我的JTable头不会显示，即使将其添加到像JScrollPane这样的容器中……告诉我为什么会发生这种情况，我如何修复或调试它……我在互联网上搜索，他们所说的只是将容器添加到您的jtable中，我做了，但仍然没有显示我的头。
public void table(){
try{
rs = stat.executeQuery("SELECT * FROM payments;");
Vector<String> header = new Vector<String>();
header.add("PAYMENT");
header.add("AMOUNT");
header.add("MODIFIER");
header.add("DATE MODIFIED");
Vector<Vector<Object>> data = new Vector<Vector<Object>>();
while(rs.next()) {
Vector<Object> row = new Vector<Object>();
row.add(rs.getString("description"));
row.add(rs.getString("amount"));
row.add(rs.getString("remarks"));
row.add(rs.getString("date"));
data.add(row);
} // loop
table = new JTable(data, header);
JScrollPane scrollPane = new JScrollPane(table);
panel.add(table);
panel.add(table.getTableHeader());
//panel.removeAll();
//scroll.add(table);
validate();
}catch(Exception e){
System.out.println("Error in table: "+e);
}//try and catch
}
从移除开始
panel.add(table.getTableHeader());
JTable旨在将其标头添加到JScrollPane。一个组件的实例只能属于一个父级/容器，上面一行是从滚动窗格中删除它
另外，改变这个…
panel.add(table);
到
panel.add(scrollPane);
我面临的同样问题您必须将JTable添加到JScrollPane，然后将JscrollPane添加到JFrame，例如。
JTable table = new JTable();
JScrollPane scrollPane= new JScrollPane(table);
frame.add(scrollPane);
使用动态数据的最佳JTable示例（只需粘贴在编辑器中并作为Java应用程序执行即可顺利工作）：
import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.DefaultTableModel;
public class TableTest {
private JFrame frame;
private JTable table;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
TableTest window = new TableTest();
window.frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the application.
*/
public TableTest() {
initialize();
}
/**
* Initialize the contents of the frame.
*/
private void initialize() {
frame = new JFrame();
frame.setBounds(100, 100, 450, 300);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().setLayout(null);
table = new JTable();
DefaultTableModel daDefaultTableModel = new DefaultTableModel(0, 0);
String[] columnNames = new String[] {"Column Header1", "Column Header2", "Column Header3"};
daDefaultTableModel.setColumnIdentifiers(columnNames);
//Dummy data for Table
daDefaultTableModel.addRow(new Object[] {"Test1","Test2","Test3"});
daDefaultTableModel.addRow(new Object[] {"Test2","Test2","Test3"});
daDefaultTableModel.addRow(new Object[] {"Test3","Test2","Test3"});
daDefaultTableModel.addRow(new Object[] {"Test4","Test2","Test3"});
daDefaultTableModel.addRow(new Object[] {"Test5","Test2","Test3"});
daDefaultTableModel.addRow(new Object[] {"Test6","Test2","Test3"});
daDefaultTableModel.addRow(new Object[] {"Test7","Test2","Test3"});
daDefaultTableModel.addRow(new Object[] {"Test8","Test2","Test3"});
daDefaultTableModel.addRow(new Object[] {"Test9","Test2","Test3"});
daDefaultTableModel.addRow(new Object[] {"Test10","Test2","Test3"});
daDefaultTableModel.addRow(new Object[] {"Test11","Test2","Test3"});
daDefaultTableModel.addRow(new Object[] {"Test12","Test2","Test3"});
daDefaultTableModel.addRow(new Object[] {"Test13","Test2","Test3"});
daDefaultTableModel.addRow(new Object[] {"Test14","Test2","Test3"});
daDefaultTableModel.addRow(new Object[] {"Test15","Test2","Test3"});
daDefaultTableModel.addRow(new Object[] {"Test16","Test2","Test3"});
daDefaultTableModel.addRow(new Object[] {"Test17","Test2","Test3"});
daDefaultTableModel.addRow(new Object[] {"Test18","Test2","Test3"});
daDefaultTableModel.addRow(new Object[] {"Test19","Test2","Test3"});
table.setModel(daDefaultTableModel);
JScrollPane scrollPane = new JScrollPane(table);
scrollPane.setBounds(10, 38, 414, 212);
frame.getContentPane().add(scrollPane);
}
}
