当我单击名为“已注册主题”的按钮时，将调用一个显示已注册主题的表格。数据是从文本文件加载的。但是，当我转到应用程序的另一个页面并返回到“已注册主题”或再次单击“已注册主题”按钮时，会加载一个新表并将其添加到之前加载的表中。这使得每次我单击“已注册主题”时表格都会变长。我添加了一个removeAll()方法，该方法在再次加载表之前清除 Pane 的内容，但由于某种原因，先前加载的表不会消失。
这是附加表格的面板的代码。
public class EnrolledSubjectsPanel extends JPanel
{
public EnrolledSubjectsPanel(String path)
{
setBackground(Color.LIGHT_GRAY);
setBounds(183, 280, 1129, 401);
setLayout(null);
LoadTable table = new LoadTable(path);
table.setBounds(0,60,1129,600);
add(table);
JLabel lblEnrolledSubjects = new JLabel("Enrolled Subjects");
lblEnrolledSubjects.setFont(new Font("Tahoma", Font.PLAIN, 35));
lblEnrolledSubjects.setBounds(446, 0, 292, 43);
add(lblEnrolledSubjects);
setVisible(true);
}
}
创建表的类
public class LoadTable extends JPanel
{
private static String path;
private static String header[] = {"Subject", "Schedule", "Room", "Proferssor", "Units"};
private static DefaultTableModel dtm = new DefaultTableModel(null, header);
boolean isLaunched;
public LoadTable(String path)
{
this.path = "subjects" + path;
setBackground(Color.LIGHT_GRAY);
setBounds(183, 280, 1129, 401);
setLayout(null);
JTable table = new JTable(dtm);
JScrollPane jsp = new JScrollPane(table);
jsp.setBounds(0, 0, 1129, 380);
add(jsp);
try
{
TextReaderBasic file = new TextReaderBasic(path);
String data[] = file.openFile();
int i = 0;
for(i = 0; i <= data.length; i++)
{
addRow(i);
}
}
catch(Exception e)
{
System.out.println(e.getMessage());
}
setVisible(true);
}
public static void addRow(int x)
{
try
{
TextReaderBasic file = new TextReaderBasic(path);
String data[] = file.openFile();
int size = data.length;
int i = 0 + x;
int j = 6 + x;
int k = 12 + x;
int l = 18 + x;
int m = 24 + x;
dtm.addRow(new Object[]{data[i], data[j], data[k], data[l], data[m]});
}
catch(Exception e)
{
System.out.println("Action completed :)");
}
}
}
面板附加到的主类
public class LaunchPage extends JFrame
{ public LaunchPage(String path)
{
getContentPane().setBackground(Color.white);
getContentPane().setLayout(null);
StudentBasicInformationPanel studentBasicInfo = new StudentBasicInformationPanel(path);
getContentPane().add(studentBasicInfo);
JLabel universityTitleL = new JLabel("Evil Genuises University");
universityTitleL.setFont(new Font("Edwardian Script ITC", Font.ITALIC, 42));
universityTitleL.setBounds(514, 11, 343, 65);
getContentPane().add(universityTitleL);
JPanel panelToAttach = new JPanel();
panelToAttach.setBounds(173, 280, 1129, 404);
getContentPane().add(panelToAttach);
setSize(1366, 768);
JButton enrollmentButton = new JButton("Enrollment");
enrollmentButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0)
{
panelToAttach.removeAll();
EnrollmentPanel ep = new EnrollmentPanel();
ep.setBackground(Color.LIGHT_GRAY);
ep.setBounds(0, 0, 1129, 401);
panelToAttach.add(ep);
repaint();
}
});
enrollmentButton.setBounds(10, 280, 157, 58);
getContentPane().add(enrollmentButton);
JButton viewEnrolledSubjectsButton = new JButton("Enrolled Subjects");
viewEnrolledSubjectsButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0)
{
panelToAttach.removeAll();
EnrolledSubjectsPanel es = new EnrolledSubjectsPanel(path);
es.setBackground(Color.LIGHT_GRAY);
es.setBounds(0, 0, 1129, 401);
panelToAttach.add(es);
repaint();
}
});
viewEnrolledSubjectsButton.setBounds(10, 349, 157, 58);
getContentPane().add(viewEnrolledSubjectsButton);
JButton viewGradesButton = new JButton("View Grades");
viewGradesButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0)
{
panelToAttach.removeAll();
GradesPanel gp = new GradesPanel();
gp.setBackground(Color.LIGHT_GRAY);
gp.setBounds(0, 0, 1129, 401);
panelToAttach.add(gp);
repaint();
}
});
viewGradesButton.setBounds(10, 418, 157, 58);
getContentPane().add(viewGradesButton);
JButton clearanceButton = new JButton("Clearance");
clearanceButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0)
{
panelToAttach.removeAll();
ClearancePanel cp = new ClearancePanel();
cp.setBackground(Color.LIGHT_GRAY);
cp.setBounds(0, 0, 1129, 401);
panelToAttach.add(cp);
repaint();
}
});
clearanceButton.setBounds(10, 487, 157, 58);
getContentPane().add(clearanceButton);
JButton viewAccountButton = new JButton("View Account");
viewAccountButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0)
{
panelToAttach.removeAll();
AccountPanel ap = new AccountPanel();
ap.setBackground(Color.LIGHT_GRAY);
ap.setBounds(0, 0, 1129, 401);
panelToAttach.add(ap);
repaint();
}
});
viewAccountButton.setBounds(10, 556, 157, 58);
getContentPane().add(viewAccountButton);
JButton closeButton = new JButton("Close");
closeButton.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
System.exit(0);
}
});
closeButton.setBounds(10, 626, 157, 58);
getContentPane().add(closeButton);
setVisible(true);
}
}
提前致谢!
最佳答案
在将行添加到表中之前，请尝试在 LoadTable 类中使用以下代码。它将清除表模型中的行。
dtm.setRowCount(0);
因此，您的新 LoadTable 类应如下所示:
public class LoadTable extends JPanel
{
private static String path;
private static String header[] = {"Subject", "Schedule", "Room", "Proferssor", "Units"};
private static DefaultTableModel dtm = new DefaultTableModel(null, header);
dtm.setRowCount(0); //THIS WILL CLEAR THE ROWS IN YOUR STATIC TABLEMODEL
boolean isLaunched;
public LoadTable(String path)
{
this.path = "subjects" + path;
setBackground(Color.LIGHT_GRAY);
setBounds(183, 280, 1129, 401);
setLayout(null);
JTable table = new JTable(dtm);
JScrollPane jsp = new JScrollPane(table);
jsp.setBounds(0, 0, 1129, 380);
add(jsp);
try
{
TextReaderBasic file = new TextReaderBasic(path);
String data[] = file.openFile();
int i = 0;
for(i = 0; i <= data.length; i++)
{
addRow(i);
}
}
catch(Exception e)
{
System.out.println(e.getMessage());
}
setVisible(true);
}
public static void addRow(int x)
{
try
{
TextReaderBasic file = new TextReaderBasic(path);
String data[] = file.openFile();
int size = data.length;
int i = 0 + x;
int j = 6 + x;
int k = 12 + x;
int l = 18 + x;
int m = 24 + x;
dtm.addRow(new Object[]{data[i], data[j], data[k], data[l], data[m]});
}
catch(Exception e)
{
System.out.println("Action completed :)");
}
}
}
关于java - 表的前一个实例会追加到新调用的表中。页面应该只显示一张表，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/35766440/