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。（在这个简化的版本参数并不重要，只是＆＃34;模式＆＃34;，实际上我从记录集中填充它。）我想要

1.最初填写对话窗口中的表

可选择使用按钮显示另一组数据，使用不同模式检索

第一个任务是好的。创建表和填充按程序组织从对话框构造函数正常工作。但是当我从按钮的ActionListener运行这个过程时 - 我在同一个窗口中得到另一个表副本 - 这是有意义的，因为我再次创建它作为＆＃34; new＆＃34;。我找不到可以在同一张桌子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JTable方法中创建GetHistoryByMode，而是在构造函数中创建它并将其添加到UI中。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

请查看How to Use Tables了解详情

您可能还希望阅读Code Conventions for the Java TM Programming Language，这样可以让人们更轻松地阅读您的代码并让您阅读其他代码

补充JTable来自

1 个答案: