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Read Special Character in java Strings

Anonymous User 2049 29 Dec 2015

I want to test wheather my input string conatins any special characters or not. Is there any good techniques for impelmting this?

I am using charAt() and ASCII values

for(int i=0;i<s.length();i++)
{
    char c=s.charAt(i);
    if(65<=c<=90)
    {
        System.out.println("Valid");
    }
    else if(97<=c<=122)
    {
        System.out.println("Invalid as it contains lower case letter");
        break;
    }
    else if(48<=c<=57)
    {
        System.out.println("Invalid as it contains numbers");
        break;
    }
    else
        System.out.println("Invalid as it contains special characters");
}

Ask by Anonymous User

Updated 29 Dec 2015

1 Answers

Anonymous User 29 Dec 2015

The problem you have is that something like this: 65<=c<=90 will not work in java. You can't chain compares!

You'll have to write something like this:

if (65 <= c && c <= 90)

Or to increase readability i'd suggest you to do something like this:

if ('A' <= c && c <= 'Z')

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