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list vs map

By Obedient OcelotObedient Ocelot on Jan 06, 2021 
LIST: Can store duplicate values,
      Keeps the insertion order. 
      It allows multiple null values, 
      Also we can read a certain value by index.
- ArrayList not syncronized, array based class 
- LinkedList not synchronized, doubly linked
- Vector is synchronized, thread safe
 
 MAP : is a (key-value format) 
      and keys are always unique, 
      and value can be duplicated. 
- HashTable don't have null key, sychronized(thread-safe)
- LinkedHashMap can have null key, keeps order
- HasHMap can have null key, order is not guaranteed
- TreeMap doesn't have null key and keys are sorted

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list vs map

By Obedient OcelotObedient Ocelot on Dec 05, 2020 
List is collection of elements whereas map is collection of key-value pairs.

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difference between list vs set vs map in java

By Obedient OcelotObedient Ocelot on Dec 05, 2020 
Set is unordered
List is ordered collection, 
List allow duplicate elements
Set does not allow duplicates.
List can have multiple null elements
Set will allow only one null element.
The List can contain duplicate elements
Set includes unique items.

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list vs set vs map

By Obedient OcelotObedient Ocelot on Jan 06, 2021 
LIST: Can store duplicate values,
      Keeps the insertion order. 
      It allows multiple null values, 
      Also we can read a certain value by index.
- ArrayList not syncronized, array based class 
- LinkedList not synchronized, doubly linked
- Vector is synchronized, thread safe

SET: Can only store unique values, 
     And does not maintain order
- HashSet can have null, order is not guaranteed
- LinkedHashSet can have null and keeps the order 
- TreeSet sorts the order and don't accept null 

QUQUE : Accepts duplicates, 
        Doesn't have index num,
        First in first our order.  
       
MAP : is a (key-value format) 
      and keys are always unique, 
      and value can be duplicated. 
- HashTable don't have null key, sychronized(thread-safe)
- LinkedHashMap can have null key, keeps order
- HasHMap can have null key, order is not guaranteed
- TreeMap doesn't have null key and keys are sorted

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Given a list of numbers, write a list comprehension that produces a list of only the positive numbers in that list. 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