IndexOutOfBoundsException Index 0 Size 0

I am writing a program that pretty much is taking a string of numbers and operators, splitting them up, then doing the calculations on it. I have four separate IF statements for each operator inside a For loop. The code compiles, but gives me an IndexOutOfBoundsException Index:0 Size:0 at lines 70 and 28. Does anyone have any suggestions as to why this is happening? Thanks.

import java.util.*;
import java.io.*;

public class Lab8
{
public static void main( String[] args)
{
    if ( args.length<1) { System.out.println("FATAL ERROR: Missing expression on command line\nexample: java Lab8 3+13/5-16*3\n"); System.exit(0); }

    String expr= args[0];  // i.e. somethinig like "4+5-12/3.5-5.4*3.14"; 
    System.out.println( "expr: " + expr );
    ArrayList<String> operatorList = new ArrayList<String>();
    ArrayList<String> operandList = new ArrayList<String>();

    StringTokenizer st = new StringTokenizer( expr,"+-*/", true );
    while (st.hasMoreTokens())
    {
        String token = st.nextToken();
        if ("+-/*".contains(token))
            operatorList.add(token);
        else
            operandList.add(token);
        }
    System.out.println("Operators:" + operatorList);
    System.out.println("Operands:" + operandList);

    double result = evaluate( operatorList, operandList );
    System.out.println("The expression: " + expr + " evalutes to " + result + "\n");
} // END MAIN





static double evaluate( ArrayList<String> operatorList, ArrayList<String> operandList)
{
    String operator;
    double result;

    ArrayList<Double> andList = new ArrayList<Double>();

    for( String op : operandList )
    {
        andList.add( Double.parseDouble(op) );
    }

    for(int i=0;i<operatorList.size();++i)
    {
        if(operatorList.get(i).equals("*"))
        {
        operator = operatorList.get(i);
        }
            result = andList.get(i) * andList.get(i+1); 
            andList.set(i,result); 
        //operandList.set(i,result);
            andList.remove(i+1);
            operatorList.remove(i);


        if(operatorList.get(i).equals("/"))
        {
            operator = operatorList.get(i);
        }
            result = andList.get(i) / andList.get(i+1); 
            andList.set(i,result); 
            andList.remove(i+1);
            operatorList.remove(i);



        if(operatorList.get(i).equals("+"))
        {
            operator = operatorList.get(i);
        }   
            result = andList.get(i) + andList.get(i+1);
            andList.set(i,result);
            andList.remove(i+1);
            operatorList.remove(i); 



        if(operatorList.get(i).equals("-"))
        {
            operator = operatorList.get(i);
        }
            result = andList.get(i) - andList.get(i+1);
            andList.set(i,result);
            andList.remove(i+1);
            operatorList.remove(i);

    }

    return andList.get(0);  
}

} //