如何在JTable中設置特定單元格的值？

Question

我只是想知道如何update specific cell in JTable ，

就像我想將單元格（1,1）設置為具有Test Value 。

我的代碼是這樣的，但對我不起作用：

String s = "Test Value";
tableName.setValueAt((Object)s, 1, 1);

Answer 1

您可能希望使用DefaultTableModel#setValueAt()

DefaultTableModel model = (DefaultTableModel)tableName.getModel();

model.setValueAt(s, 1, 1);

首先需要使用DefaultTableModel指定表

 DefaultTableModel model = new DefaultTableModel(data, cols);
 JTable table = new JTable(model);

---

您可以運行此示例來查看

import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;
import javax.swing.table.DefaultTableModel;

public class TestTable {
    String[] cols = {"Col 1", "Col2"};
    String[][] data = {{"Hello", "World"},{"Hello", "World"}};
    DefaultTableModel model = new DefaultTableModel(data, cols);
    JTable table = new JTable(model);
    JButton button = new JButton("Set Value at 1, 1");
    JTextField text = new JTextField(20);

    public TestTable() {
        JPanel panel = new JPanel(new BorderLayout());
        panel.add(table, BorderLayout.NORTH);
        panel.add(text, BorderLayout.CENTER);
        panel.add(button, BorderLayout.SOUTH);

        button.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent e) {
                String value = text.getText();
                model.setValueAt(value, 1, 1);
            }
        });

        JFrame frame = new JFrame();
        frame.add(panel);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setLocationRelativeTo(null);
        frame.pack();
        frame.setVisible(true);

    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
               new TestTable();
            }
        });
    }
}

---

編輯使用Product類。

“我創建了一個包含8個字段的類產品，我想要做的是使用循環將ArrayList中的數據填充到我的表中”

您希望使用.addRow動態添加行。 您需要從每個Product獲取每個字段並將其排成一行。 然后像這樣添加該行。 注意：你應該使用getters但為了簡潔起見，我沒有。

for (Product p : list) {
    String data1 = p.field1;
    int data2 = p.field2;
    int data3 = p.field3;
    int data4 = p.field4;
    int data5 = p.field5;
    int data6 = p.field6;
    int data7 = p.field7;
    int data8 = p.field8;

    Object[] row = {data1, data2, data3, data4, data5, data6, data7, data8};
    model.addRow(row);

}

---

import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;
import java.util.List;
import javax.swing.*;
import javax.swing.table.DefaultTableModel;

public class TestTable {
    String[] cols = {"Col 1", "Col 2", "Col 3", "Col 4", "Col 5", "Col 6", "COl 7", "Col 8"};
    DefaultTableModel model = new DefaultTableModel(cols, 0);
    JTable table = new JTable(model);
    JButton button = new JButton("Set Table");
    List<Product> list;

    public TestTable() {
        JPanel panel = new JPanel(new BorderLayout());
        panel.add(new JScrollPane(table), BorderLayout.CENTER);
        panel.add(button, BorderLayout.SOUTH);

        list = getOneRow();

        button.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent e) {
                for (Product p : list) {
                    String data1 = p.field1;
                    int data2 = p.field2;
                    int data3 = p.field3;
                    int data4 = p.field4;
                    int data5 = p.field5;
                    int data6 = p.field6;
                    int data7 = p.field7;
                    int data8 = p.field8;

                    Object[] row = {data1, data2, data3, data4, data5, data6, data7, data8};
                    model.addRow(row);

                }
            }
        });

        JFrame frame = new JFrame();
        frame.add(panel);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.pack();
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    }

    public List<Product> getOneRow() {
        List<Product> list = new ArrayList<>();
        list.add(new Product("Product 1", 1, 2, 3, 4, 5, 6, 7));
        list.add(new Product("Product 2", 1, 2, 3, 4, 5, 6, 7));
        list.add(new Product("Product 3", 1, 2, 3, 4, 5, 6, 7));
        list.add(new Product("Product 4", 1, 2, 3, 4, 5, 6, 7));


        return list;
    }


    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
               new TestTable();
            }
        });
    }
}

class Product {
    String field1;
    int field2;
    int field3;
    int field4;
    int field5;
    int field6;
    int field7;
    int field8;

    public Product(String s, int f2, int f3, int f4, int f5, int f6, int f7, int f8) {
        field1 = s;
        field2 = f2;
        field3 = f3;
        field4 = f4;
        field5 = f5;
        field6 = f6;
        field7 = f7;
        field8 = f8;

    }  
}