Chapter 9, Problem 15PP

Program Plan Intro

Implementation of “FirstDigitDistribution” class

Program plan:

• In a file “Sequence .java”,
  • Create a package.
  • Create an interface “Sequence”,
    • Declare the method “next()”.
• In a file “RandomSequence .java”,
  • Create a package.
  • Import necessary package.
  • Create a class “RandomSequence”,
    • Define the method “next()”,
      • Create “Random” object.
      • Return the random number.
• In a file “SquareSequence .java”,
  • Create a package.
  • Create a class “SquareSequence”,
    • Declare the variable.
    • Define the method “next()”,
      • Increment the variable.
      • Return the multiplied value.
• In a file “FirstDigitDistribution .java”,
  • Create a package.
  • Create a class “FirstDigitDistribution”,
    • Declare the array for counter.
    • Define the constructor,
      • Set the counter array.
        • Define the method “process()”,
        • • Create loop till the value to be processed,
            • Assign the value returned from “next()”.
            • Check whether the value is negative,
              • Subtract the value from the same value.
            • Execute till the value greater than or equal to “10”,
              • Compute one’s place value.
            • Compute the first digit.
            • Increment the last value in the array.
        • Define the method “display()”,
        • • Create loop for “10” times,
            • Print the position with value.
• In a file “SequenceDemo.java”,
  • Create a package.
  • Create a class “SequenceDemo”,
    • Define the method “main()”
      • Create object for “FirstDigitDistribution”.
      • Call the method “process()”.
      • Call the method “display()”
      • Print new line.
      • Create another object for “FirstDigitDistribution”.
      • Call the method “process()”.
      • Call the method “display()”.