interface B extends A {}
List<B> blist=new List<B>();
List<A> alist=blist;
alist.add(new A()); //should be ok, right?
B b = blist.get(0); //fail: even though blist is a List<B>, it Now has an A in it
java从List强制转换 **为 B扩展A的列表**
java从List强制转换 **为 B扩展A的列表**
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