Java 删除行后未重新绘制JTable
AdminFrame.javaJava 删除行后未重新绘制JTable,java,swing,jtable,Java,Swing,Jtable,AdminFrame.java package com.sorcerok; import java.awt.Color; import java.awt.Font; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.util.ArrayList; import java.util.List; import javax.swing.JButton; import javax
package com.sorcerok;
import java.awt.Color;
import java.awt.Font;
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.event.TableModelListener;
import javax.swing.table.AbstractTableModel;
import javax.swing.table.JTableHeader;
public class AdminFrame extends JFrame {
private JFrame frame;
private JPanel panel;
private JButton delete, change;
private JTable usersTable;
private static final int WIDTH = 510;
private static final int HEIGHT = 300;
private List<User> list;
private MyTableModel model;
public AdminFrame(JFrame frame) {
super("Просмотр пользователей");
setResizable(false);
this.frame = frame;
frame.setVisible(false);
panel = new JPanel();
frame.setResizable(false);
panel.setLayout(null);
delete = new JButton("Удалить");
delete.setBounds(310, 230, 121, 30);
change = new JButton("Изменить");
change.setBounds(50, 230, 121, 30);
list = new ArrayList<>(Authorisation.userMap.values());
model = new MyTableModel(list);
usersTable = new JTable(model);
JTableHeader header = usersTable.getTableHeader();
header.setForeground(Color.black);
header.setFont(new Font("Times New Roman", Font.BOLD, 20));
JScrollPane sp = new JScrollPane(usersTable);
sp.setBounds(0, 0, 500, 90);
panel.add(delete);
panel.add(change);
panel.add(sp);
add(panel);
setSize(WIDTH, HEIGHT);
setDefaultCloseOperation(DISPOSE_ON_CLOSE);
setLocationRelativeTo(null);
setVisible(true);
}
public void dispose() {
frame.setVisible(true);
super.dispose();
}
public void deleteFromTable() {
delete.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
int row = usersTable.getSelectedRow();
if (getSelectedUser(row) != null) {
Authorisation.userMap.remove(getSelectedUser(row).getName());
list.remove(getSelectedUser(row));
System.out.println(list);
Registration.writeToFile();
model.removeRow(row);
}
}
});
}
public User getSelectedUser(int index) {
index = usersTable.getSelectedRow();
if (isSelectedUser(index)) {
String name = (String) usersTable.getValueAt(index, 1);
return getUser(name);
} else {
return null;
}
}
public boolean isSelectedUser(int index) {
if (index < 0) {
return false;
} else {
return true;
}
}
public User getUser(String name) {
for (User u : list) {
if (name.equals(u.getName())) {
return u;
}
}
return null;
}
public class MyTableModel extends AbstractTableModel {
private List<User> list;
private MyTableModel(List<User> list) {
this.list = list;
}
public void addTableModelListener(TableModelListener listener) {
}
public Class<?> getColumnClass(int columnIndex) {
return String.class;
}
public int getColumnCount() {
return 3;
}
public String getColumnName(int columnIndex) {
switch (columnIndex) {
case 0:
return "№";
case 1:
return "Логин";
case 2:
return "Пароль";
}
return "";
}
public int getRowCount() {
return list.size();
}
public Object getValueAt(int rowIndex, int columnIndex) {
User user = list.get(rowIndex);
switch (columnIndex) {
case 0:
return ++rowIndex;
case 1:
return user.getName();
case 2:
return user.getPassword();
}
return "";
}
public boolean isCellEditable(int rowIndex, int columnIndex) {
return false;
}
public void removeTableModelListener(TableModelListener listener) {
}
public void setValueAt(Object value, int rowIndex, int columnIndex) {
}
public void removeRow(int row) {
fireTableRowsDeleted(row, row);
fireTableStructureChanged();
System.out.println("Deleted by AbstractTableModel Table Model");
}
}
}
当表格中有很多元素且存在滚动时,即按删除一行,该行立即从Arralist中删除,但未从表格中删除,如果使用滚动,记录立即消失。没有此方法模型的相同函数。removeRow(行);什么是wrang?您的表模型不支持
TableModelListeners
,这就是为什么表无法观察模型上的更改
您的TableModel应该在更改时通知TableModelListeners
(当添加、删除或刷新行时)在表格上设置模型时,表格将向模型添加一个
TableModelListener
。一旦模型更改,它将触发一个TableModelEvent
(通过在所有侦听器上调用tableChanged(TableModelEvent)
)。然后,JTable
将收到此通知,重新验证并重新绘制表格内容以适应更改
在您的具体案例中:
您已经重写了
添加| removeTableModelListener()
方法,因此无法注册任何侦听器。只需删除模型上的这两个方法,并让DefaultTableModel
对这些方法的实现来处理它。无关:不要对组件进行任何手动大小调整/定位,这是合适的LayoutManagerFirst的独有任务,我想修复delete函数,非常感谢您在我使用DefaultTableModel并从DefaultTableModel调用removeRow方法时它的工作
AdminFrame af = new AdminFrame(frame);
af.deleteFromTable();