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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