英文:
Java JTable changes when click on JButton
问题
我有一个带有表的数据库。我将表的名称传递给按钮。当您点击时，需要出现一个带有字段和填充的表。问题是，每次单击按钮时我都会添加一个新表。
有人可以告诉我如何做吗？提前谢谢！
public class App extends JPanel {
static List<FieldElement> fields = new ArrayList<>();
static List<Map<String, Object>> data = new ArrayList<>();
static JTable jTable = new JTable();
public static void createGUI() throws SQLException {
TableContent tableContent = new TableContent();
JFrame frame = new JFrame();
MetadataHelper databaseMetadata = new MetadataHelper();
List<ButtonElement> elements = databaseMetadata.showTables();
JPanel panel = new JPanel();
JPanel buttons = new JPanel(new GridLayout(0, 1));
for (ButtonElement buttonElements : elements) {
JButton jButton = new JButton(buttonElements.getTablesInMigrateSchema());
buttons.add(jButton);
jButton.addActionListener(new ActionListener() {
@SneakyThrows
@Override
public void actionPerformed(ActionEvent e) {
fields = tableContent.getDatabaseMetadata().showFields(buttonElements.getTablesInMigrateSchema());
data = tableContent.getDatabaseMetadata().selectAll(buttonElements.getTablesInMigrateSchema());
Object[][] objectRows = data.stream().map(m -> m.values().toArray()).toArray(Object[][]::new);
jTable = new JTable(objectRows, fields.toArray());
panel.add(new JScrollPane(jTable));
frame.revalidate();
frame.repaint();
}
});
}
panel.add(buttons, BorderLayout.EAST);
frame.add(panel);
frame.setTitle("SwingSandbox");
frame.setLocationRelativeTo(null);
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.pack();
}
public static void main(String[] args) {
javax.swing.SwingUtilities.invokeLater(new Runnable() {
@SneakyThrows
public void run() {
JFrame.setDefaultLookAndFeelDecorated(true);
createGUI();
}
});
}
}
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英文:
I have a database with tables. I passed the name of the tables into the buttons. When you click, you need a table with fields and filling to appear. The problem is that I have a new table added every time I click on the button.
Can someone please say me how to do it? Thanks in advance!
public class App extends JPanel {
static List<FieldElement> fields = new ArrayList<>();
static List<Map<String, Object>> data = new ArrayList<>();
static JTable jTable = new JTable();
public static void createGUI() throws SQLException {
TableContent tableContent = new TableContent();
JFrame frame = new JFrame();
MetadataHelper databaseMetadata = new MetadataHelper();
List<ButtonElement> elements = databaseMetadata.showTables();
JPanel panel = new JPanel();
JPanel buttons = new JPanel(new GridLayout(0, 1));
for (ButtonElement buttonElements : elements) {
JButton jButton = new JButton(buttonElements.getTablesInMigrateSchema());
buttons.add(jButton);
jButton.addActionListener(new ActionListener() {
@SneakyThrows
@Override
public void actionPerformed(ActionEvent e) {
fields = tableContent.getDatabaseMetadata().showFields(buttonElements.getTablesInMigrateSchema());
data = tableContent.getDatabaseMetadata().selectAll(buttonElements.getTablesInMigrateSchema());
Object[][] objectRows = data.stream().map(m -> m.values().toArray()).toArray(Object[][]::new);
jTable = new JTable(objectRows, fields.toArray());
panel.add(new JScrollPane(jTable));
frame.revalidate();
frame.repaint();
}
});
}
panel.add(buttons, BorderLayout.EAST);
frame.add(panel);
frame.setTitle("SwingSandbox");
frame.setLocationRelativeTo(null);
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.pack();
}
public static void main(String[] args) {
javax.swing.SwingUtilities.invokeLater(new Runnable() {
@SneakyThrows
public void run() {
JFrame.setDefaultLookAndFeelDecorated(true);
createGUI();
}
});
}
}
答案1
得分: 1
一种简单的方法是将JScrollPane存储在一个变量中（该变量保存您想要移除的表格）：
static JTable jTable = new JTable();
static JScrollPane jScrollPane;
然后在您的actionPerformed方法中：
public void actionPerformed(ActionEvent e) {
...
if (jScrollPane != null) {
panel.remove(jScrollPane);
}
jTable = new JTable(objectRows, fields.toArray());
jScrollPane = new JScrollPane(jTable);
panel.add(jScrollPane);
frame.revalidate();
frame.repaint();
}
英文:
One easy possibility is to store the JScrollPane in a variable (which holds your table that you want to remove):
static JTable jTable = new JTable();
static JScrollPane jScrollPane;
And then in your actionPerformed method:
public void actionPerformed(ActionEvent e) {
...
if (jScrollPane != null) {
panel.remove(jScrollPane);
}
jTable = new JTable(objectRows, fields.toArray());
jScrollPane = new JScrollPane(jTable);
panel.add(jScrollPane);
frame.revalidate();
frame.repaint();
}
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