爲什麼我的JTable沒有顯示出來？

Question

我的JTable沒有顯示出來。我不知道爲什麼。也許你可以幫助我。我有一個窗口類，它有一個右側面板，右側面板應該顯示一個包含模型數據的表格。我已經使用虛擬數據開始，如月和日。

這裏是右側面板類

import model.*; 


import java.awt.*; 
import java.awt.event.*; 
//import java.text.*; 
import javax.swing.*; 


public class RightPanel extends JPanel implements View 
{ 
    private TablePanel songsnartists = new TablePanel(); 
    Shop shop; 

    public RightPanel(Shop ourShop) 
    { 
     shop = ourShop; 
     setup(); 
     build(); 
     setVisible(true); 
    } 

    private void setup() 
    { 
     setPreferredSize(new Dimension(300, 300)); 
     setLayout(new GridLayout(3,2)); 
     setBorder(BorderFactory.createLineBorder(Color.blue)); 
    } 

    private void build() 
    { 
     add(songsnartists); 
    } 

    public void update() 
    {} 
} 

/*很簡單，到目前爲止只是想表面板添加到我的右側面板*/

這裏是我創建的TablePanel類。它繼承JTable並使用繼承AbstractTableModel的私有類MyTableModel，以便創建一個不可編輯的表。

import javax.swing.*; 
import javax.swing.table.*; 


public class TablePanel extends JTable 
{ 
    //private int ROWS = 3; 
    //private int COLUMNS = 2; 
    private final String [][] data = {{"Jan", "31"}, {"Feb","28"},{"Mar","31"}}; 
    private final String[] headers = {"Month", "Days"}; 
    JTable table; 


    public TablePanel() 
    { 
     table = new JTable(new MyTableModel(data, headers)); 
     JTableHeader header = table.getTableHeader(); 
     //header.setBackground(Color.blue); 
     setVisible(true); 
    } 

    private class MyTableModel extends AbstractTableModel 
    { 
     private String[] columnNames = {"Month", "Days"}; 
     private String[][] data = {{"Jan", "31"}, {"Feb","28"},{"Mar","31"}}; 

     public MyTableModel(String [][] data, String [] header) 
     { 
      int rows, cols, rowCounter, colCounter; 

      rows = getRowCount(); 
      cols = getColumnCount(); 

      for (rowCounter=0; rowCounter < rows; rowCounter++) 
       { 
        for (colCounter=0; colCounter < cols; colCounter++) 
         { 
          setValueAt(data[rowCounter][colCounter],rowCounter,colCounter); 
         } 
       }   
     } 


     public int getColumnCount() 
     { 
      return columnNames.length; 
     } 

     public int getRowCount() 
     { 
      return data.length; 
     } 

     public String getColumnName(int col) 
     { 
      return columnNames[col]; 
     } 

     public Object getValueAt(int row, int col) 
     { 
      return data[row][col]; 
     } 

     public Class getColumnClass(int c) 
     { 
      return getValueAt(0, c).getClass(); 
     } 

     public boolean isCellEditable(int row, int col) 
     { 
      return false; 
     } 
    } 
} 

正如您所見，抽象方法在私有類中被覆蓋。任何人都可以幫我指出爲什麼我的JTable沒有顯示出來嗎？

Answer 1

• 讀教程How to Use Tables

• 把JTable到JScrollPane

• 不要忘記使用合適的LayoutManager把JScrollPane到JPanel，我看不出有您添加JTable到JPanel，不確定新的GridLayout(3,2)可能是合適的LayoutManager對於JTable view