How to check if a string contains the characters from another string in Java?

Question

I am using Java 8. Suppose I have two Strings a=helloworld and b=howareyou respectively. I want to find out the matching characters of String b from String a along with their position in b. As in my example the matching characters are h,e,o,w,r and r is the 5th character in string b. I don't want to find if it is the substring or not. I just want to check if the characters of one string are present in another string or not. Is there any way to do that? Below is my Java Code.

public class CharCheck {
public static void main(String[] args) {
    String a = "helloworld";
    String b = "howareyou";

    char st = containsAny(a, b);

    System.out.println(st+", ");
}

private static char containsAny(String str1, String str2) {
    if (str1 == null || str1.length() == 0 || str2 == null || str2.length() == 0) {
        if (str1 == null || str1.length() == 0) {
            return 'X';
        }
    }
    for (int i = 0; i < str1.length(); i++) {
        char ch = str1.charAt(i);
        for (int j = 0; j < str2.length(); j++) {
            if (str2.charAt(i) == ch) {
                return ch;
            }
        }
    }
    return 'X';
   }
}

So you basically want to find which characters from String2 are contained in String1? What have you tried? — AntonH, Sep 11 '17 at 21:10
@CedricMartens: wrong language. This is Java, that question was about Javascript. — Hovercraft Full Of Eels, Sep 11 '17 at 21:16
@HovercraftFullOfEels I have edited my question. Please read it carefully. My question differs from other questions. — WASEEM, Sep 11 '17 at 21:50
@CedricMartens My question is regarding `java` language and its not about finding substring. — WASEEM, Sep 11 '17 at 21:51
Don't mark this question as duplicate until and unless you have read my question properly. — WASEEM, Sep 11 '17 at 21:53

score 1 · Accepted Answer · answered Sep 11 '17 at 21:24

Im not going to implement the solution for you but I'll give you the pusedocode.

for each letter1 in String1 
     for each letter2 in String2 
          if letter1 is letter2 then print its position

So you know you will need a nested for loop and a comparison, it becomes a bit more complicated if you want unique duplicates but i'll leave the rest up to you

How to check if a string contains the characters from another string in Java?

1 Answers1