java程序设计题,求大神解答,谢谢!答:package Test0;import java.util.Scanner;public class Point {public static void main(String[] args) {new Point();}public Point() {double x1=1,x2=2,y1=4,y2=9;double xa=4,xb=2,ya=6,yb=4;double length1,length2,max;length1 = Math.sqrt((x2-x1)*(x2-x1)+(y2-y1)*...