Question

VI. Answer part A, B, and C of question 5.

5a)

Given a String str1 and a String str2, return true if str1 contains any character in str2

anyChar("abc", "xyz") → false
anyChar("abc", "xya") → true
anyChar("abc", "xyzxyzbxyzxyz") → true

5b)

Given a String str1 and a String str2, return true if str1 does not contains any character in str2, and false otherwise.

noChar("abc", "xyz") → true
noChar("abc", "xya") → false
noChar("xyzxyzbxyzxyz", "xyzb") → false

5c)

Given a String str1 and a String str2, return true if str1 contains every character in str2. The empty string is contained in any other String, including the empty string itself.

everyChar("abc", "xyz") → false
everyChar("abc", "xya") → false
everyChar("xyzxyzbxyzxyz", "xyzb") → true

Answer 1

// 5a)
public static boolean anyChar(String s1, String s2) {
    for (int i = 0; i < s2.length(); i++) {
        if (s1.contains("" + s2.charAt(i))) {
            return true;
        }
    }
    return false;
}

// 5b)
public static boolean noChar(String s1, String s2) {
    for (int i = 0; i < s2.length(); i++) {
        if (s1.contains("" + s2.charAt(i))) {
            return false;
        }
    }
    return true;
}

// 5c)
public static boolean everyChar(String s1, String s2) {
    for (int i = 0; i < s2.length(); i++) {
        if (!s1.contains("" + s2.charAt(i))) {
            return false;
        }
    }
    return true;
}

public class StringMethods {

    // 5a)
    public static boolean anyChar(String s1, String s2) {
        for (int i = 0; i < s2.length(); i++) {
            if (s1.contains("" + s2.charAt(i))) {
                return true;
            }
        }
        return false;
    }

    // 5b)
    public static boolean noChar(String s1, String s2) {
        for (int i = 0; i < s2.length(); i++) {
            if (s1.contains("" + s2.charAt(i))) {
                return false;
            }
        }
        return true;
    }

    // 5c)
    public static boolean everyChar(String s1, String s2) {
        for (int i = 0; i < s2.length(); i++) {
            if (!s1.contains("" + s2.charAt(i))) {
                return false;
            }
        }
        return true;
    }

    public static void main(String[] args) {
        System.out.println(anyChar("abc", "xyz"));
        System.out.println(anyChar("abc", "xya"));
        System.out.println(anyChar("abc", "xyzxyzbxyzxyz"));

        System.out.println(noChar("abc", "xyz"));
        System.out.println(noChar("abc", "xya"));
        System.out.println(noChar("xyzxyzbxyzxyz", "xyzb"));

        System.out.println(everyChar("abc", "xyz"));
        System.out.println(everyChar("abc", "xya"));
        System.out.println(everyChar("xyzxyzbxyzxyz", "xyzb"));
    }
}