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，

一樣，如果我想設置單元格（1,1）有Test Value值。

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，您需要與DefaultTableModel

指定表

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

---

您可以運行這個例子，看看

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(); 
      } 
     }); 
    } 
} 

---

編輯使用產品類。

「我創建了一個類產品有8個字段，我想用循環做的就是在填充ArrayList中的數據，以我的表什麼」

你想使用.addRow動態添加行。您需要從每個Product中獲取每個字段並將其設置爲一行。然後像這樣添加那一行。注意：您應該使用getters但爲了簡潔起見，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; 

    } 
}