TCS telephonic Interview questions

Class	Order	Sorting	Duplicates	Nulls	Synchronised
ArrayList	Y	N	Y	Y	N
LinkedList	Y	N	Y	Y	N
Vector	Y	N	Y	Y	Y
Map(Tree Map)	Natural Order But not insertion order	Y	Y	Keys-->No Nulls Values-->Allows multiple	N
HashMap	N	N	Y	Key-->Allow only 1 Null Values-->Allows multiple	N
HashTable	N	N	Y	N	Y
Set(Tree Set)	Natural Order	Y	N	N	N
HashSet	No	N	N	Y	N
LinkedHashSet	N	N	N	Y	N

List maintains Insertion Order
Map maintains Key-Value pair
Set does not allows Duplicates

-->All are not Sync except Vector and HashTable
-->All are not Sorted except TreeMap and TreeSet
-->All allows Null except TreeMap,HashTable,TreeSet
-->All allows Duplicates except Set related




What are Collection Objects in hibernate?

Collection type	Mapping and Description
java.util.Set	This is mapped with a <set> element and initialized with java.util.HashSet
java.util.SortedSet	This is mapped with a <set> element and initialized with java.util.TreeSet. The sort attribute can be set to either a comparator or natural ordering.
java.util.List	This is mapped with a <list> element and initialized with java.util.ArrayList
java.util.Collection	This is mapped with a <bag> or <ibag> element and initialized with java.util.ArrayList
java.util.Map	This is mapped with a <map> element and initialized with java.util.HashMap
java.util.SortedMap	This is mapped with a <map> element and initialized with java.util.TreeMap. The sort attribute can be set to either a comparator or natural ordering.

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