java - 从以下位置重新填充 JTable

Question

我从主窗口打开 JDialog 以显示根据参数和模式检索的数据集。(在这个简化版本中参数并不重要，只是“模式”，实际上我从记录集中填充它)。我想要

1.首先在对话框窗口中填充表格

可选择使用按钮显示另一组数据，以不同模式检索

第一个任务没问题。创建表格和填充按程序组织从对话框构造函数可以正常工作。但是，当我从按钮的 ActionListener 运行此过程时 - 我在同一窗口中获得了表的另一个副本 - 这是有意义的，因为我再次将其创建为"new"。我找不到在同一张表上重新填充数据的方法!网上的所有示例都是关于创建一个新的

这里是调用部分

btnFreqHistory.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                System.out.println("Running history");
                DlgFreqHistory FreqHist= new DlgFreqHistory(1000,2,1 );
                FreqHist.setDefaultCloseOperation(FreqHist.DISPOSE_ON_CLOSE);
                FreqHist.setVisible(true);  

            }
        });

这是 JDialog 部分:

import java.awt.BorderLayout;
import java.awt.FlowLayout;
import java.awt.event.*;

import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.border.EmptyBorder;
import javax.swing.JTable;


import java.sql.ResultSet;


public class DlgFreqHistory extends JDialog {

    private final JPanel contentPanel = new JPanel();


    static int Freq;
    static int Side;
    static int Mode; //1- last 10 results, 2 - best  results


    /**
     * Launch the application.
     */
    public static void main(String[] args) {


    }

    /**
     * Create the dialog.
     */
    public DlgFreqHistory(int iFreq, int iSide, int iMode) {

        Freq = iFreq;
        Side = iSide;
        Mode = iMode;
        setBounds(100, 100, 450, 300);
        getContentPane().setLayout(new BorderLayout());
        contentPanel.setLayout(new FlowLayout());
        contentPanel.setBorder(new EmptyBorder(5, 5, 5, 5));
        getContentPane().add(contentPanel, BorderLayout.CENTER);
        this.setTitle("Last results for " + iFreq  );
        **// !! This call works fine**
        GetHistoryByMode(iFreq, iSide, 2);

            JPanel buttonPane = new JPanel();
            buttonPane.setLayout(new FlowLayout(FlowLayout.RIGHT));
            getContentPane().add(buttonPane, BorderLayout.SOUTH);

                JButton btn_getData = new JButton("Get data");
                btn_getData.addActionListener(new ActionListener() {
                    public void actionPerformed(ActionEvent e){
                        System.out.println("in action performed");
                        ***// !! This call creates another table***
                        GetHistoryByMode(Freq, Side, 1);
                    }
                }   );

                buttonPane.add(btn_getData);
                getRootPane().setDefaultButton(btn_getData);


    }

    private void GetHistoryByMode(int Freq, int iSide, int Mode)
    {
        System.out.println("in GetHistoryByMode " + Freq + "  " + iSide + "  " + Mode);

        String HistColumns[] = new String[2];
        String HistData[][] = new String[10][2];

        if (Mode==1) { 
            HistColumns[0] = "X1";
            HistColumns[1] =  "Result";
            HistData[0][0] = "xx1";
            HistData[0][1] = "15";
            HistData[1][0] = "xx2";
            HistData[1][1] = "20";

        }
        if (Mode==2) { 
            HistColumns[0] = "Y1";
            HistColumns[1] =  "Result";
            HistData[0][0] = "yy1";
            HistData[0][1] = "15";
            HistData[1][0] = "yy2";
            HistData[1][1] = "23";
        }

        JTable FreqHistory = new JTable(HistData, HistColumns);
        contentPanel.add(FreqHistory);
        JScrollPane scrollPane;
        scrollPane = new JScrollPane( FreqHistory );
        contentPanel.add( scrollPane, BorderLayout.CENTER );
     }
}

Answer 1

不要在 GetHistoryByMode 方法中创建 JTable，而是在构造函数中创建它并将其添加到那里的 UI。然后在 GetHistoryByMode 方法中，创建一个新的 TableModel 并将其应用 (setModel) 到现有的 JTable

看看How to Use Tables了解更多详情

您可能还想通读Code Conventions for the Java TM Programming Language ，这将使人们更容易阅读您的代码，也让您更轻松地阅读其他人