java compareTo(Comparable)方法对于Comparable类型未定义
因此,我正在构建一个库作为一个项目,它涵盖了大部分数据结构,而不是所有数据结构,我发现自己遇到了这个问题:
package structure.tree;
import structure.Structure;
import structure.node.BinaryNodeKeyValue;
public class AVLTree<Comparable,V> extends Tree<BinaryNodeKeyValue<Comparable,V>> {
private static final long serialVersionUID = 5046115177325966348L;
public AVLTree(){
}
@Override
public int compareTo(Structure<BinaryNodeKeyValue<Comparable,V>> o) {
// TODO Auto-generated method stub
return 0;
}
@Override
public boolean containsValue(BinaryNodeKeyValue<Comparable,V> elem) {
return containsValueAux(((BinaryNodeKeyValue<Comparable,V>) super.getValue()), elem);
}
private boolean containsValueAux(BinaryNodeKeyValue<Comparable,V> root, BinaryNodeKeyValue<Comparable,V> elem){
if(root == null) return false;
else {
if(root.equals(elem)) return true;
else return containsValueAux(root.getLeft(), elem) || containsValueAux(root.getRight(), elem);
}
}
public boolean containsKey(Comparable key){
return containsKeyAux(((BinaryNodeKeyValue<Comparable,V>) super.getValue()), key);
}
private boolean containsKeyAux(BinaryNodeKeyValue<Comparable,V> root, Comparable key){
if(root == null) return false;
else {
if(root.getKey().compareTo(key) > 0) return containsKeyAux(root.getRight(), key);
else if(root.getKey().compareTo(key) < 0) return containsKeyAux(root.getLeft(), key);
else return true;
}
}
@Override
public void deleteValue(BinaryNodeKeyValue<Comparable,V> elem) {
// TODO Auto-generated method stub
}
@Override
public void insertValue(BinaryNodeKeyValue<Comparable,V> elem) {
// TODO Auto-generated method stub
}
@Override
public BinaryNodeKeyValue<Comparable,V>[] toArray() {
// TODO Auto-generated method stub
return null;
}
public BinaryNodeKeyValue<Comparable,V> get(BinaryNodeKeyValue<Comparable,V> root, Comparable key){
return getAux(root, key);
}
private BinaryNodeKeyValue<Comparable, V> getAux(BinaryNodeKeyValue<Comparable, V> root, Comparable key) {
return null;
}
}
在第40行和第41行(method Containeskeyaux的第3行和第4行),它说“对于可比较的类型,method compareTo(Comparable)是未定义的”,这让我大吃一惊,因为method compareTo实际上只是在可比较的接口中定义的。 VS代码还在第6行向我显示一条警告,说“type参数Comparable正在隐藏type Comparable”,但我正在尝试使Comparable类型尽可能通用,因为节点的键可以是字符串、整数或其他类型的对象
# 1 楼答案
当您声明这样的泛型
AVLTree<Comparable,V>
时,您已经创建了一个类,它有两个泛型类型Comparable和V,Comparable与接口Comparable
无关,它们恰好有相同的名称你可能是说