为什么fireTableStructureChanged（）不更新我的表？

Question

public class MyTableModel extends AbstractTableModel{
JComboBox box;
public MyTableModel(JComboBox choice){
    super();
    box = choice;
}

public void updateTable(){
    this.fireTableStructureChanged();
}

@Override
public int getColumnCount() {
    //implemented
}

@Override
public int getRowCount() {
    //implemented
}

@Override
public Object getValueAt(int row, int col) {
    //implemented
}

choice5是一个JComboBox

    table1 = new JTable(new MyTableModel(choice5));

从choice5中选择项目时

    ((MyTableModel)table1.getModel()).updateTable();

被称为（编辑：对于我可以选择的每个项目，我可能有一个不同的jtable我想要显示）

编辑（SSCCE）：

import java.awt.BorderLayout;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JTable;

public class TestTableModel extends JFrame {
 static JComboBox<String> choice5 = new JComboBox<String>(new String[]{"","1","2","3"});
 static JTable table1 = new JTable(new MyTableModel(choice5));
 static JFrame frame = new JFrame();

 public static void main(String[] args) {
    frame.setLayout(new BorderLayout());
    choice5.addItemListener(new ItemListener(){
        @Override
        public void itemStateChanged(ItemEvent e) {
            if(e.getStateChange() == ItemEvent.SELECTED) {
                ((MyTableModel)table1.getModel()).updateTable();
                frame.pack();
            }}});
    frame.add(BorderLayout.SOUTH, choice5);
    frame.add(BorderLayout.CENTER, table1);
    frame.pack();
    frame.setVisible(true);
    frame.setDefaultCloseOperation(EXIT_ON_CLOSE);
    }
}

MyTableModel

import javax.swing.JComboBox;
import javax.swing.table.AbstractTableModel;
public class MyTableModel extends AbstractTableModel{
 JComboBox box;

public MyTableModel(JComboBox choice){
    super();
    box = choice;
}
public void updateTable(){this.fireTableStructureChanged();}

@Override
public int getColumnCount() {return box.getSelectedIndex();}
@Override
public int getRowCount() { return box.getSelectedIndex();}
@Override
public Object getValueAt(int row, int col) {return box.getSelectedItem();}
}

Answer 1

表结构是行、列和列头。表格数据显示在单元格中。

>

尝试使用FireTableRowsupDated:

 public void updateTable(){this.fireTableRowsUpdated(0, this.getRowCount() - 1);}

尝试使用SetModel并使用EventQueue确保您的代码在UI线程上执行：

 choice5.addItemListener(new ItemListener(){
     @Override
     public void itemStateChanged(ItemEvent e) {
         if(e.getStateChange() == ItemEvent.SELECTED) {
             EventQueue.invokeLater(() -> {
                 table1.setModel(new MyTableModel(choice5));
                 frame.pack();
             });
         }}});

在JScrollPane中尝试您的JTable。它们之间有魔力，就像巧克力和花生酱：

 frame.add(BorderLayout.SOUTH, choice5);
 frame.add(BorderLayout.CENTER, new JScrollPane(table1));

火化的

null

来源：Oracle

可燃烧的结构改变的

public void fireTableStructureChanged()