请问这段代码是什么意思

public void setNextCardLocation(Point point){
PKCard card = main.getNextCard(this);
if (card != null){
if (point == null){
card.setNextCardLocation(null);
main.table.remove(card.getLocation());
card.setLocation(card.initPoint);
main.table.put(card.initPoint, card);
}
else{
point = new Point(point);
point.y += 20;
card.setNextCardLocation(point);
point.y -= 20;
main.table.remove(card.getLocation());
card.setLocation(point);
main.table.put(card.getLocation(), card);
card.initPoint = card.getLocation();
}
}
}

你好，望采纳！
处理card位置的逻辑

public void setNextCardLocation(Point point){
PKCard card = main.getNextCard(this);//获取下一个pkcard
if (card != null){//如果card存在
if (point == null){//如果point不存在，设置默认值
card.setNextCardLocation(null);
main.table.remove(card.getLocation());
card.setLocation(card.initPoint);
main.table.put(card.initPoint, card);
}
else{//如果存在，x和y坐标各加20
point = new Point(point);
point.y += 20;
card.setNextCardLocation(point);
point.y -= 20;
main.table.remove(card.getLocation());
card.setLocation(point);
main.table.put(card.getLocation(), card);
card.initPoint = card.getLocation();
}
}
}