Ok, before everyone gets mad at me for not looking around the board for these topics, I have, but they weren't my problem. My problem I am having is calling the Polynomial class. I know how to call classes in a different class, but this is a bit different. I also realize that this is a homework assignment, and I don't want anyone to do my assignment for me. This is just a step that I am confused about. In addition, I can't just call the Polynomial class because I need to add two polynomials, then in another case subtract, and the other math-type stuff.
Thank you for looking at my thread, if you helped, thanks a lot, if not, thank you for your time to look.
This is my driver class, which all it does so far is basically the menu system.
//Driver
import java.io.*;
import java.util.*;
public class Project6
{
private static Scanner console = new Scanner(System.in);
public static void main(String[] args)
{
//3 instances of the class Polynomial
Polynomial polyAdd = new Polynomial();
Polynomial polySub = new Polynomial();
Polynomial polyMul = new Polynomial();
//Call to menu
menu();
}
public static void menu()
{
//Decalre Variable to record the user's number entered to navigate menu
int choice;
String polynomial1;
String polynomial2;
//Menu print
System.out.println("1. Create a Polynomial from the keyboard.");
System.out.println("2. Add two Polynomials and Display Result.");
System.out.println("3. Subtract two Polynomials and Display Result.");
System.out.println("4. Multiply two Polynomials and Display Result.");
System.out.println("5. Terminate the program");
System.out.println("");
//Take in choice variable to navigate the menu
choice = console.nextInt();
System.out.println("");
//Switch controlling the menu system
switch (choice)
{
//Take in two polynomails
case 1:
System.out.println("Enter the first polynomial.");
polynomial1 = console.next();
System.out.println("Enter the second polynomial.");
polynomial2 = console.next();
System.out.println("");
break;
//Add two Polynomials and Display result
case 2:
System.out.println("");
break;
//Subtract two Polynomials and Display result
case 3:
System.out.println("");
break;
//Multiply two Polynomials and Display result
case 4:
System.out.println("");
break;
//Terminate the program
case 5:
System.exit(0);
break;
//Default
default:
choice = console.nextInt();
console.nextLine();
}
menu();
}
}This is a worker class, and I am trying to call it.
import java.util.*;
public class Polynomial extends UnorderedArrayList<Double>
{
//Default constructor
//Postcondition: An array of the size 100, and
// length and maxSize are set to 100
public Polynomial()
{
super();
length = 100;
}
//Constructor with a parameter
//Postcondition: An array of the size specified by
// the parameter size is created, length
// and maxSize are initialized to size
public Polynomial(int size)
{
super(size);
length = size;
}
//Method to evaluate a polynomial at a given value
//Postcondition: The polynomial is evaluated at x and
// the value is returned
public double evaluate(Double x)
{
double value = 0.0;
Double coeff;
for (int i = 0; i < length; i++)
{
coeff = retrieveAt(i);
if (coeff != 0.0)
value = value + coeff * Math.pow(x, i);
}
return value;
}
//Method to add two polynomials
//Postcondition: This polynomial is added with the polynomial
// specified by the parameter right. A
// reference of the result is returned.
public Polynomial add(Polynomial right)
{
int size = max(length, right.length);
int i;
Double sumCoeff;
Double coeffP;
Double coeffQ;
Polynomial temp = new Polynomial(size);
for (i = 0; i < min(length, right.length); i++)
{
coeffP = retrieveAt(i);
coeffQ = right.retrieveAt(i);
sumCoeff = coeffP + coeffQ;
temp.replaceAt(i, sumCoeff);
}
if (size == length)
for (i = min(length, right.length); i < length; i++)
temp.replaceAt(i, retrieveAt(i));
else
for (i = min(length, right.length);
i < right.length; i++)
temp.replaceAt(i, right.retrieveAt(i));
return temp;
}
//Method to subtract two polynomials
//Postcondition: The polynomial specified by the
// parameter right is subtracted from this
// polynomial. A reference of the result
// is returned.
public Polynomial subtract(Polynomial right)
{
int size = max(length, right.length);
int i;
Double diffCoeff;
Double coeffP;
Double coeffQ;
Polynomial temp = new Polynomial(size);
for (i = 0; i < min(length, right.length); i++)
{
coeffP = retrieveAt(i);
coeffQ = right.retrieveAt(i);
diffCoeff = coeffP - coeffQ;
temp.replaceAt(i, diffCoeff);
}
if (size == length)
for (i = min(length, right.length); i < length; i++)
temp.replaceAt(i, retrieveAt(i));
else
for (i = min(length, right.length);
i < right.length; i++)
{
Double coeff;
coeff = right.retrieveAt(i);
coeff = -coeff;
temp.replaceAt(i, coeff);
}
return temp;
}
//Method to multiply two polynomials
//Postcondition: This polynomial is multiplied with the
// polynomial specified by the parameter right.
// A reference of the result is returned.
public Polynomial multiply(Polynomial right)
{
Polynomial temp = new Polynomial();
System.out.println("See Programming Exercise 5 at "
+ "the end of the chapter.");
return temp;
}
//Method to read the coefficients of a polynomial
public void read()
{
Scanner console = new Scanner(System.in);
Double x;
System.out.println("The degree of this polynomial is: "
+ (length - 1));
for (int i = 0; i < length; i++)
{
System.out.print("Enter the coefficient of x^"
+ i + ": ");
x = console.nextDouble();
replaceAt(i, x);
}
}
//Method to return the string containing the polynomial
public String toString()
{
int i;
int firstNonzeroCoeff = 0;
Double coeff = 0.0;
String str = "";
for (i = 0; i < length; i++)
{
coeff = retrieveAt(i);
if (coeff != 0.0)
{
firstNonzeroCoeff = i;
break;
}
}
if (firstNonzeroCoeff < length)
{
if (firstNonzeroCoeff == 0)
str = retrieveAt(firstNonzeroCoeff) + " ";
else
str = retrieveAt(firstNonzeroCoeff) + "x^"
+ firstNonzeroCoeff + " ";
for (i = firstNonzeroCoeff + 1; i < length; i++)
{
coeff = retrieveAt(i);
if (coeff != 0.0)
if (coeff > 0.0)
str += "+ " + coeff + "x^" + i + " ";
else
str += "- " + (-coeff) + "x^" + i + " ";
}
}
return str;
}
//Method to determine the smaller of x and y
//Postcondition: The smaller of x and y is returned
public int min(int x, int y)
{
if (x <= y)
return x;
else
return y;
}
//Method to determine the larger of x and y
//Postcondition: The larger of x and y is returned
public int max(int x, int y)
{
if (x >= y)
return x;
else
return y;
}
}I included the next class because it was extended in my Polynomial worker class.
public class UnorderedArrayList<T> extends ArrayListClass<T>
{
//Default constructor
public UnorderedArrayList()
{
super();
}
//Constructor with a parameter
public UnorderedArrayList(int size)
{
super(size);
}
//Method to determine whether searchItem is in the list.
//Postcondition: If searchItem is found, returns the
// location in the array where searchItem
// is found; otherwise, returns -1.
public int seqSearch(T searchItem)
{
int loc;
boolean found = false;
for (loc = 0; loc < length; loc++)
if (list[loc].equals(searchItem))
{
found = true;
break;
}
if (found)
return loc;
else
return -1;
} //end seqSearch
//Method to insert insertItem in the list at the position
//specified by location.
//Postcondition: Starting at location, the elements of
// the list are shifted to make room for
// insertItem, list[location] = insertItem;,
// and length++;
// If the list is full or location is out
// of range, an appropriate message is
// output.
public void insertAt(int location, T insertItem)
{
if (location < 0 || location >= maxSize)
System.err.println("The position of the item to "
+ "be inserted is out of range.");
else
if (length >= maxSize) //list is full
System.err.println("Cannot insert in a full "
+ "list.");
else
{
for (int i = length; i > location; i--)
list[i] = list[i - 1]; //move the
//elements down
list[location] = insertItem;
length++; //increment the length
}
} //end insertAt
//Method to insert insertItem at the end of the list.
//Postcondition: list[length] = insertItem; and length++;
// If the list is full, an appropriate
// message is output.
public void insertEnd(T insertItem)
{
if (length >= maxSize) //the list is full
System.err.println("Cannot insert in a full list.");
else
{
list[length] = insertItem; //insert the
//item at the end
length++; //increment the length
}
} //end insertEnd
//Method to replace the element in the list at
//the position specified by location with repItem.
//Postcondition: list[location] = repItem
// If location is out of range, an
// appropriate message is output.
public void replaceAt(int location, T repItem)
{
if (location < 0 || location >= length)
System.err.println("The location of the item to "
+ "be replaced is out of range.");
else
list[location] = repItem;
} //end replaceAt
//Method to remove an item from the list.
//The parameter removeItem specifies the item to
//be removed.
//Postcondition: If removeItem is found in the list, it
// is removed from the list and length is
// decremented by one.
public void remove(T removeItem)
{
int loc;
if (length == 0)
System.err.println("Cannot delete from an "
+ "empty list.");
else
{
loc = seqSearch(removeItem);
if (loc != -1)
removeAt(loc);
else
System.out.println("The item to be deleted "
+ "is not in the list.");
}
} //end remove
}I included this class because it was extended in my UnorderedArrayList class.
public abstract class ArrayListClass<T>
implements ArrayListADT<T>, Cloneable
{
protected int length; //to store the length of the list
protected int maxSize; //to store the maximum size of
//the list
protected T[] list; //array to hold the list elements
//Default constructor
//Creates an array of size 100
//Postcondition: list points to the array, length = 0,
// and maxSize = 100
public ArrayListClass()
{
maxSize = 100;
length = 0;
list = (T[]) new Object[maxSize];
}
//Constructor with a parameter
//Creates an array of the size specified by the
//parameter size.
//Postcondition: list points to the array, length = 0,
// and maxSize = size
public ArrayListClass(int size)
{
if (size <= 0)
{
System.err.println("The array size must be positive. "
+ "Creating an array of size 100. ");
maxSize = 100;
}
else
maxSize = size;
length = 0;
list = (T[]) new Object[maxSize];
}
//Method to determine whether the list is empty.
//Postcondition: Returns true if the list is empty;
// otherwise, returns false.
public boolean isEmpty()
{
return (length == 0);
}
//Method to determine whether the list is full.
//Postcondition: Returns true if the list is full;
// otherwise, returns false.
public boolean isFull()
{
return (length == maxSize);
}
//Method to return the number of elements in the list.
//Postcondition: Returns the value of length.
public int listSize()
{
return length;
}
//Method to return the maximum size of the list.
//Postcondition: Returns the value of maxSize.
public int maxListSize()
{
return maxSize;
}
//Method to output the elements of the list.
//Postcondition: Elements of the list are output on the
//standard output device.
public void print()
{
for (int i = 0; i < length; i++)
System.out.println(list[i]);
System.out.println();
}
//Returns a copy of objects data in store.
//This method clones only the references stored in
//the array. The objects that the array references
//point to are not cloned.
public Object clone()
{
ArrayListClass<T> copy = null;
try
{
copy = (ArrayListClass<T>) super.clone();
}
catch (CloneNotSupportedException e)
{
return null;
}
copy.list = (T[]) list.clone();
return copy;
}
//Method to determine whether item is the same as the item
//in the list at the position specified by location.
//Postcondition: Returns true if list[location] is the
// same as item; otherwise, returns false.
public boolean isItemAtEqual(int location, T item)
{
if (location < 0 || location >= length)
{
System.err.println("The location of the item to "
+ "be compared is out of range.");
return false;
}
return (list[location].equals(item));
}
//Method to remove all the elements from the list.
//Postcondition: length = 0
public void clearList()
{
for (int i = 0; i < length; i++)
list[i] = null;
length = 0;
System.gc(); //invoke garbage collector
} //end clearList
//Method to remove the item from the list at the position
//specified by location.
//Postcondition: The list element at list[location] is
// removed and length is decremented by 1.
// If location is out of range, an
// appropriate message is output.
public void removeAt(int location)
{
if (location < 0 || location >= length)
System.err.println("The location of the item to "
+ "be removed is out of range.");
else
{
for (int i = location; i < length - 1; i++)
list[i] = list[i + 1];
list[length - 1] = null;
length--;
}
} //end removeAt
//Method to retrieve the element from the list at the
//position specified by location.
//Postcondition: A reference of the element at the
// position specified by location is
// returned. If location is out of range,
// an appropriate message is output and
// null is returned.
public T retrieveAt(int location)
{
if (location < 0 || location >= length)
{
System.err.println("The location of the item to be "
+ "retrieved is out of range.");
return null;
}
else
return list[location];
} //end retrieveAt
//Method to insert insertItem in the list at the position
//specified by location.
//Postcondition: Starting at location, the elements of
// the list are shifted to make room for
// insertItem, list[location] = insertItem;,
// and length++;
// If the list is full or location is out
// of range, an appropriate message is
// output.
public abstract void insertAt(int location, T insertItem);
//Method to insert insertItem at the end of the list.
//Postcondition: list[length] = insertItem; and length++;
// If the list is full, an appropriate
// message is output.
public abstract void insertEnd(T insertItem);
//Method to replace the element in the list at
//the position specified by location with repItem.
//Postcondition: list[location] = repItem
// If location is out of range, an
// appropriate message is output.
public abstract void replaceAt(int location, T repItem);
//Method to determine whether searchItem is in the list.
//Postcondition: If searchItem is found, returns the
// location in the array where searchItem
// is found; otherwise, returns -1.
public abstract int seqSearch(T searchItem);
//Method to remove an item from the list.
//The parameter removeItem specifies the item to
//be removed.
//Postcondition: If removeItem is found in the list, it
// is removed from the list and length is
// decremented by one.
public abstract void remove(T removeItem);
}
