If statement with two conditions not working properly

Question

I am new to programming and I am trying to create a program which parses a file and outputs the tokens. At the minute I am trying to create an if statement which will output the name of each operator with two characters, eg "&&" or "<=". My if statement does not work for "<=" as it picks up the '<" and '=' separately due to the earlier code:

else if (getOp(ch) != null) {
                System.out.println(line + ", " + sglchar + ", "+ ch);
                counter++;
                continue;
            }

My getOp(ch) method contains the operators with one character, however I cannot figure out how to do this with two character operators and my if statements don't seem to be doing the trick.

This is the if statement I am trying:

else if (prog.charAt(counter) == '<' && prog.charAt(counter+1) == '=') {
                    String str = "";
                    str += ch;
                    str += prog.charAt(counter++);
                    System.out.println(line + ", " + getOp(str) + ", " + str);
                    counter++;
                    continue;
                }

Answer 1

As outlined in my comments, use of Java's Scanner class. It makes parsing text files very easy.

Consider the following:

Scanner sc = new Scanner(new File("file.txt"));
while (sc.hasNext()) {
     String token = sc.next(); 
         if (Pattern.matches("<=", token)) {
             System.out.println(token);
         }
}
sc.close();

}

outputs:

   <=