我有一个问题：我在
Eclipse的环境中工作.
有时计算机不会给出以下转换：
int a ...
Object ans = (int) a;
但只有这种转换：
int a ...
Object ans = (Integer) a;
我明白为什么你可以在Object to Integer之间进行转换,但为什么是原始变量 – 有时你可以,有时候你不能进行转换？
谢谢
我附加编译器不允许我在int变量和object之间进行转换的代码：
/** @return minimum element */
public Object minimum(){
return minimum(this.root);
}
public Object minimum(BSTNode node){
if (node.left != null) return minimum(node.left);
return node.data;
}
/** @return maximum element */
public Object maximum(){
return maximum(this.root);
}
public Object maximum(BSTNode node){
if (node.right != null) return maximum(node.right);
return node.data;
}
public Object findNearestSmall(Object elem) {
int diff;
diff = (int)maximum() - (int)minimum();
if (compare(minimum(), elem) == 0) return elem;
else return findNearestSmall(elem, this.root, diff);
}
public Object findNearestSmall(Object elem, BSTNode node, int mindiff){
if(node == null) return (int)elem - mindiff;
int diff = (int)elem - (int)node.data;
if(diff > 0 && mindiff > diff) mindiff = diff;
/* Case 2 : Look for in left subtree */
if(compare(node.data, elem)>-1)
return findNearestSmall(elem, node.left, mindiff);
else
/* Case 3 : Look for in right subtree */
return findNearestSmall(elem, node.right, mindiff);
}