How delete "+" from String?

[Dimitri]

Output in console: summ = 5.1+3.14+0+=8.24
How delete last "+" from String? Wich better way? I know one, but musst use if. In programm to much if. And how can without use if?

Code Example:

import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;


public class Runner 
{
	
	public static void main(String[] args) 
	{
	    String path = "in.csv";
	    String line = "";
	    int n = 0; //lenght of array
	    StringBuilder stringForOutput = new StringBuilder();
	    int error = 0;
	    BufferedReader br = null;
	    
	    try
	    {
	    	n = checkArrayLenght(path);
	        br = new BufferedReader(new FileReader(path));
	        String[][] data = new String[n][];
	        int i = 0;
	        
	        
	        while((line = br.readLine()) != null)
	        {
	    	     String[] theLine = line.split(";");
	    	     data[i]  = theLine;
	    	     i++;
	        }
	      		        
	        double summ = 0;
	        stringForOutput.append("Сумма = "); 
	        
		    for(int x = 0; x < data.length; x++)
		    {	               
		    	if(checkString(data[x][0])) 
		    	{
		            int index = Integer.parseInt(data[x][0]);
		            		            
		            if(index < ((data.length)) && index >= 0)
		            {
		                summ = summ + Double.parseDouble(data[x][index]);
		                stringForOutput.append(data[x][index]);
		                stringForOutput.append("+");
		            }
		            else
		            {
		            	++error;
		            }
		    	}	    	
		    	else
		    	{
		    		++error;
		    	}
		    			    	
		    }
		    stringForOutput.append("=" +summ);
	        
	        
	    }
	    catch(FileNotFoundException e)
	    {
	    	e.printStackTrace();
	    }
	    catch(IOException e)
	    {
	    	System.out.println(e);
	    }
	    catch(ArrayIndexOutOfBoundsException e)
	    {
	    	System.out.println(e);
	    }
	    finally
	    {
	    	try
	    	{
	    		br.close();
	    	}
	    	catch(IOException ex)
	    	{
	    		ex.printStackTrace();
	    	}
	    
	        System.out.println(stringForOutput);
	        System.out.println("errors -lines = " + error);
	    }
	    
	    
	}
	
    //check if number 
	public static boolean checkString(String string) 
	{
        try 
        {
            Integer.parseInt(string);
        } 
        catch (Exception e) 
        {
            return false;
        }
        return true;
    }
	
	//check lenght of array
	public static int checkArrayLenght(String path)
			throws FileNotFoundException, IOException
	{
		BufferedReader br = new BufferedReader(new FileReader(path));
	    String line;
	    int lenght = 0;
        while((line = br.readLine()) != null)
        {
        	lenght++;    	     
        }
        return lenght;
	}

}

[ballantony]

A simple way is to use regular expressions

 String sample1 = "Sample String + in middle";
                 String sample2 = "Sample String + at end +";
                 
                 String s1 = sample1.replaceAll("\\+$", "");
                 String s2 = sample2.replaceAll("\\+$", "");
                 
                 System.out.println(s1);
                 System.out.println(s2)

The replaceAll method looks for string 1 and replaces it with string 2 (nothing in this case)
The +$ means look for a + at the end ($) of the line. The \\ escapes the +, ie it looks for a literal + sign.

Search for regexes for more information