Checking each character for a number

Question

I am trying to loop through a string and check each character if one of the characters is a number. If it is a number, I want to return it as true. I have a string \"crash\"

Answer 1

Your code should work correctly, although I would probably use this instead:

public boolean isNumber(String newString)
{
    for (int i=0; i != newString.length(); i++)
    {
        if (!Character.isDigit(newString.charAt(i))) 
        {
            return false;
        }
    }
    return true;
}

// a regex equivalent
public boolean isNumberRegex(String newString)
{
    return newString.match("\\d+");
}

The method above checks if all characters are digits.

If I misunderstood your question and you want to check if any of the characters is a digit:

public boolean hasNumber(String newString)
{
    for (int i=0; i != newString.length(); i++)
    {
        if (Character.isDigit(newString.charAt(i))) 
        {
            return true;
        }
    }
    return false;
}

// regex equivalent
public boolean hasNumberRegex(String newString)
{
    return newString.match(".*\\d.*");
}