示例
public
class
ClassA {
Collection c;
Map m;
public void
methodA() {
m = (Map) c;
// ...
}
}
解决方案
确保对象 c 是 Map
示例
public
class
ClassA {
Collection c;
Map m;
public void
methodA() {
if
(c
isntanceof
Map){
m = (Map) c;
// ...
}
}