How to ensure that collections in Java contain only one type?
I want to make sure that the collection can only hold one type
It can be said that there is such a method
public Collection<Students> getStudents();
You can write the following code
Collection students = getStudents(); students.add(new Book());
This book does not extend to students Now the collection student contains an incorrect object How can I ensure that this line collection students = getstudents(); impossible?
Solution
If you use collections every time you instantiate a collection Checkedcollection(), it can be enforced at run time There is no denying that it will be a little painful
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