Exercise02_15

import javax.swing.JOptionPane;
public class Distance {
    public static void main(String[] args){
        String number;
        double x1,x2,y1,y2,distance;
        number=JOptionPane.showInputDialog(null,"输入x1"); 
        x1=Double.parseDouble(number);
        number=JOptionPane.showInputDialog(null,"输入x2"); 
        x2=Double.parseDouble(number);
        number=JOptionPane.showInputDialog(null,"输入y1"); 
        y1=Double.parseDouble(number);
        number=JOptionPane.showInputDialog(null,"输入y2"); 
        y2=Double.parseDouble(number);
        distance=Math.pow((x2-x1)*(x2-x1)+(y2-y1)*(y2-y1), 0.5);
        int messageType=JOptionPane.INFORMATION_MESSAGE;
        String message="The distance between the two points is " + distance;
        JOptionPane.showMessageDialog(null,message,"result",messageType);
        
    }
}