import javax.swing.JOptionPane;

 public class Acceleration {

     public static void main(String[] args){

         double v0,v1,t,a;

         String number;

         number=JOptionPane.showInputDialog(null,"输入初速度");

         v0=Double.parseDouble(number);

         number=JOptionPane.showInputDialog(null,"输入末速度");

         v1=Double.parseDouble(number);

         number=JOptionPane.showInputDialog(null,"输入时间");

         t=Double.parseDouble(number);

         a=(v1-v0)/t;

         int messageType=JOptionPane.INFORMATION_MESSAGE;

         String message="The average acceleration is " + a;

         JOptionPane.showMessageDialog(null,message,"result",messageType );

     }

 }