Accept 2 Strings and display common chars in them [closed]

Answer 1

Use org.apache.commons.lang.StringUtils to count matches like this

    String num1 = "Java";
    String num2 = "Guava";
    int count = 0;
    List charsChecked = new ArrayList<>();

    for(int i = 0;i < num1.length();i++){
        String charToCheck = num1.substring(i, i+1);

        if (!charsChecked.contains(charToCheck)) {
            count += StringUtils.countMatches(num2, charToCheck);
            charsChecked.add(charToCheck);
        }
    }

    System.out.println(count);

This results in the count being 3 in the above example