JTable更新，刷新或重绘

Question

我有简单的程序，我希望从CSV加载数据并添加到JTable。按钮加载数据用于启动加载序列并将数据获取到表。加载到表工作正常但刷新表不起作用。我尝试重新验证并重新绘制，但这不起作用。调试程序显示数据是插入JTable对象但不显示。

这是我的App2.java类

    package com.App;

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ComponentAdapter;
import java.awt.event.ComponentEvent;
import java.util.Arrays;

public class App2 extends Data {
    private JTable tableview;
    private JButton deleteAllSpacesButton;
    private JButton checkPSCButton;
    private JButton insertRowButton;
    private JButton loadDataButton;
    private JProgressBar progressBar1;
    private JButton button5;
    private JPanel panelMain;
    private JScrollPane scrollingwindow;


    private JFrame frame;
    //top panel
    private JMenuBar menuBar;

    private JMenu fileMenu=new JMenu("File");
    private JMenu editMenu=new JMenu("Edit");
    private JMenu helpMenu=new JMenu("Help");

    private JMenuItem [] fileMenuItems={new JMenuItem("New"),new JMenuItem("Open"),new JMenuItem("Save"),new JMenuItem("Exit")};
    private JMenuItem [] editMenuItems={new JMenuItem("Find"),new JMenuItem("Undo"),new JMenuItem("Redo")};
    private JMenuItem [] helpMenuItems={new JMenuItem("Help-Info")};

    public App2() {
        Data data=new Data();
        checkPSCButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {

            }
        });
        loadDataButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                pressLoadDataButton();
            }
        });
        insertRowButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {

            }
        });
        deleteAllSpacesButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {

            }
        });

    }
    public void initFrame(){
        loadToJMenu(fileMenu,fileMenuItems);
        loadToJMenu(editMenu,editMenuItems);
        loadToJMenu(helpMenu,helpMenuItems);

        loadToMenuBar();

        frame = new JFrame("App2");
        frame.setLayout(new FlowLayout(FlowLayout.LEADING));
        //frame.add(panel2);
        frame.setJMenuBar(menuBar);
        frame.add(new App2().panelMain);

        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.pack();
        frame.setVisible(true);
    }


    private void loadToMenuBar(){
        menuBar=new JMenuBar();
        menuBar.add(fileMenu);
        menuBar.add(editMenu);
        menuBar.add(helpMenu);
    }

    private void loadToJMenu(JMenu menu,JMenuItem [] items){
        for (JMenuItem item : items) {
            menu.add(item);
            System.out.println(item);
        }
    }

    private void pressLoadDataButton(){
        loadData();
        tableview=new JTable(rowData,namesOfColumns);
        System.out.println(Arrays.toString(getNamesOfColumns()));
        System.out.println("load");
        panelMain.repaint();
        panelMain.revalidate();
    }
}

这是Data.class，但这很好。

package com.App;

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

public class Data {
    public Object[] namesOfColumns;
    public Object[][] rowData;
    public Object[] rowPSC;
    private String csvfile="data.csv";

    public Data() {
    }

    public void loadData(){
        loadNamesFromCSV();
        loadDataFromCSV();
    }

    public Object[] getNamesOfColumns() {
        return namesOfColumns;
    }

    public Object[] getRowPSC() {
        return rowPSC;
    }

    public void setRowPSC(Object[] rowPSC) {
        this.rowPSC = rowPSC;
    }

    public Object[][] getRowData() {

        return rowData;
    }

    public void setRowData(Object[][] rowData) {
        this.rowData = rowData;
    }

    public void setNamesOfColumns(Object[] namesOfColumns) {
        this.namesOfColumns = namesOfColumns;
    }

    private void loadNamesFromCSV(){
        BufferedReader br;
        String line;

        String splitby=";";

        try {
            br=new BufferedReader(new FileReader(csvfile));
            line=br.readLine();
            namesOfColumns= line.split(splitby);
        } catch (IOException e) {
            e.printStackTrace();
        }


    }

    private void loadDataFromCSV(){
        BufferedReader br;
        String line;
        String splitby=";";
        List<String[]> tmpList=new ArrayList<String[]>();
        try {
            br=new BufferedReader(new FileReader(csvfile));
            while((line=br.readLine())!=null){
                String []arrayline=line.split(splitby);
                tmpList.add(arrayline);
            }
        } catch (java.io.IOException e) {
            e.printStackTrace();
        }
        tmpList.remove(0);
        rowData=convertListToArray(tmpList);
    }

    private String[][] convertListToArray(List<String[]> list){
        String[][] array=new String[list.size()][(list.get(0)).length];
        for(int i=0;i<list.size();i++){
            String[] row=list.get(i);
            array[i]=row;
        }
        return array;
    }

//end of class
}

这是我的主要课程

package com.App;

public class Main {
    public static void main(String[] args) {
    App2 app2 =new App2();
    app2.initFrame();
    System.out.println("OK");
    }
}