java - 有什么方法可以实现比较任何提供的参数的 compareTo 方法吗？

Question

编译器说“找不到符号:方法 compareTo(java.lang.Object)”。能否请您指点这里的错误在哪里？

部分代码如下:

public class OBTComparable<ObjectType> implements Comparable<OBTComparable>
{
    public OTBComparable leftNode = null;
    public OBTComparable mainNode = null;
    public OBTComparable rightNode = null;
    public ObjectType object = null;

    public OBTComparable(ObjectType requiredObject)
    {
        object = requiredObject;
    }

    @Override
    public int compareTo(OBTComparable other)
    {
        if(object.compareTo(other.object) == 0)
            return 0;
        else 
            if (object.compareTo(other.object) > 0)
                return 1;
            else return -1;
    }
}

Answer 1

您需要范围 ObjectType至 Comparable也是，因为OBTComparable是delegating compareTo()至 ObjectType :

如果你改变<ObjectType>至 <ObjectType extends Comparable<ObjectType>> ，它将编译:

public class OBTComparable<ObjectType extends Comparable<ObjectType>> implements Comparable<OBTComparable>