Math program problem. Can I have a bit of help please :D

[dylanka]

Hi, so, I am currently doing a Math type program. Basically, I want it to open up a text file, inside the file, it has simple math calculations, like:
4 + 2
3 * 2
5 / 5

So, I want it to solve these equations. I know, I have to read the file, line by line, loop it, and split the line into x, y and the operator. It will then do the calculations, by testing if it is certain operators. Then it will output the original problem, and the answer.

But, what I currently have, is not working. All the answers are coming out as 0, so I dunno what I have done wrong. Here is the code.

import java.io.*;
class Calculator {
	 public static void main(String args[]){
		 int z = 0;
		 try{
			  // Open the file that is the first 
			  // command line parameter
			
			  FileInputStream fstream = new FileInputStream("C:/Test1.txt");
			  
			  // Get the object of DataInputStream
			  
			  DataInputStream in = new DataInputStream(fstream);
			  BufferedReader br = new BufferedReader(new InputStreamReader(in));
			  String strLine = null;
			  
			  //Read File Line By Line
			  
			  while ((strLine = br.readLine()) != null)   {
				  
				  String[] Parts = strLine.split(" ");		
				  
				  String op = Parts[1];						
				  int x = Integer.parseInt(Parts[0]);		
				  int y = Integer.parseInt(Parts[2]);		
				  {
				  
					
					if(op == "+"){						
							z = x + y;					
					  }
						 
					  else if(op == "-"){					
							z = x - y;					
					  }
						 
					  else if(op == "/"){				
							z = x / y;					
					  }
						 
					  else if (op == "*"){					
							z = x * y;					
					  }
					System.out.println(x + " " + op + " " + y + " = " + z);
				  }
				  
			  }
			  //Close the input stream
			  
			  in.close();
			  
			  
		    }catch (Exception e){//Catch exception if any
		    	
		  System.err.println("Error: " + e.getMessage());
		  }
	  }
}

Any help will be appreciated. It is not displaying any errors, I have probably just made a really stupid mistake :p

[SRaith]

You should use equals instead of ==

op.equals("+"),.... and so on...

[dylanka]

You should use equals instead of ==

op.equals("+"),.... and so on...

OMG, yay. Thanks soo much. Works. Wow. Spent ages, looking at everything, except that one part. Woops.