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abcdefghijklmnopqrstuvwxyz
ABCDEFGHIJKLMNOPQRSTUVWXYZ
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alphabets_l='abcdefghijklmnopqrstuvwxyz'
alphabets_u='ABCDEFGHIJKLMNOPQRSTUVWXYZ'
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['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z']
["a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z"]
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javimport static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;
import org.junit.Test;
/**
* Program to Checks if the CharSequence contains only Unicode letters or digits
* @author javaguides.net
*
*/
public class IsAlphanumericExample {
public static boolean isEmpty(final CharSequence cs) {
return cs == null || cs.length() == 0;
}
public static boolean isAlphanumeric(final CharSequence cs) {
if (isEmpty(cs)) {
return false;
}
final int sz = cs.length();
for (int i = 0; i < sz; i++) {
if (!Character.isLetterOrDigit(cs.charAt(i))) {
return false;
}
}
return true;
}
@Test
public void testIsAlphanumeric() {
assertFalse(isAlphanumeric(null));
assertFalse(isAlphanumeric(""));
assertFalse(isAlphanumeric(" "));
assertTrue(isAlphanumeric("a"));
assertTrue(isAlphanumeric("A"));
assertTrue(isAlphanumeric("kgKgKgKgkgkGkjkjlJlOKLgHdGdHgl"));
assertFalse(isAlphanumeric("ham kso"));
assertTrue(isAlphanumeric("1"));
assertTrue(isAlphanumeric("hkHKHik6iUGHKJgU7tUJgKJGI87GIkug"));
assertFalse(isAlphanumeric("_"));
assertFalse(isAlphanumeric("hkHKHik*khbkuh"));
}
}aguides.net