### Question:
CharUtil { public final static boolean isAlphaOrDigit(char c) { return isDigit(c) || isAlpha(c); }  static char toChar(byte b); final static byte[] toSimpleByteArray(char[] carr); final static byte[] toSimpleByteArray(CharSequence charSequence); final static char[] toSimpleCharArray(byte[] barr); final static int toAscii(char c); final static byte[] toAsciiByteArray(char[] carr); final static byte[] toAsciiByteArray(CharSequence charSequence); final static byte[] toRawByteArray(char[] carr); final static char[] toRawCharArray(byte[] barr); final static byte[] toByteArray(char[] carr); final static byte[] toByteArray(char[] carr, String charset); final static char[] toCharArray(byte[] barr); final static char[] toCharArray(byte[] barr, String charset); final static boolean equalsOne(char c, char[] match); final static int findFirstEqual(char[] source, int index, char[] match); final static int findFirstEqual(char[] source, int index, char match); final static int findFirstDiff(char[] source, int index, char[] match); final static int findFirstDiff(char[] source, int index, char match); final static boolean isWhitespace(char c); final static boolean isLowercaseAlpha(char c); final static boolean isUppercaseAlpha(char c); final static boolean isAlphaOrDigit(char c); final static boolean isWordChar(char c); final static boolean isPropertyNameChar(char c); final static boolean isAlpha(char c); final static boolean isDigit(char c); final static boolean isHexDigit(char c); final static boolean isGenericDelimiter(int c); final static boolean isSubDelimiter(int c); final static boolean isReserved(char c); final static boolean isUnreserved(char c); final static boolean isPchar(char c); final static char toUpperAscii(char c); final static char toLowerAscii(char c);  }### Answer:
@Test public void testIsAlphaOrDigit() { }