Beginner in Java, Eclipse: How call method? (simple)

Question

I am beginner (newbie) in Java. I have downloaded the Eclipse environment to be able to code and run Java programs. Now my problem is simple: I am trying to run the code below, specifically I want to compute the so called edit distance between two words. I do not know how insert an input to this code (very simple right!). Take e.g. w1=labd, w2=blad and w1len=4, w2len=4. How do I insert this as an argument to my function?

CODE

int partDist(String w1, String w2, int w1len, int w2len) {
    if (w1len == 0)
      return w2len;
    if (w2len == 0)
      return w1len;
    int res = partDist(w1, w2, w1len - 1, w2len - 1) + 
    (w1.charAt(w1len - 1) == w2.charAt(w2len - 1) ? 0 : 1);
    int addLetter = partDist(w1, w2, w1len - 1, w2len) + 1;
    if (addLetter < res)
      res = addLetter;
    int deleteLetter = partDist(w1, w2, w1len, w2len - 1) + 1;
    if (deleteLetter < res)
      res = deleteLetter;
    return res;
  }

Should I add some command at the end of the code and run it? What would that be for this particular case?

Do you have a `main` method? Did you research "Hello, world!" in java? — sleepToken, Jan 27 '20 at 12:09
Your application needs an entry point. In java, this is the `main` method. That needs to be part of your class. — f1sh, Jan 27 '20 at 12:11
Hi again, I am sorry but the title was obviously wrong. I am trying to call my function, that's all. No errors! — SimpleProgrammer, Jan 27 '20 at 12:43

score 1 · Accepted Answer · edited Jan 27 '20 at 12:34

1

Place your function 'partDist' inside a class along with a main function and call it from main function like this :

    class YourMainClass{
    public static void main(String args[]){
       System.out.println(partDist("labd", "blad", 4, 4)); // inorder to print the result to console
    }
    int partDist(String w1, String w2, int w1len, int w2len) {
    if (w1len == 0)
      return w2len;
    if (w2len == 0)
      return w1len;
    int res = partDist(w1, w2, w1len - 1, w2len - 1) + 
    (w1.charAt(w1len - 1) == w2.charAt(w2len - 1) ? 0 : 1);
    int addLetter = partDist(w1, w2, w1len - 1, w2len) + 1;
    if (addLetter < res)
      res = addLetter;
    int deleteLetter = partDist(w1, w2, w1len, w2len - 1) + 1;
    if (deleteLetter < res)
      res = deleteLetter;
    return res;
  }
  }

edited Jan 27 '20 at 12:34

f1sh

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answered Jan 27 '20 at 12:21

xplatypus07

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This will not compile since no arguments are provided for the call of `partDist`. – f1sh Jan 27 '20 at 12:30
Thanks for pointing it out ! #Fixed – xplatypus07 Jan 27 '20 at 12:32
That didn't fix anything. I edited your post. – f1sh Jan 27 '20 at 12:34

Beginner in Java, Eclipse: How call method? (simple)

1 Answers1