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 );
    }
}