JTable不會在JPanel上顯示

您好我已經創建了一個Jtable，並可以讓它顯示在我的框架上，但不是JPanel上，我有我的JFrame ontop。我似乎無法改變JTable不會在JPanel上顯示

import java.awt.; 
import java.awt.event.ActionEvent; 
import java.awt.event.ActionListener; 
import java.io.; 
import java.util.ArrayList; 
import java.util.Comparator; 
import javax.swing.; 
import javax.swing.table.; 

public class Main 
{ 
    DefaultTableModel table_model; 
    String[][] addressData = new String[10][5]; 
    JPanel panel; 
    JFrame frame; 
    JButton loadData; 
    int count,index,row =0; 
    String thisLine; 
    ArrayList People = new ArrayList(); 

public Main() 
{ 
    //Creating JFrame and setting properties 
    frame = new JFrame(); 
    frame.setResizable(false); 
    frame.setTitle("Address Book"); 
    frame.setSize(800,600); 
    frame.setDefaultCloseOperation(frame.EXIT_ON_CLOSE); 

    //Creating JPanel and setting properties 
    panel = new JPanel(); 
    panel.setLayout(null); 
    panel.setBackground(new Color(77,81,84)); 

    //Setting the table and Scroll Bars 
    this.table_model = new DefaultTableModel(addressData, new String[]{"First Name", "Surname", "Home Number", "Mobile Number", "Address", "Postcode"}); 
    JTable table = new JTable(this.table_model); 
    table.setBounds(130, 40, 200, 200); 
    panel.add(new JScrollPane(table, JScrollPane.VERTICAL_SCROLLBAR_ALWAYS, JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS)); 

    //Load Data button, reading file in and adding data to ArrayList then Array of Arrays 
    loadData = new JButton("Load File"); 
    loadData.setBounds(10, 10, 100, 20); 
    loadData.addActionListener(new ActionListener() 
    { 
     public void actionPerformed(ActionEvent e) 
     { 
      try 
      { 
       BufferedReader reader = new BufferedReader(new FileReader("file/address.buab")); 
       while ((thisLine = reader.readLine()) !=null) 
       { 
        if (row >= 4) 
        { 
         index++; 
         row = 0; 
         People.add(thisLine); 
         addressData[index][row] = People.get(count); 
         count++; 
         row++; 
        } 
        else 
        { 
        People.add(thisLine); 
        addressData[index][row] = People.get(count); 
        count++; 
        row++; 
        } 
       } 
       reader.close(); 
      } 
      catch (IOException ex) 
      { 
       System.err.println("Input Exception, Check address.buab File"); 
      } 
     } 
    }); 
    panel.add(loadData); 

    //Auto sort on table fields 
    TableRowSorter<TableModel> sorter = new TableRowSorter<TableModel>(this.table_model); 
    sorter.setComparator(1, new Comparator<Integer>() 
    { 
     public int compare(Integer o1, Integer o2) 
     { 
      return o1.compareTo(o2); 
     } 

     public boolean equals(Object obj) 
     { 
      return obj.equals(this); 
     } 
    }); 

    table.setRowSorter(sorter); 

    frame.getContentPane().add(panel); 
    frame.setVisible(true); 
} 

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

}

，我怎麼可能去設置表ontop的我JPanel的可見的任何想法

來源

2009-11-23 Student01

胡亂猜測：

panel.setLayout(null);

試試這個：

panel.setLayout(new BorderLayout());

及更高版本：

panel.add(loadData, BorderLayout.SOUTH) // e.g. for the button 

// e.g. for the table 
panel.add(new JScrollPane(table, .....)), BorderLayout.CENTER)

來源

2009-11-23 23:30:28 miku

您需要創建適當的約束你的JPanel與特定的佈局管理器，然後添加組件（JTable和JButton），以使它們出現在面板中的正確位置。目前，您正在將面板的佈局管理器設置爲null，這幾乎肯定是不正確的。你可能想看看Using Layout Managers教程。

要考慮的一個簡單的佈局管理器是BorderLayout。例如：

// Create JPanel with BorderLayout layout manager. 
JPanel panel = new JPanel(new BorderLayout()); 

// Add JTable to panel center. This component will expand 
// to take up available space. 
panel.add(myTableScrollPane, BorderLayout.CENTER); 

// Add button to the bottom of the panel. 
panel.add(myButton, BorderLayout.SOUTH);

來源

2009-11-23 23:31:24 Adamski

JTable不會在JPanel上顯示

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