JTable新列添加不成功

Question

下面是我试图解析的部分代码。我在这里尝试实现的是“在末尾再添加一个空白列，然后逐行填充该列的单元格值”。

尽管我可以调试，但在行 table.setValueAt(finalCell, row, table.getColumnCount()-1);

它正在尝试更新单元格 (1,5) 但在该行之后我的行变为 [你好，, , , 1] 来自 [Lee, Hsien杨, , , , 1]。

我期待的是[李显扬,1,你好]

但这里更新的是第一列而不是新的第 5 列。

我怎样才能实现我的目标？

            CSVReader reader = new CSVReader(new FileReader(file)); 

            List<String[]> myEntries = reader.readAll();
            String[][] rowData = myEntries.toArray(new String[0][]);

            String[] columnNames = { "People", "Place", "Organisation", "Event", "Mentions" };

            JTable table=new JTable(rowData, columnNames);

            TableColumn newColumn=new TableColumn();
            table.getColumnModel().addColumn(newColumn);

            Boolean isFirstLine=true;

            for(int row=0;row< table.getRowCount();row++)
            {
                if(isFirstLine)
                {
                    isFirstLine=false;
                    continue;
                }
                String finalCell="";

                for(int col=0;col<table.getColumnCount()-1;col++)
                {
                    finalCell="Hello";
                }
                table.setValueAt(finalCell, row, table.getColumnCount()-1);
            }

Answer 1

使用适当的TableModel

            CSVReader reader = new CSVReader(new FileReader(file));

            List<String[]> myEntries = reader.readAll();
            String[][] rowData = myEntries.toArray(new String[0][]);

            String[] columnNames = {"People", "Place", "Organisation", "Event", "Mentions"};

            DefaultTableModel tableModel = new DefaultTableModel(rowData, columnNames);

            tableModel.addColumn(""); // What ever name you want to give it...

            Boolean isFirstLine = true;

            for (int row = 0; row < tableModel.getRowCount(); row++) {
                if (isFirstLine) {
                    isFirstLine = false;
                    continue;
                }
                String finalCell = "";

                for (int col = 0; col < tableModel.getColumnCount() - 1; col++) {
                    finalCell = "Hello";
                }
                tableModel.setValueAt(finalCell, row, tableModel.getColumnCount() - 1);
            }

            JTable table = new JTable(tableModel);

TableModel 通常负责管理数据，通常是设置这些东西的地方。

有关详细信息，请参阅 How to Use Tables

Thanks but New column name is coming null

适合我...

import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.table.DefaultTableModel;

public class Test {

    public static void main(String[] args) {
        new Test();
    }

    public Test() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
                    ex.printStackTrace();
                }

                String[] columnNames = {"People", "Place", "Organisation", "Event", "Mentions"};

                String[][] rowData = new String[][]{
                    {"Lee", "Hsien Yang", "", "", ""}
                };

                DefaultTableModel tableModel = new DefaultTableModel(rowData, columnNames);

                tableModel.addColumn(""); // What ever name you want to give it...

                Boolean isFirstLine = true;

                for (int row = 0; row < tableModel.getRowCount(); row++) {
                    tableModel.setValueAt("Hello", row, tableModel.getColumnCount() - 1);
                }

                JTable table = new JTable(tableModel);

                JFrame frame = new JFrame("Testing");
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.add(new JScrollPane(table));
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }
        });
    }

}

奇怪的是，你是示例代码；

[Lee, Hsien Yang, , , , 1]

有 6 列，但您只允许 5...

String[] columnNames = {"People", "Place", "Organisation", "Event", "Mentions"};

这将在您调用 addColumn

时覆盖该列的数据

JTable新列添加不成功

JTable new column Add not successful

java

csv

swing

jtable