不做任何其他事情。我更复杂的解决方案可能有一个额外的模型/控制器来管理如何创建新对象以及更新或删除现有对象，但我会将其留给您添加。
最后，我们可以将它们拼接在一起......
public class TestPane extends JPanel {
private EmployeeTableModel model = new EmployeeTableModel();
public TestPane() {
setLayout(new BorderLayout());
add(new JScrollPane(new JTable(model)));
JButton add = new JButton("Add");
add.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
int row = model.getRowCount();
EmployeeDetails ed = new EmployeeDetails("Employee " + row, "@ " + row, "Metro" + row, Integer.toString(row));
model.add(ed);
}
});
add(add, BorderLayout.SOUTH);
}
}
一个带按钮和桌子的简单面板，现在您可以混合添加按钮并观察您的员工名单增长...希望您有充足的资金;）
请确保您花时间阅读How to Use Tables，其中包含许多重要且相关的信息以及您可以使用的可运行示例
Runnable example...
import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;
import java.util.List;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.AbstractTableModel;
public class Test {
public static void main(String[] args) {
new Test();
}
public Test() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
JFrame frame = new JFrame();
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
private EmployeeTableModel model = new EmployeeTableModel();
public TestPane() {
setLayout(new BorderLayout());
add(new JScrollPane(new JTable(model)));
JButton add = new JButton("Add");
add.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
int row = model.getRowCount();
EmployeeDetails ed = new EmployeeDetails("Employee " + row, "@ " + row, "Metro" + row, Integer.toString(row));
model.add(ed);
}
});
add(add, BorderLayout.SOUTH);
}
}
public static class EmployeeTableModel extends AbstractTableModel {
protected static String [] COLUMN_NAMES = {"NAME", "ADDRESS", "CITY", "ZICODE"};
private List<EmployeeDetails> rows = new ArrayList<>(25);
@Override
public int getRowCount() {
return rows.size();
}
@Override
public int getColumnCount() {
return COLUMN_NAMES.length;
}
@Override
public String getColumnName(int column) {
return COLUMN_NAMES[column];
}
@Override
public Object getValueAt(int rowIndex, int columnIndex) {
EmployeeDetails ed = rows.get(rowIndex);
switch (columnIndex) {
case 0: return ed.getName();
case 1: return ed.getAddress();
case 2: return ed.getCity();
case 3: return ed.getZip();
}
return null;
}
public void add(EmployeeDetails ed) {
rows.add(ed);
int row = rows.size() - 1;
fireTableRowsInserted(row, row);
}
public void remove(EmployeeDetails ed) {
int row = rows.indexOf(ed);
if (row < 0) {
return;
}
}
public void remove(int row) {
if (row < 0 || row > rows.size()) {
return;
}
rows.remove(row);
fireTableRowsInserted(row, row);
}
}
public class EmployeeDetails {
String name;
String address;
String city;
String zipcode;
public EmployeeDetails(String name, String address, String city, String zipcode) {
this.name = name;
this.address = address;
this.city = city;
this.zipcode = zipcode;
}
public void setName(String name) {
this.name = name;
}
public String getName() {
return name;
}
public void setAddres(String address) {
this.address = address;
}
public String getAddress() {
return address;
}
public void setCity(String city) {
this.city = city;
}
public String getCity() {
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