In Java, can I test weather a char equals an entire set?

Question

for example, could I say

if ( a != (A-Z) || a != (a- z) || a!=(0-9) )

?

is it possible? or how could it be done? thanks!

I forgot the single quotes around the characters. But the question is the same.

Answer 1

Create your set like this:

HashSet mySet = new HashSet();
//add the chars that you want to consider
mySet.add( new Character( 'd' ) );
mySet.add( new Character( 'e' ) );

// and test
if ( mySet.contains( new Char( testChar ) )
{
do something.
}

you can try also by

if ( testChar < 'a' && testChar > 'z' )
{

}

Answer 2

i think there is two ways of doing this depending on the version of java you are useing:

1st:
public boolean valid(char c) {
int x = (int)c; // ascii value of c
return ((x >= 48 && x <= 57) || (x >= 65 && x <= 90) || (x >= 97 && x <= 122));
}

this will compare your char to ascii alphanumeric characters.

2nd:
use a regex learn here at sun
http://java.sun.com/docs/books/tutorial/essential/regex/intro.html

Answer 3

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