DNA Sequencing - Java - Code Academy

DNASequencing.java

// This program recieves a given string in DNA and checks if any proteins are within. 
// Does not consider that multiple proteins could be present. 
//  -. .-.   .-. .-.   .
//    \   \ /   \   \ / 
//   / \   \   / \   \  
//  ~   `-~ `-`   `-~ `-
public class DNA {
  public static void main(String[] args) {
  String dna1 = "ATGCGATACGCTTGA";
  String dna2 = "ATGCGATACGTGA";
  String dna3 = "ATTAATATGTACTGA";
  // Change the value of DNA to check other strings
  String dna = dna1; 
  int start = dna.indexOf("ATG");
  int stop = dna.indexOf("TGA");
  System.out.println(start + " " + stop);
    if (start != -1 && stop != -1 && (stop - start) % 3 == 0) {
    String protein = dna.substring(start, stop+3); 
    System.out.println("Protein: " + protein);
    } else {
    System.out.println("No protein.");
   }

  }

}