Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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If a class has an array for one of the instance variables, will the toString () method always have a for loop? Why or why not?
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- Help, I making a elevator simulator, I need help in writing code in the Elevator class and it's polymorphism class. I am not sure what to do next. Any help is appreciated. There are 4 types of passengers in the system:Standard: This is the most common type of passenger and has a request percentage of 70%. Standard passengers have no special requirements.VIP: This type of passenger has a request percentage of 10%. VIP passengers are given priority and are more likely to be picked up by express elevators.Freight: This type of passenger has a request percentage of 15%. Freight passengers have large items that need to be transported and are more likely to be picked up by freight elevators.Glass: This type of passenger has a request percentage of 5%. Glass passengers have fragile items that need to be transported and are more likely to be picked up by glass elevators. There are 4 types of elevators in the system:StandardElevator: This is the most common type of elevator and has a request...arrow_forwardplease anser the practice assgnment questions in th images attached. please leave your answer in C++ code ONLYarrow_forwardPart 2: Sorting the WorkOrders via dates Another error that will still be showing is that there is not Comparable/compareTo() method setup on the WorkOrder class file. That is something you need to fix and code. Implement the use of the Comparable interface and add the compareTo() method to the WorkOrder class. The compareTo() method will take a little work here. We are going to compare via the date of the work order. The dates of the WorkOrder are saved in a MM-DD-YYYY format. There is a dash '-' in between each part of the date. You will need to split both the current object's date and the date sent through the compareTo() parameters. You will have three things to compare against. You first need to check the year. If the years are the same value then you need to go another step to check the months, otherwise you compare them with less than or greater than and return the corresponding value. If you have to check the months it would be the same for years. If the months are the same you...arrow_forward
- Use the ArrayList class Add and remove objects from an ArrayList Protect from index errors when removing Practice with input loop Details: This homework is for you to get practice adding and removing objects from an ArrayList. The Voter class was used to create instances of Voters which held their name and a voter identification number as instance variables, and the number of instances created as a static variable. This was the class diagram: The constructor takes a string, passed to the parameter n, which is the name of the voter and which should be assigned to the name instance variable. Every time a new voter is created, the static variable nVoters should be incremented. Also, every time a new voter is created, a new voterID should be constructed by concatenating the string "HI" with the value of nVoters and the length of the name. For example, if the second voter is named "Clark Kent", then the voterID should be "HI210" because 2 is the value of nVoters and 10 is the number...arrow_forwardA for construct is a loop that goes over a list of objects. Consequently, it runs indefinitely if there are items to process. What do you think about this?arrow_forwardAre there obvious improvements that could be made here with respect the software design for Squares and Circles? What programming constructs were you familiar with, and which did you need to look up? Assume we used a separate array for Squares and for Circles rather than one unifying Object array. How would this complicate the task of adding a new Shape (say, a Triangle) to our ObjectList class?arrow_forward
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