/* 数学知识:斜率相同,截距相等即重合;斜率不等即相交;斜率相等,截距不等即平行 */ public class CrossLine { public boolean checkCrossLine(double s1, double s2, double y1, double y2) { // write code here if(s1 == s2 && y1 == y2) //直线重合 return true; else if(s1 != s2 ) //直线相交 r...