Need help with this in java

The task of this project is to implement in Java several variations of the in-place QuickSort algorithm, each with a different choice of pivot. You should note the impact on execution time of different pivot selection strategies. Specification The project must implement the following specification exactly, including all identifier names, method signatures, the presence or absence of exceptional behavior, etc. That being said anything not clearly indicated by the UML diagram(s) or explicitly stated in the description is left up to your discretion. You may also add private helper methods or additional fields as necessary Structure QuickSorter static+timedQuickSort>list: ArrayList, pivotStrategy: PivotStrategy): Duration (throws NullPointerException static+generateRandomList(size: int): ArrayListcintegerthrows IllegalArgumentException) enumeration PivotStrategy FIRST_ELEMENT RANDOM ELEMENT MEDIAN OF_THREE_ELEMENTS MEDIAN OF_THREE_RANDOM _ELEMENTS QuickSorter is a static utility class -as such, it should contain only static members and should never be instantiated as an object. The PivotStrategy enumeration should be exactly bundled with (i.e. contained within) QuickSorter, but should be publicly accessible since access to it is required for clients to invoke the timedQuickSort method. The timedQuickSort method is a generic_method that has a type parameter extending va.lang.Comparable, and that returns an instance of java.time Duration For this project, your implementation should not rely on the default package rather you should locate your project in a package exactly named "edu.utdallas.cs3345.project5". This name emulates the official Java package naming conventions, if you're curious Behavion timedQuickSort should accept an array-based list, sort it in-place using the QuickSort algorithm with the specified pivot selection strategy, and return the time in nanoseconds that it took to sort the list. This method should immediately throw a NullPointerException with an appropriate message if either argument is null. This method should not throw any other The task of this project is to implement in Java several variations of the in-place QuickSort algorithm, each with a different choice of pivot. You should note the impact on execution time of different pivot selection strategies. Specification The project must implement the following specification exactly, including all identifier names, method signatures, the presence or absence of exceptional behavior, etc. That being said anything not clearly indicated by the UML diagram(s) or explicitly stated in the description is left up to your discretion. You may also add private helper methods or additional fields as necessary Structure QuickSorter static+timedQuickSort>list: ArrayList, pivotStrategy: PivotStrategy): Duration (throws NullPointerException static+generateRandomList(size: int): ArrayListcintegerthrows IllegalArgumentException) enumeration PivotStrategy FIRST_ELEMENT RANDOM ELEMENT MEDIAN OF_THREE_ELEMENTS MEDIAN OF_THREE_RANDOM _ELEMENTS QuickSorter is a static utility class -as such, it should contain only static members and should never be instantiated as an object. The PivotStrategy enumeration should be exactly bundled with (i.e. contained within) QuickSorter, but should be publicly accessible since access to it is required for clients to invoke the timedQuickSort method. The timedQuickSort method is a generic_method that has a type parameter extending va.lang.Comparable, and that returns an instance of java.time Duration For this project, your implementation should not rely on the default package rather you should locate your project in a package exactly named "edu.utdallas.cs3345.project5". This name emulates the official Java package naming conventions, if you're curious Behavion timedQuickSort should accept an array-based list, sort it in-place using the QuickSort algorithm with the specified pivot selection strategy, and return the time in nanoseconds that it took to sort the list. This method should immediately throw a NullPointerException with an appropriate message if either argument is null. This method should not throw any other