Exercise02_09

 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 );
     }
 }