Need help with a java program

[dacoolest]

Hi, I have to convert this program (getValue method) to set it to use double inputs instead of int. I've been trying to make changes in it but not getting proper values as the string entered is being converted into the double value by the getValue method. I'm in a very urgent situation and please help me to get it written properly. Thanks.

import java.util.Stack;

public class Expression {
    private String str;
    private Stack<Integer> st2 = new Stack<Integer>();
    private int j = 0;
    
    private void getValue() {
        int sign = -1;
        int nextNumber = 0;
        int prevNumber = 0;
        int value = 0;
        boolean numeric = true;
        
        if (str.charAt(j) == '+') 
        {
            sign = 1;
        }
        else if (str.charAt(j) == '-')
        {
            sign = -1;
        }
        
        j++;
        
        while (numeric == true)
        {
            value += Character.getNumericValue(str.charAt(j));
            if (j != (str.length()-1) )
            {
                nextNumber = Character.getNumericValue(str.charAt(j+1));
                if (nextNumber >= 0 && nextNumber <=9)
                {
                    value = value*10;
                    j++;
                }
                else
                {
                    numeric = false;
 
                }
            }
            else
            {
                numeric = false;
            }
            
        }
        if (sign == -1)
        {
            value = value*-1;
        }
        else if (sign == 1)
        {
            value = value * +1;
        }
        st2.push(value);
    }
    
    private String formatString(String str)
    {
                String temp = "";
        
        Stack<Character> st3 = new Stack<Character> ();
        char ch = ' ';
        int tempNumber = 0;
        
        ch = str.charAt(0);
        if (ch != '+' && ch != '-') 
        {
            st3.push('+');
        }
        
        for (int i = 0; i < str.length(); i++)
        {
            ch = str.charAt(i);
            st3.push(ch);
            if (ch == '*' || ch == '/')
            {
                tempNumber = Character.getNumericValue(str.charAt(i+1));
                if (tempNumber >= 0 && tempNumber<=9)
                {
                    st3.push('+');             
                }
                
            }
        }
        while(st3.isEmpty() == false)
        {
            temp += st3.pop();
        }
        
        str = new StringBuffer(temp).reverse().toString();
        return str;
    }
    
    private void multiply()
    {
        int left = 0;
        int right = 0;
        int value = 0;
        j++;
        getValue();
        right = st2.pop();
        left = st2.pop();
        Multiply m = new Multiply(left,right);
        value = m.evaluate();
        st2.push(value);
    }
    
    private void divide()
    {
        int left = 0;
        int right = 0;
        int value = 0;
        j++;
        getValue();
        right = st2.pop();
        left = st2.pop();
        Divide d = new Divide(left,right);
        value = d.evaluate();
        st2.push(value);
    }
    


    public void handle(String st) 
    {
        int result = 0;
        this.str = formatString(st);
        
        char current = ' ';
        
        for (j = 0; j < str.length(); j++)
        {
           current = str.charAt(j);
           if (current == '+' || current == '-')
           {
               getValue();
           }
           if (current == '*')
           {
               multiply();
           }
           if (current == '/')
           {
               divide();
           }
        }
        
        
        while(st2.isEmpty() == false)
        {
            result += st2.pop();   
        }
        System.out.println(result);
    }   
    
}

[Eranga]

Can you show us what you have tried so far. Then we can comment easily.

[dacoolest]

Hi, thanks for your reply. I managed to get it working. I'm sorry that I could not mention it here. btw, its nice to see that u too from SL.

[Eranga]

If you feel that the solution is something interesting, then post it here. Your solution may helpful to others.

BTW, nice to see you too, from SL.