java 弹出窗口编程

//default title and icon            JOptionPane.showMessageDialog(frame,            "Eggs are not supposed to be green.",            "Message");            //custom title, warning icon            JOptionPane.showMessageDialog(frame,            "Eggs are not supposed to be green.",            "Inane warning",            JOptionPane.WARNING_MESSAGE);            //custom title, error icon            JOptionPane.showMessageDialog(frame,            "Eggs are not supposed to be green.",            "Inane error",            JOptionPane.ERROR_MESSAGE);            //custom title, no icon            JOptionPane.showMessageDialog(frame,            "Eggs are not supposed to be green.",            "A plain message",            JOptionPane.PLAIN_MESSAGE);            //custom title, custom icon            JOptionPane.showMessageDialog(frame,            "Eggs are not supposed to be green.",            "Inane custom dialog",            JOptionPane.INFORMATION_MESSAGE,            icon);