Java Program to find the 180 degree reflection of one point around another point .
class GFG { static void findPoint ( int x1 , int y1 , int x2 , int y2 ) { System . out . println ( " ( " + ( int ) ( 2 * x2 - x1 ) + " , " + ( int ) ( 2 * y2 - y1 ) + " ▁ ) " ) ; }