在字符串中查找字符是否存在：java

Question

I am trying to create a method in Java that does the equivalent to

'Uri.IsHexDigit(char)' in C#. I want to check whether a character is in a set of char arrays to see if it a correct character. Please could anyone look at my code and see what I am doing wrong. Thank you in advance.

Here is my code so far:

public boolean hexChecker(char c)
{
    String string = "0123456789abcdefABCDEF";
    char[] charArray = string.toCharArray();

    for(char ch : charArray)
    {
        if(c == ch)
        {
            System.out.println("It worked!");
            return true;
        }
        else
        {
            System.out.println("It did not work!");
            return false;
        }
    }

    return false;
}

Answer 1

Make life easy. Simply

   public boolean hexChecker(char c) {
        String string = "0123456789abcdefABCDEF";
        return string.indexOf(c) > -1;
    }

Answer 2

You can use regex:

private final static Patter phex = Pattern.compile("[0-9A-F]+");

public boolean hexCharacter(char c) {
   return phex.matcher("" + c).matches();
}