創建動態表添加新項與按鈕

Question

我想建立一個註冊，以便當一個按鈕被點擊時，一個新的條目出現在一張桌子上。理想情況下，我正在尋找在屏幕左側創建一個表格，單擊按鈕時會出現兩行和一列新列。我希望表格具有固定的大小，但在一定數量的條目後它應該可以滾動。到目前爲止，我已經創建並格式化了我想要單擊的JButton對象以顯示新條目。我也知道我應該使用JTable來追求這一點。

我該如何去做這個動態表？

到目前爲止的代碼：

private void addRegister(JPanel pane) { 

      JPanel everythingPane = new JPanel(); 
      JPanel pluPane = new JPanel(); 

      Dimension button = new Dimension(200,150); 

      JTable pluTable = new JTable(); 


      JPanel buttonPane = new JPanel(); 

      buttonPane.setLayout(new BoxLayout(buttonPane, BoxLayout.Y_AXIS)); 

      //JPanel buttonPane = new JPanel (new FlowLayout (FlowLayout.LEFT)); 

      JPanel subPane1 = new JPanel(); 
      subPane1.setAlignmentX(LEFT_ALIGNMENT); 
      JPanel subPane2 = new JPanel(); 
      subPane2.setAlignmentX(LEFT_ALIGNMENT); 
      JPanel subPane3 = new JPanel(); 
      subPane3.setAlignmentX(LEFT_ALIGNMENT); 
      JPanel subPane4 = new JPanel(); 
      subPane4.setAlignmentX(LEFT_ALIGNMENT); 
      JPanel subPane5 = new JPanel(); 
      subPane5.setAlignmentX(LEFT_ALIGNMENT); 
      JPanel alignmentLayer = new JPanel(); 

      JButton frappuccino = new JButton("Frappuccino"); 
      JButton icedCoffee = new JButton("Iced Coffee"); 
      frappuccino.setPreferredSize(button); 
      icedCoffee.setPreferredSize(button); 

      JButton arizona = new JButton("Arizona Green Tea"); 
      JButton izze = new JButton("Izze"); 
      arizona.setPreferredSize(button); 
      izze.setPreferredSize(button); 

      JButton snapple = new JButton("Snapple"); 
      JButton gatorade = new JButton("Gatorade"); 
      snapple.setPreferredSize(button); 
      gatorade.setPreferredSize(button); 

      JButton water = new JButton("Water"); 
      JButton appleJuice = new JButton("Apple Juice"); 
      water.setPreferredSize(button); 
      appleJuice.setPreferredSize(button); 

      JButton orangeJuice = new JButton("Orange Juice"); 
      JButton mentos = new JButton("Mentos"); 
      orangeJuice.setPreferredSize(button); 
      mentos.setPreferredSize(button); 

      JButton gum = new JButton("Gum"); 
      JButton cliffBar = new JButton("Cliff Bar"); 
      gum.setPreferredSize(button); 
      cliffBar.setPreferredSize(button); 

      JButton littleBites = new JButton("Little Bites"); 
      JButton welchs = new JButton("Welch's Fruit Snacks"); 
      littleBites.setPreferredSize(button); 
      welchs.setPreferredSize(button); 

      JButton fiberOneBar = new JButton("Fiber One Bar"); 
      JButton fiberOneBrownie = new JButton("Fiber One Brownie"); 
      fiberOneBar.setPreferredSize(button); 
      fiberOneBrownie.setPreferredSize(button); 

      JButton cheezeIts = new JButton("Cheeze Its"); 
      JButton goldFish = new JButton("Gold Fish"); 
      cheezeIts.setPreferredSize(button); 
      goldFish.setPreferredSize(button); 

      JButton teaBag = new JButton("Tea Bag"); 
      JButton poptarts = new JButton("Poptarts"); 
      teaBag.setPreferredSize(button); 
      poptarts.setPreferredSize(button); 

      JButton sampleButton = new JButton("Sample Button"); 
      JButton sampleButton2 = new JButton("Sample Button"); 
      sampleButton.setPreferredSize(button); 
      sampleButton2.setPreferredSize(button); 

      JButton sampleButton3 = new JButton("Sample Button"); 
      JButton sampleButton4 = new JButton("Sample Button"); 
      sampleButton3.setPreferredSize(button); 
      sampleButton4.setPreferredSize(button); 


      subPane1.add(frappuccino); 
      subPane1.add(icedCoffee); 

      subPane1.add(arizona); 
      subPane1.add(izze); 

      subPane2.add(snapple); 
      subPane2.add(gatorade); 

      subPane2.add(water); 
      subPane2.add(appleJuice); 

      subPane3.add(orangeJuice); 
      subPane3.add(mentos); 

      subPane3.add(gum); 
      subPane3.add(cliffBar); 

      subPane4.add(littleBites); 
      subPane4.add(welchs); 

      subPane4.add(fiberOneBar); 
      subPane4.add(fiberOneBrownie); 

      subPane5.add(cheezeIts); 
      subPane5.add(goldFish); 

      subPane5.add(teaBag); 
      subPane5.add(poptarts);    

      alignmentLayer.add(sampleButton); 
      alignmentLayer.add(sampleButton2); 
      alignmentLayer.add(sampleButton3); 
      alignmentLayer.add(sampleButton4); 


      buttonPane.add(subPane1); 
      buttonPane.add(subPane2); 
      buttonPane.add(subPane3); 
      buttonPane.add(subPane4); 
      buttonPane.add(subPane5); 
      buttonPane.add(Box.createRigidArea(new Dimension(5,100))); 
      buttonPane.add(alignmentLayer); 


      pluPane.add(pluTable); 

      everythingPane.add(pluPane); 
      everythingPane.add(buttonPane); 

      pane.add(everythingPane); 

     } 

Answer 1

JTable中，增加了行，而不是列一種方式更常用。我重新考慮了這個example來說明下面的基本想法。每次單擊該按鈕時，都會在表格的模型中添加一個新行，以更新表格本身。

import java.awt.BorderLayout; 
import java.awt.Dimension; 
import java.awt.EventQueue; 
import java.awt.Rectangle; 
import java.awt.event.ActionEvent; 
import java.awt.event.AdjustmentEvent; 
import java.awt.event.AdjustmentListener; 
import javax.swing.AbstractAction; 
import javax.swing.JButton; 
import javax.swing.JFrame; 
import javax.swing.JPanel; 
import javax.swing.JScrollBar; 
import javax.swing.JScrollPane; 
import javax.swing.JTable; 
import javax.swing.table.DefaultTableModel; 

/** 
* @see https://stackoverflow.com/a/19472190/230513 
* @see https://stackoverflow.com/a/7519403/230513 
*/ 
public class TableAddTest extends JPanel { 

    private static final int N_ROWS = 8; 
    private static String[] header = {"ID", "String", "Number", "Boolean"}; 
    private DefaultTableModel dtm = new DefaultTableModel(null, header) { 

     @Override 
     public Class<?> getColumnClass(int col) { 
      return getValueAt(0, col).getClass(); 
     } 
    }; 
    private JTable table = new JTable(dtm); 
    private JScrollPane scrollPane = new JScrollPane(table); 
    private JScrollBar vScroll = scrollPane.getVerticalScrollBar(); 
    private int row; 
    private boolean isAutoScroll; 

    public TableAddTest() { 
     this.setLayout(new BorderLayout()); 
     Dimension d = new Dimension(320, N_ROWS * table.getRowHeight()); 
     table.setPreferredScrollableViewportSize(d); 
     for (int i = 0; i < N_ROWS; i++) { 
      addRow(); 
     } 
     scrollPane.setVerticalScrollBarPolicy(
      JScrollPane.VERTICAL_SCROLLBAR_ALWAYS); 
     vScroll.addAdjustmentListener(new AdjustmentListener() { 

      @Override 
      public void adjustmentValueChanged(AdjustmentEvent e) { 
       isAutoScroll = !e.getValueIsAdjusting(); 
      } 
     }); 
     this.add(scrollPane, BorderLayout.CENTER); 
     JPanel panel = new JPanel(); 
     panel.add(new JButton(new AbstractAction("Add Row") { 

      @Override 
      public void actionPerformed(ActionEvent e) { 
       addRow(); 
      } 
     })); 
     this.add(panel, BorderLayout.SOUTH); 
    } 

    private void addRow() { 
     char c = (char) ('A' + row++ % 26); 
     dtm.addRow(new Object[]{ 
       Character.valueOf(c), 
       String.valueOf(c) + String.valueOf(row), 
       Integer.valueOf(row), 
       Boolean.valueOf(row % 2 == 0) 
      }); 
    } 

    public static void main(String[] args) { 
     EventQueue.invokeLater(new Runnable() { 

      @Override 
      public void run() { 
       JFrame f = new JFrame(); 
       f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
       TableAddTest nlt = new TableAddTest(); 
       f.add(nlt); 
       f.pack(); 
       f.setLocationRelativeTo(null); 
       f.setVisible(true); 
      } 
     }); 
    } 
}