Question

How to remove the letters from word1 if they do not exist in word2 with Java

Answer 1

public class RemoveNonCommonLetters {
    public static String removeNonCommonLetters(String word1, String word2) {
        StringBuilder result = new StringBuilder();
        
        for (char ch : word1.toCharArray()) {
            if (word2.indexOf(ch) != -1) {
                result.append(ch);
            }
        }
        
        return result.toString();
    }

    public static void main(String[] args) {
        String word1 = "forest";
        String word2 = "tor";

        String result = removeNonCommonLetters(word1, word2);

        System.out.println(result);
    }
}



/*
run:

ort

*/

 

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