ListCheckBox如何设置选中啊。着急！分不够再加~

如题。

解决方案 »

  1.   

    import javax.swing.JList;import java.awt.*;import java.awt.event.*;import javax.swing.*;import javax.swing.event.*; public class CheckListBox extends JList {    //这个boolean数组装载所有item是否被check的信息。    private static final long serialVersionUID = 185589712699329969L;
    private boolean[] checkedItems = null;     /**     * 定义一个简单的ListModel,它可以发送check变化事件。     */    class CheckListBoxModel extends AbstractListModel {        private Object[] items = null;         CheckListBoxModel(Object[] items) {            this.items = items;        }         public int getSize() {            return items.length;        }         public Object getElementAt(int i) {            return items[i];        }         protected void fireCheckChanged(Object source, int index) {            fireContentsChanged(source, index, index);        }         public Object getItem(int index) {            return items[index];        }    }     /**     * 这里就覆盖了一个构造函数。其他JList你自己覆盖吧，反正super一下再init就OK了。     * @param items Object[]     */    public CheckListBox(Object[] items) {        setModel(new CheckListBoxModel(items));        init();    }     /**     * 初始化控件。包括初始化boolean数组、安装一个渲染器、安装一个鼠标监听器。     */    protected void init() {        checkedItems = new boolean[this.getModel().getSize()];        class MyCellRenderer extends JCheckBox implements ListCellRenderer {            public MyCellRenderer() {                setOpaque(true);            }             public Component getListCellRendererComponent(                JList list,                Object value,                int index,                boolean isSelected,                boolean cellHasFocus) {                //这点代码基本上从DefaultListCellRenderer.java中抄袭的。                setComponentOrientation(list.getComponentOrientation());                if (isSelected) {                    setBackground(list.getSelectionBackground());                    setForeground(list.getSelectionForeground());                } else {                    setBackground(list.getBackground());                    setForeground(list.getForeground());                }                 if (value instanceof Icon) {                    setIcon( (Icon) value);                    setText("");                } else {                    setIcon(null);                    setText( (value == null) ? "" : value.toString());                }                setEnabled(list.isEnabled());                setFont(list.getFont());                 //虽然抄袭，可这里别忘了设置check信息。                this.setSelected(isChecked(index));                return this;            }        }         this.setCellRenderer(new MyCellRenderer());        //定义一个鼠标监听器。如果点击某个item，翻转其check状态。        class CheckBoxListener extends MouseAdapter {            public void mouseClicked(MouseEvent e) {                int index = locationToIndex(e.getPoint());                invertChecked(index);            }        }         this.addMouseListener(new CheckBoxListener());    }     /**     * 翻转指定item的check状态。     * @param index int     */    public void invertChecked(int index) {        checkedItems[index] = !checkedItems[index];        //别忘了发送event。        CheckListBoxModel model = (CheckListBoxModel) getModel();        model.fireCheckChanged(this, index);        this.repaint();    }     /**     * 是否指定item被check。     * @param index int     * @return boolean     */    public boolean isChecked(int index) {        return checkedItems[index];    }     /**     * 获得选中的item个数     */    public int getCheckedCount() {        int result = 0;        for (int i = 0; i < checkedItems.length; i++) {            if (checkedItems[i]) {                result++;            }        }        return result;    }     /**     * 所有选中item索引的数组。     */    public int[] getCheckedIndices() {        int[] result = new int[getCheckedCount()];        int index = 0;        for (int i = 0; i < checkedItems.length; i++) {            if (checkedItems[i]) {                result[index] = i;                index++;            }        }        return result;    }     public static void main(String[] args) {        JFrame frame = new JFrame("JCheckListBox - [email protected]");         final CheckListBox list = new CheckListBox(new Object[] {"张三", "李四", "王二麻子", "木头六"});        frame.getContentPane().add(new JScrollPane(list), BorderLayout.CENTER);        JButton button = new JButton("OK");        button.addActionListener(new ActionListener() {            public void actionPerformed(ActionEvent e) {                System.exit(0);            }        });        frame.getContentPane().add(button, BorderLayout.SOUTH);        final JLabel label = new JLabel("当前没有选择。");        list.getModel().addListDataListener(new ListDataListener() {            public void intervalAdded(ListDataEvent e) {}             public void intervalRemoved(ListDataEvent e) {}             public void contentsChanged(ListDataEvent e) {                if (list.getCheckedCount() == 0) {                    label.setText("当前没有选择。");                } else {                    String text = "当前选择:";                    int[] indices = list.getCheckedIndices();                    for (int i = 0; i < indices.length; i++) {                        text += ( (CheckListBoxModel) list.getModel()).getItem(indices[i]).toString() + ",";                    }                    label.setText(text);                }            }        });        frame.getContentPane().add(label, BorderLayout.NORTH);        frame.setBounds(300, 300, 400, 200);        frame.show();    }}
      

  2.   

    我把代码发出来了。大家看下。现在checkBox选上了。我如何设置checkBox不选~~