#Java_Interview_Question

139) What is the difference between List and Set?

List can contain duplicate elements whereas Set contains only unique elements.

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140) What is the difference between HashSet and TreeSet?

HashSet maintains no order whereas TreeSet maintains ascending order.

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141) What is the difference between Set and Map?

Set contains values only whereas Map contains key and values both.

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142) What is the difference between HashSet and HashMap?

HashSet contains only values whereas HashMap contains entry(key,value). HashSet can be iterated but HashMap need to convert into Set to be iterated.

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143) What is the difference between HashMap and TreeMap?

HashMap maintains no order but TreeMap maintains ascending order.

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144) What is the difference between HashMap and Hashtable?

1) HashMap is not synchronized. Hashtable is synchronized.
2) HashMap can contain one null key and multiple null values.

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145) What is the difference between Collection and Collections?

Collection is an interface whereas Collections is a class.
Collection interface provides normal functionality of data structure to List, Set and Queue.
But, Collections class is to sort and synchronize collection elements.

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