Chapter 17, Problem 7PC

Program Plan Intro

Generic class to find out largest, smallest, total and average of elements in an ArrayList

Program plan:

• Import the required package.
• Create the class “MyList” with a type parameter “T” that is constrained to an upper bound Number using the keyword extends,
  • Create “ArrayList” as a field of class “MyList” with type parameter “T”.
  • Define the constructor.
  • Define the public method “add()” to accept the parameter of type “T”,
    • Store the value in “ArrayList” using the reference variable “list”.
  • Define the method “largest()”,
    • Call the method “get()” to store the initial value of “ArrayList” in the variable.
    • Iterate the elements of “ArrayList” using “for” loop and compare each value using if statement to find the largest value in the “ArrayList”.
    • Return the largest value using the keyword “return”.
  • Define the method “smallest()”,
    • Call the method “get()” to store the initial value of “ArrayList” in the variable.
    • Iterate the elements of “ArrayList” using “for” loop and compare each value using if statement to find the smallest value in the “ArrayList”.
    • Return the smallest value using the keyword “return”.
  • Define the method “Total()”,
    • Call the method “get()” to store the initial value of “ArrayList” in the variable.
    • Iterate the elements of “ArrayList” using “for” loop and calculate the total value of elements in the “ArrayList”.
    • Return the total value using the keyword “return”.
  • Define the method “Avg()”,
    • Call the method “get()” to store the initial value of “ArrayList” in the variable.
    • Iterate the elements of “ArrayList” using “for” loop and calculate the total value of elements in the “ArrayList”.
    • Calculate and return the average value using the keyword “return”.
• Create the class “Main”,
  • Define the method “main()”,
    • Create the object of a class “MyList” as a type of “Integer”.
    • Call the “add()” method to fill the values in the “ArrayList”.
    • Call the method “largest()” to print the largest value of “ArrayList”.
    • Call the method “smallest()” to print the smallest value of “ArrayList”.
    • Call the method “Total()” to print the total value of elements in the “ArrayList”.
    • Call the method “Avg()” to print the average value of elements in the “ArrayList”.