Why does next() in iterator need to be forcibly converted?

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List<MyFile> myFileList=new LinkedList<>();
Iterator iterator=myFileList.iterator();
    while (iterator.hasNext()){              
        MyFile myFile=(MyFile) iterator.next();
    }

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• Because iterators do not define generics ,next（） Default will return Object, So we need a strong turn .
• Add generics OK,Iterator< MyFile> it = myFileList.iterator();

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