java JList 添加数据后,如何更新啊

更新的话，可以使用自身的validate方法；

也可以使用SwingUtiltis.updateComponentUI等方法解决。

示例代码如下：

import java.awt.*

import java.awt.event.*

 

import javax.swing.*

 

public class LookAndFeelDemo2 extends JFrame {

 

    private JRadioButton radio1 = new JRadioButton("Metal")

    private JRadioButton radio2 = new JRadioButton("Windows")

    private JRadioButton radio3 = new JRadioButton("Motif")

    private JPanel panelNorth = new JPanel()

    private JPanel panelSouth = new JPanel()

    private JTextArea area = new JTextArea(6, 20)

    private JButton btn = new JButton("button")

    private JCheckBox chk = new JCheckBox("checkBox")

    private JComboBox cmbLookAndFeel = new JComboBox(new String[] { "Metal",

            "Widows", "Motif", "GTK" })

 

    public LookAndFeelDemo2(String title) {

        super(title)

        Container contentPane = this.getContentPane()

        ButtonGroup group = new ButtonGroup()

        group.add(radio1)

        group.add(radio2)

        group.add(radio3)

 

        panelNorth.add(radio1)

        panelNorth.add(radio2)

        panelNorth.add(radio3)

 

        panelSouth.add(btn)

        panelSouth.add(chk)

        panelSouth.add(cmbLookAndFeel)

 

        contentPane.add(panelNorth, BorderLayout.NORTH)

        contentPane.add(area, BorderLayout.CENTER)

        contentPane.add(panelSouth, BorderLayout.SOUTH)

        pack()

 

        setVisible(true)

        setSize(300, 400)

        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE)

 

        // 监听Item事件

        radio1.addItemListener(new MyItemListener())

        radio2.addItemListener(new MyItemListener())

        radio3.addItemListener(new MyItemListener())

 

    }

 

    private class MyItemListener implements ItemListener {

 

        public void itemStateChanged(ItemEvent e) {

            // 取得点击按钮的名字

            String itemName = ((JRadioButton) e.getSource()).getText()

            changeLookAndFeel(itemName)

        }

    }

 

    // 设置外观的private类型方法

 

    private void changeLookAndFeel(String name) {

 

        String lookAndFeel = ""

        if (name.equals("Metal")) {

            lookAndFeel = "javax.swing.plaf.metal.MetalLookAndFeel"

 

        } else if (name.equals("Windows")) {

            lookAndFeel = "com.sun.java.swing.plaf.windows.WindowsLookAndFeel"

        } else if (name.equals("Motif")) {

            lookAndFeel = "com.sun.java.swing.plaf.motif.MotifLookAndFeel"

        }else{

            //取得默认的metal外观

            lookAndFeel = "javax.swing.plaf.metal.MetalLookAndFeel"

        }

 

        try {

            UIManager.setLookAndFeel(lookAndFeel)

            // 运行时指定LookAndFeel，需要SwingUtilities.updateComponentTreeUI（Component

            // c)实现动态的更新

            SwingUtilities.updateComponentTreeUI(this)

            area.setText("当前外观类名：\n" + lookAndFeel)

        } catch (Exception ex) {

            ex.printStackTrace()

        }

 

    }

 

    public static void main(String[] args) {

        new LookAndFeelDemo2("LookAndFeel")

    }

}

看 http://docs.oracle.com/javase/1.5.0/docs/api/javax/swing/table/DefaultTableModel.html String[] columnNames = new String[] {"A","B","C"}JTable table = new JTable(columnNames, 0)DefaultTableModel model = (DefaultTableModel) table.getModel()Random seed = new Random()SimpleDateFormat format = new SimpleDateFormat("HH:mm:ss")for(int i = 0i <1000i++) {table.addRow(new String[]{format.format(new Date()),String.valueOf(seed.nextInt()),String.valueOf(seed.nextInt())})table.fireTableDataChanged() Thread.sleep(1000)}

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