範例
public
class
ClassA {
Collection c;
Map m;
public void
methodA() {
m = (Map) c;
// ...
}
}
解決方案
請確定 c 物件是一個 Map
範例
public
class
ClassA {
Collection c;
Map m;
public void
methodA() {
if
(c
isntanceof
Map){
m = (Map) c;
// ...
}
}