Make Collections
readOnly
To make the Collection readOnly,
we can use static methods of Collections class
Collections.unmodifiableCollection(Collection
c)
Collections.unmodifiableMap(Map
m)
Collections.unmodifiableList(List
l)
Collections.unmodifiableSet(Set
s)
If any add or remove operation
will perform on the readOnly collection, it will throw UnSupportedOperationException.
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