Chapter 9, Problem 7PP

Program Plan Intro

Combined Resistance

Program plan:

Filename: “Circuit.java”

This program file is used to define a class “Circuit”. In the code,

• Define a class “Circuit”.
  • Define the method “getResistance()”.
    • Return “0”.

Filename: “Resistor.java”

This program file is used to define a class “Resistor”. In the code,

• Define a class “Resistor”.
  • Define the class member “resistance”.
  • Define the method “Resistor()”.
    • Set the value of “resistance”.
  • Define the method “getResistance()”.
    • Return the value of “resistance”.

Filename: “Parallel.java”

This program file is used to define a class “Parallel”. In the code,

• Import the required packages.
• Define a class “Parallel” as extending from “Circuit”.
  • Define an array list “circuits”.
  • Define the constructor “Parallel()”.
    • Define the array list.
    • Call the method “design()”.
  • Define the method “add()”.
    • Add “circuit” to array list “circuits”.
  • Define the method “getResistance()”.
    • Define a double variable “sum”.
    • Iterate a “for” loop,
      • Calculate the resistance and add it to “sum”.
        • Return “1/sum”.

Filename: “Serial.java”

This program file is used to define a class “Serial”. In the code,

• Import the required packages.
• Define a class “Serial” as extending from “Circuit”.
  • Define an array list “circuits”.
  • Define the constructor “Serial()”.
    • Define the array list.
    • Call the method “design()”.
  • Define the method “add()”.
    • Add “circuit” to array list “circuits”.
  • Define the method “getResistance()”.
    • Define a double variable “sum”.
    • Iterate a “for” loop,
      • Calculate the resistance and add it to “sum”.
        • Return “1/sum”.

Filename: “CircuitDemo.java”

This program file is used to define a class “CircuitDemo”. In the code,

• Import the required packages.
• Define a class “CircuitDemo”.
  • Define the method “main()”.
    • Define the object “circuit1” of class “Parallel”.
    • Add a new resistor of resistance “100” using “circuit1”.
    • Define the object “circuit2” of class “Serial”.
    • Add a new resistor of resistance “100” using “circuit2”.
    • Add a new resistor of resistance “200” using “circuit2”.
    • Add “circuit1” and “circuit2”.
    • Print the combined resistance.