Skip current line if this "//" found Scanner

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Java

I'm making Lexical Analyzer and i got stuck in handling Comments .

I'm actually trying to handle that if "//" appears in the file.txt then that line should be ignored and loop must move to next line for more tokens , actually I'm reading the words from file and if white space occurs then that word should be separately stored in arraylist so that I can later compare the keywords with the identifiers etc.

Here is the code:

import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;



public class lex {



	public static void main(String[] args) throws FileNotFoundException {
	
		List<String> al = new ArrayList<String>();		
			
			FileReader fin = new FileReader("C:\\Users\\PHLAMBY\\Desktop\\file.txt");
			Scanner s = new Scanner(fin);		  
		    
			 s.useDelimiter(" ");
			 
			int lineNum;
		    String A ;
		    
		    for(lineNum=1;s.hasNextLine();lineNum++){
				
					 A=s.next();
				 if(!A.contains("//")){					
					 al.add(A);
				 }
				 else
					 break;
		    }
		  
		  
		  for(int i =0 ;i<al.size(); i++){
			 System.out.println(al.get(i));
		  }	 		    
	}}

This is the text file :

{ }* +- ==abstract

// extends testing etc etc

Output :
{
}*
+-

Now, I'm not getting proper output there should be last keyword "==abstract" print but it is not seperating and getting printed and comment is not properly handled.

Thanks in advance!