solver

// A+ Computer Science  -  www.apluscompsci.com
//Name - Sudeep Ghantasala
//Date - January 14, 2015
//Class - AP Computer Science
//Lab  - ArrayLists

import java.util.ArrayList;
import java.util.Scanner;
import static java.lang.Integer.*;
import static java.lang.System.*;

public class ExpressionSolver
{
	//add in instance variables
	private String finale;
	private int Mult, Div, Add, Sub;
	private ArrayList<String>lol;
	public ExpressionSolver(String s)
	{
		finale = s;
	}

	public void setExpression(String s)
	{
		finale = s;
	}

	public void solveExpression()
	{
		Scanner string = new Scanner(finale);
		while(string.hasNext())  {
			lol.add(string.next());
		}
		int Div = lol.indexOf("/");
		int Mult = lol.indexOf("*");
		int Add = lol.indexOf("+");
		int Sub = lol.indexOf("-");

		while(Mult > -1 || Div > -1){
			if((Mult > Div && Div != -1) || (Div > -1 && Mult == -1 && Div != -1)){
				int quotient = Integer.parseInt(lol.get(Div-1)) / Integer.parseInt(lol.get(Div+1));
				String lString = quotient + "";
				lol.remove(Div-1);
				lol.remove(Div-1);
				lol.remove(Div-1);
				lol.add(Div - 1, lString);
				Mult = lol.indexOf("*");
				Div = lol.indexOf("/");
				Add = lol.indexOf("+");
				Sub = lol.indexOf("-");
			}
			else if((Mult < Div && Mult != -1) || (Mult > -1 && Div == -1 && Mult != -1)){
				int product = Integer.parseInt(lol.get(Mult-1)) * Integer.parseInt(lol.get(Mult+1));
				String lString = product + "";
				lol.remove(Mult-1);
				lol.remove(Mult-1);
				lol.remove(Mult-1);
				lol.add(Mult - 1, lString);
				Mult = lol.indexOf("*");
				Div = lol.indexOf("/");
				Add = lol.indexOf("+");
				Sub = lol.indexOf("-");
			}
		}

		while (Add > -1 || Sub > -1) {
			if((Add < Sub && Add != -1) || (Add > -1 && Sub == -1)){
				int Num = Integer.parseInt(lol.get(Add-1)) + Integer.parseInt(lol.get(Add+1));
				String lString = Num + "";
				lol.remove(Add-1);
				lol.remove(Add - 1);
				lol.remove(Add - 1);
				lol.add(Add-1, lString);
				Mult = lol.indexOf("*");
				Div = lol.indexOf("/");
				Add = lol.indexOf("+");
				Sub = lol.indexOf("-");
			}

			else if((Mult < Div && Mult != -1) || (Mult > -1 && Div == -1 && Mult != -1)){
				int product = Integer.parseInt(lol.get(Mult-1)) * Integer.parseInt(lol.get(Mult+1));
				String lString = product + "";
				lol.remove(Mult-1);
				lol.remove(Mult-1);
				lol.remove(Mult-1);
				lol.add(Mult - 1, lString);
				Mult = lol.indexOf("*");
				Div = lol.indexOf("/");
				Add = lol.indexOf("+");
				Sub = lol.indexOf("-");
			}

}



}
	public String toString( )
	{
		return finale + " = " + lol.get(0);
	}
}