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Hashtables are important data structures for programming applications. Like arrays and ArrayLists, they can store data in various fields to better organize them. When initializing a new hashtable, after importing the Hashtable class, the code will look something like this: Hashtable hash = new Hashtable(int cap, float lofac); Where "k" is the key to referenced, "v" the the value that will be stored at that key, "cap" is the initial capacity, and "lofac" is the load factor of the table. The initial capacity is the size at which the table is initialized, and the load factor determines how full the table can get before it automatically gets bigger (Oracle, n.d.). An example of where a hashtable might be implemented is a business that assigns each of its employees parking spaces. When an employee is assigned a space, they register the make, model, and plate number of their vehicle. This information gets stored in a hashtable along with a parking space. When new employees, or even old employees with bad memories, need to find their car, they input either the make and model or the plate number of their car. This information is searched for by the table and it returns either the exact space (in the case of a plate number) or a list of probable spaces (in the case of make and model) where the vehicle can be found.

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In java the most important feature for me is thre List data structure. As in todays life list has become the indispensable data structure. It is used in various ways. Using list data structure we can implement stack and queue data structure.Every operating system uses this data structure to store various informations in the sections including disk management,storing page tables in page management and also in free space management tehnique.

As i said before queue and stack which can be implemented using list data structure has vital role in our day to day life. Queue data structure is used in customer care services i.e if the customer calls and there is free offiial the call is forwarded otherwise the cusomer has to wait, it follows the first in fist out principle.In operating systems queue is used to hold the service request of various i/o devices.

Stack is one of the important data structure in which the world runs on.In programming world everything wil involve stack from function calls to balancing of paranthesis.in our day to day life stack is used by online shopping services to store our recently purchased item.In operating systems stack is used in address management.

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