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Demonstration of Non-Empty immutable list
jshell> List immutableList = List.of("Smart","Techie");
immutableList ==> [Smart, Techie]
jshell> //add an item to the list
jshell> immutableList.add("Smart_1");
| Warning:
| unchecked call to add(E) as a member of the raw type java.util.List
| immutableList.add("Smart_1");
| ^--------------------------^
| java.lang.UnsupportedOperationException thrown:
| at ImmutableCollections.uoe (ImmutableCollections.java:70)
| at ImmutableCollections$AbstractImmutableList.add (ImmutableCollections.java:76)
| at (#2:1)
jshell>
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