How many null values are allowed in hashmap?
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How do you sort elements in an arraylist?
What is heap tree?
What is the time complexity of hashmap get () and put () method?
How is bubble sort done?
What is the difference between one and two dimensional?
Can we store primitives in collections?
Can you provide some implementation of a dictionary having large number of words?
What is the difference between file structure and storage structure?
Tell me real world example of polymorphism and encapsulation .
Which algorithm is used in collections sort method?
Why sorting algorithms are important?
What are the advantages of merge sort?