如何扩展 OHLCItem class 并在 OHLCSeries 中使用它

Question

我想扩展 OHLCItem class from the JFreeChart library and I would like to use those custom objects to build an OHLCSeries with them. This works ok. However, when I am trying to retrieve those objects from the OHLCSeries using the getDataItem(int index) method, I only receive ComparableObjectItem 对象的行为，这些对象只能转换为 OHLCItem，但不能转换为我的自定义 class。这是我定义自定义 class:

的方式

public class CustomOHLCItem extends OHLCItem {
private boolean isJoinedCandle;
private OHLCItem clickedItem;
private OHLCItem neighbourItem;
public CustomOHLCItem(RegularTimePeriod period, double open, double high, double low, double close, boolean isJoinedCandle) {
    super(period, open, high, low, close);
    this.isJoinedCandle = isJoinedCandle;
}

public boolean isJoinedCandle() {
    return isJoinedCandle;
}

public OHLCItem getClickedItem() {
    return clickedItem;
}

public void setClickedItem(OHLCItem clickedItem) {
    this.clickedItem = clickedItem;
}

public OHLCItem getNeighbourItem() {
    return neighbourItem;
}

public void setNeighbourItem(OHLCItem neighbourItem) {
    this.neighbourItem = neighbourItem;
}

}

那么，有什么方法可以从 OHLCSeries 中检索我自定义 class 的对象吗？

Answer 1

如果您查看 OHLCSeries class 的源代码，您会很快发现问题（在 add(OHCLItem) 方法中）。您将需要创建自己的 CustomOHLCSeries class.

如何扩展 OHLCItem class 并在 OHLCSeries 中使用它

How can I extend an OHLCItem class and use it in OHLCSeries

java

inheritance

jfreechart