import javax.swing.JOptionPane;public class Distance {    public static void main(String[] args){        String input = JOptionPane.showInputDialog(null,"请输入x1的坐标：","对话框",JOptionPane.QUESTION_MESSAGE);        String input1 = JOptionPane.showInputDialog(null,"请输入y1的坐标：","对话框",JOptionPane.QUESTION_MESSAGE);        String input2 = JOptionPane.showInputDialog(null,"请输入x2的坐标：","对话框",JOptionPane.QUESTION_MESSAGE);        String input3 = JOptionPane.showInputDialog(null,"请输入y2的坐标：","对话框",JOptionPane.QUESTION_MESSAGE);        double x1 = Double.parseDouble(input);        double y1 = Double.parseDouble(input1);        double x2 = Double.parseDouble(input2);        double y2 = Double.parseDouble(input3);        System.out.println("x1 and y1:" + x1 + y1);        System.out.println("x2 and y2:" + x2 + y2);        System.out.println("The distance of the two points is " + Math.pow((Math.pow(x2 - x1, 2) + Math.pow(y2 - y1, 2)), 0.5));    }}