Java for loop cuboid

int start_x = 100;
int end_x = 120;
if(start_x > end_x){
  int buffer_x = start_x;
  start_x = end_x;
  end_x = buffer_x;
}

int start_y = 30;
int end_y = 90;
if(start_y > end_y){
  int buffer_y = start_y;
  start_y = end_y;
  end_y = buffer_y;
}

for(int x = start_x; x <= end_x; x++){
    for(int y = start_y; y <= end_y; y++){
        sender.sendMessage("Current coordinate: X=" + x + " Y=" + y);
    }
}