Problems with a Java infix converter

[Kelly Q]

I am having trouble getting my infix converter to work properly, I am kinda a newbee at programing and this is really killing me. I havent yet tried to incorporate parentheses yet but that is my next step.

package infix_postfix;
 
import java.util.*;
public class Main {
 
 
    public static void main(String[] args) {
 Stack   stack  = new  Stack(); //uses java built in stack
String input_string;
Scanner input = new Scanner(System.in);
int order=0;
String temp="";
String out="";
            System.out.println("Infix Converter: V.1.0 Kelly Qualls");
            System.out.println("This program is designed to take binary operators"
                + " including parenthetical math to be able to show the postfix"
                + " equivilent");
            System.out.println("Please enter the infix notation:>");
 
            input_string=input.nextLine();
           // String delims = "[+\\-*/\\^ ]+"; // so the delimiters are:  + - * / ^ space
            String[] tokens = input_string.split("(?<=[ +\\-*/\\^ ]+)");
            stack.push("out");
for (int i = 0; i < tokens.length; i++)
            {
if (tokens[i].equals("+"))
                {
                temp=(String)stack.peek();
                if(temp.equals("out"))
                    {
                        stack.push("+");
                    }
                else{
                    if(temp.equals("*")||temp.equals("/"))
                        {
                        out += stack.pop();
                        stack.push("+");
                        }
                    else
                        stack.push("+");
                }
                }
else if(tokens[i].equals("-"))
                 {
                temp=(String)stack.peek();
                if(temp.equals("out"))
                    {
                        stack.push("-");
                    }
                else{
                    if(temp.equals("*")||temp.equals("/"))
                        {
                        out += stack.pop();
                        stack.push("-");
                        }
                    else
                        stack.push("-");
                }
                }
else if(tokens[i].equals("/"))
                {
                temp=(String)stack.peek();
                if(temp.equals("out"))
                    {
                        stack.push("/");
                    }
                else{
                    if(temp.equals("*")||temp.equals("/"))
                        {
                        out += stack.pop();
                        stack.push("/");
                        }
                    else
                        stack.push("/");
                }
                }
else if(tokens[i].equals("*"))
                {
                temp=(String)stack.peek();
                if(temp.equals("out"))
                    {
                        stack.push("*");
                    }
                else{
                    if(temp.equals("*")||temp.equals("/"))
                        {
                        out += stack.pop();
                        stack.push("*");
                        }
                    else
                        stack.push("*");
                }
                }
            else {
                out += tokens[i];
                temp= (String)stack.peek();
 
            }
 
}
            while(!temp.equals("out"))
                {
                    out+=stack.pop();
                    temp=(String)stack.peek();
                }
           // order++;
 
 
            System.out.println(out);
 
}
}
 
 

[Dheeraj Joshi]

Every time your for loop executes else condition in lone number 94. It won't execute any other if conditions. Please debug the code to see your self what is going wrong.

else {
   out += tokens[i];
   temp= (String)stack.peek();
}
 

Also Please see the variables in tokens array and see the problem with it.

Regards
Dheeraj Joshi