相关疑难解决方法(0)

我的JTable有一个密码字段编辑器.我想在用户单击编辑另一个字段时,如果文本长度小于8位,则显示错误消息.我尝试过焦点听众.但它不起作用.请帮帮我,因为我刚刚开始使用java swing.

class PasswordEditor extends DefaultCellEditor 
{

    TextBox m_passWord = new TextBox(); 
    public PasswordEditor() {
        super(new TextBox());
    }

    @Override
    public Object getCellEditorValue() {

        return this.m_passWord.getText();
    }

    @Override
    public Component getTableCellEditorComponent(JTable table,
            Object value, boolean isSelected, int row, int column) {

        Object fieldValue = value;
        if(null == fieldValue)
            fieldValue = Constants.EMPTY_STRING;

        this.m_passWord.addInputMethodListener(new InputMethodListener() {

            @Override
            public void inputMethodTextChanged(InputMethodEvent event)
            {
                // TODO Auto-generated method stub

            }

            @Override
            public void caretPositionChanged(InputMethodEvent event)
            {
                // TODO Auto-generated method stub

            }
        })
        this.m_passWord.addFocusListener(new FocusListener() …