Question

我在Java中遇到了一些关于排序价格的问题。

我希望ArrayList分别从高价到低价以及从低价到高价。

ArrayList<orderbook> buyerlist=new ArrayList<orderbook>();

我希望buyerlist按价格对对象序列进行排序。我在下面试过，但它不起作用。

buyerlist.add(new orderbook(orderrecord.get(i).getSide(),orderrecord.get(i).getVolume(),orderrecord.get(i).getPrice()));
Collections.sort(arraylist);

ArrayList<orderbook> sellerlist=new ArrayList<orderbook>();

我希望卖家列表可以按价格排序对象序列

这是我的构造函数

public class orderbook {


// here i defined three object of this constructor.
// i want sorting this sequence by price. from high to low and low to high respectively.


    String side;
    int volume;
    double price;

    public orderbook(String side,int volume,double price){
        this.side=side;
        this.volume=volume;
        // compare price is low then 0 will throw exception
        if (volume < 0) {
            throw new IllegalArgumentException("volume size illegal");
        }
        this.price=price;

        if (price < 0) {
            throw new IllegalArgumentException("price > 0 require");
        }
    }


    public String getSide() {
        return side;
    }
    public void setSide(String side) {
        this.side = side;
    }
    public int getVolume() {
        return volume;
    }
    public void setVolume(int volume) {
        this.volume = volume;
    }
    public double getPrice() {
        return price;
    }
    public void setPrice(double price) {
        this.price = price;
    }

}

Answer 1

如果您在某些Collection中拥有订单簿，例如ArrayList，那么您可以按顺序对它们进行排序：

Collections.sort(orderBooks, new Comparator<orderbook> {
    @Override
    public int compare(orderbook ob1, orderbook ob2) {
        return o1.getPrice() - o2.getPrice();
    }
});

关于Java对象排序

1 个答案: