L3.java

import java.util.ArrayList;

class L3 {

  public static int countKeywords(String keywords) {
    if (keywords.isEmpty()) {
      return 0;
    }

    int Length = 0;
    int Count = 0;
    String[] List = keywords.split(";");
    ArrayList<String> words = new ArrayList<String>();
    ArrayList<String> checked = new ArrayList<>();
    boolean alreadyChecked = false;

    for (int i = 0; i < List.length; i++) {
      words.add(List[i].trim());
    }

    for (int i = 0; i < words.size(); i++) {
      for (int k = 0; k < checked.size(); k++) {
        if (words.get(i).equalsIgnoreCase(checked.get(k))) {
          alreadyChecked = true;
          break;
        }
      }
      if (alreadyChecked == true) {
        continue;
      }
      else if (!words.get(i).isEmpty()) {
        checked.add(words.get(i));
        for (int j = 0; j < words.size(); j++) {
          if (words.get(i).equalsIgnoreCase(words.get(j)) && Count == 0) {
            Length++;
            break;
          }
        }
      }
    }

    return Length;
  }

  public static void main(String[] args) {

    // Test 1
    String test1 = "";
    int result = countKeywords(test1);
    System.out.println("Test 1 result: " + result); // expect 0

    // Test 2
    String test2 = "fruit; vegetables; drinks";
    result = countKeywords(test2);
    System.out.println("Test 2 result: " + result); // expect 3

    // Test 3
    String test3 = "flat white; latte; cappuccino; cafe au lait; mocha";
    result = countKeywords(test3);
    System.out.println("Test 3 result: " + result); // expect 5

    // Test 4
    String test4 = "oolong; ; herbal;  ;;    ; matcha; matcha";
    result = countKeywords(test4);
    System.out.println("Test 4 result: " + result); // expect 3

    // Test 5
    String test5 = ";hoki;;h//;;; ;  ik ; ; ;i;;";
    result = countKeywords(test5);
    System.out.println("Test 5 result: " + result); // expect 4
  }
}