program to extract the full string based on requirement

[pavithra murthy]

HELLO ALL ,

I HAVE A FILE WHICH CONTAINS "MRN 09DE588004180289E0" as a value . the requirement is based on the entry of only MRN it should provide me the next 13 digit number . i have used a bufferedreader and reading through the file but in the condition it seems to fail .earlier i had given a while loop , then now have changed it to nested if statement but even then it is failing . could anyone help me out in this

	//reads the data from document
			  BufferedReader bf = new BufferedReader(new FileReader("d:\\Exportbegleitdokument.PDF"));
			  String search = "MRN";
              System.out.println("Searching for " +search  +" in file...");
			  String line="";
 if  (( line = bf.readLine()) !=null) 
			{
              if ( line =search))
			  {
                                 int indexfound = line.indexOf(search);
                                  indexfound =indexfound+search.length();
								 System.out.println("index:"+indexfound);
						if(indexfound>0)
                        {
                        System.out.println(line.substring(indexfound));
                        }

				  }		

[Scott Stromberg]

Try this...

public static void main(String[] args) throws IOException
	{
		//reads the data from document 
		//it's very unlikely you'll be able to read from a pdf...
		BufferedReader bf = new BufferedReader(new FileReader("text.txt")); 

		String search = "MRN";

		System.out.println("Searching for " +search  +" in file...");  

		String line = bf.readLine(); //null by default

		if(!line.equals(null)) // if the line is not empty 
		{  
			if (line.substring(0,line.indexOf(" ")).equals(search))  //grab the part of the string BEFORE the space
			{  
				String indexfound = line.substring(line.indexOf(" "), line.length());   // grab the part of the string AFTER the space
				System.out.println("Index: " + indexfound); // print what you found
			}
		}
	}

[Piet Verdriet]

Scott Stromberg wrote:Try this...

		String line = bf.readLine(); //null by default

		if(!line.equals(null)) // if the line is not empty 

If 'line' truly was null, a NPE would be thrown.

Better do such checks like this:

if(line != null) {
  // ...
}

[Campbell Ritchie]

Welcome to JavaRanch

There are several other java.lang.String methods, eg beginsWith and endsWith, which I think you might find useful.

[Piet Verdriet]

Campbell Ritchie wrote:Welcome to JavaRanch

...

Thanks Campbell, but I'm not that new here...



<crickets />



Okay, without the non-sense: welcome Scott!
;)

[Rob Spoor]

Campbell Ritchie wrote:beginsWith

startsWith

[Campbell Ritchie]

Thank you, Rob. I could say it was a way of persuading people to look in the API . . . or maybe I forgot the correct name!

And Piet Verdriet,