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for(int i = 0; i < typelist.size(); i++){
System.out.println(typelist.get(i));
//for(Object obj : typelist.get(i)) 错误:can not cast to
//Iterator it = (Iterator) typelist.get(i);
while(it.hashnext){
System.out.println(it.next);错误:can not cast to
}
}