Java 输入框复用代码

1         int messageType=JOptionPane.INFORMATION_MESSAGE;
         String message=mines + " minutes is approximately " + years + " years and " + days + " days";
         JOptionPane.showMessageDialog(null,message,"result",messageType );

                String number;
        number=JOptionPane.showInputDialog(null,"输入初速度");
        v0=Double.parseDouble(number);