Example usage for java.lang CharSequence charAt

Introduction

In this page you can find the example usage for java.lang CharSequence charAt.

Prototype

char charAt(int index);

Source Link

Document

Returns the char value at the specified index.

Usage

From source file:com.sjdf.platform.xss.StringUtils.java

/**
 * <p>//from w w  w .  j av a2 s .com
 * Checks if the CharSequence contains only whitespace.
 * </p>
 * <p/>
 * <p>
 * {@code null} will return {@code false}. An empty CharSequence
 * (length()=0) will return {@code true}.
 * </p>
 * <p/>
 * <pre>
 * StringUtils.isWhitespace(null)   = false
 * StringUtils.isWhitespace("")     = true
 * StringUtils.isWhitespace("  ")   = true
 * StringUtils.isWhitespace("abc")  = false
 * StringUtils.isWhitespace("ab2c") = false
 * StringUtils.isWhitespace("ab-c") = false
 * </pre>
 *
 * @param cs the CharSequence to check, may be null
 * @return {@code true} if only contains whitespace, and is non-null
 * @since 3.0 Changed signature from isWhitespace(String) to
 * isWhitespace(CharSequence)
 */
public static boolean isWhitespace(CharSequence cs) {
    if (cs == null) {
        return false;
    }
    int sz = cs.length();
    for (int i = 0; i < sz; i++) {
        if (!Character.isWhitespace(cs.charAt(i))) {
            return false;
        }
    }
    return true;
}

---

From source file:com.sjdf.platform.xss.StringUtils.java

/**
 * <p>/*from  w  ww  .  j a va 2  s .c  o m*/
 * Checks if the CharSequence contains only Unicode letters, digits or space
 * ({@code ' '}).
 * </p>
 * <p/>
 * <p>
 * {@code null} will return {@code false}. An empty CharSequence
 * (length()=0) will return {@code true}.
 * </p>
 * <p/>
 * <pre>
 * StringUtils.isAlphanumericSpace(null)   = false
 * StringUtils.isAlphanumericSpace("")     = true
 * StringUtils.isAlphanumericSpace("  ")   = true
 * StringUtils.isAlphanumericSpace("abc")  = true
 * StringUtils.isAlphanumericSpace("ab c") = true
 * StringUtils.isAlphanumericSpace("ab2c") = true
 * StringUtils.isAlphanumericSpace("ab-c") = false
 * </pre>
 *
 * @param cs the CharSequence to check, may be null
 * @return {@code true} if only contains letters, digits or space, and is
 * non-null
 * @since 3.0 Changed signature from isAlphanumericSpace(String) to
 * isAlphanumericSpace(CharSequence)
 */
public static boolean isAlphanumericSpace(CharSequence cs) {
    if (cs == null) {
        return false;
    }
    int sz = cs.length();
    for (int i = 0; i < sz; i++) {
        if (!Character.isLetterOrDigit(cs.charAt(i)) && cs.charAt(i) != ' ') {
            return false;
        }
    }
    return true;
}

---

From source file:com.sjdf.platform.xss.StringUtils.java

/**
 * <p>//from   www .  j av  a  2s. c  om
 * Checks if the CharSequence contains only ASCII printable characters.
 * </p>
 * <p/>
 * <p>
 * {@code null} will return {@code false}. An empty CharSequence
 * (length()=0) will return {@code true}.
 * </p>
 * <p/>
 * <pre>
 * StringUtils.isAsciiPrintable(null)     = false
 * StringUtils.isAsciiPrintable("")       = true
 * StringUtils.isAsciiPrintable(" ")      = true
 * StringUtils.isAsciiPrintable("Ceki")   = true
 * StringUtils.isAsciiPrintable("ab2c")   = true
 * StringUtils.isAsciiPrintable("!ab-c~") = true
 * StringUtils.isAsciiPrintable("\u0020") = true
 * StringUtils.isAsciiPrintable("\u0021") = true
 * StringUtils.isAsciiPrintable("\u007e") = true
 * StringUtils.isAsciiPrintable("\u007f") = false
 * StringUtils.isAsciiPrintable("Ceki G\u00fclc\u00fc") = false
 * </pre>
 *
 * @param cs the CharSequence to check, may be null
 * @return {@code true} if every character is in the range 32 thru 126
 * @since 3.0 Changed signature from isAsciiPrintable(String) to
 * isAsciiPrintable(CharSequence)
 */
public static boolean isAsciiPrintable(CharSequence cs) {
    if (cs == null) {
        return false;
    }
    int sz = cs.length();
    for (int i = 0; i < sz; i++) {
        if (!CharUtils.isAsciiPrintable(cs.charAt(i))) {
            return false;
        }
    }
    return true;
}

---

From source file:com.sjdf.platform.xss.StringUtils.java

/**
 * <p>/*from www .  ja v  a2s  .c om*/
 * Checks if the CharSequence contains only lowercase characters.
 * </p>
 * <p/>
 * <p>
 * {@code null} will return {@code false}. An empty CharSequence
 * (length()=0) will return {@code false}.
 * </p>
 * <p/>
 * <pre>
 * StringUtils.isAllLowerCase(null)   = false
 * StringUtils.isAllLowerCase("")     = false
 * StringUtils.isAllLowerCase("  ")   = false
 * StringUtils.isAllLowerCase("abc")  = true
 * StringUtils.isAllLowerCase("abC") = false
 * </pre>
 *
 * @param cs the CharSequence to check, may be null
 * @return {@code true} if only contains lowercase characters, and is
 * non-null
 * @since 3.0 Changed signature from isAllLowerCase(String) to
 * isAllLowerCase(CharSequence)
 */
public static boolean isAllLowerCase(CharSequence cs) {
    if (cs == null || isEmpty(cs)) {
        return false;
    }
    int sz = cs.length();
    for (int i = 0; i < sz; i++) {
        if (!Character.isLowerCase(cs.charAt(i))) {
            return false;
        }
    }
    return true;
}

---

From source file:com.sjdf.platform.xss.StringUtils.java

/**
 * <p>//from   w  ww. ja v  a2s .  c om
 * Checks if the CharSequence contains only uppercase characters.
 * </p>
 * <p/>
 * <p>
 * {@code null} will return {@code false}. An empty String (length()=0) will
 * return {@code false}.
 * </p>
 * <p/>
 * <pre>
 * StringUtils.isAllUpperCase(null)   = false
 * StringUtils.isAllUpperCase("")     = false
 * StringUtils.isAllUpperCase("  ")   = false
 * StringUtils.isAllUpperCase("ABC")  = true
 * StringUtils.isAllUpperCase("aBC") = false
 * </pre>
 *
 * @param cs the CharSequence to check, may be null
 * @return {@code true} if only contains uppercase characters, and is
 * non-null
 * @since 3.0 Changed signature from isAllUpperCase(String) to
 * isAllUpperCase(CharSequence)
 */
public static boolean isAllUpperCase(CharSequence cs) {
    if (cs == null || isEmpty(cs)) {
        return false;
    }
    int sz = cs.length();
    for (int i = 0; i < sz; i++) {
        if (!Character.isUpperCase(cs.charAt(i))) {
            return false;
        }
    }
    return true;
}

---

From source file:com.sjdf.platform.xss.StringUtils.java

/**
 * <p>//from   w  ww  .java2  s.  c om
 * Checks if the CharSequence contains only Unicode digits. A decimal point
 * is not a Unicode digit and returns false.
 * </p>
 * <p/>
 * <p>
 * {@code null} will return {@code false}. An empty CharSequence
 * (length()=0) will return {@code false}.
 * </p>
 * <p/>
 * <pre>
 * StringUtils.isNumeric(null)   = false
 * StringUtils.isNumeric("")     = false
 * StringUtils.isNumeric("  ")   = false
 * StringUtils.isNumeric("123")  = true
 * StringUtils.isNumeric("12 3") = false
 * StringUtils.isNumeric("ab2c") = false
 * StringUtils.isNumeric("12-3") = false
 * StringUtils.isNumeric("12.3") = false
 * </pre>
 *
 * @param cs the CharSequence to check, may be null
 * @return {@code true} if only contains digits, and is non-null
 * @since 3.0 Changed "" to return false and not true
 */
public static boolean isNumeric(CharSequence cs) {
    if (cs == null || cs.length() == 0) {
        return false;
    }
    int sz = cs.length();
    for (int i = 0; i < sz; i++) {
        if (!Character.isDigit(cs.charAt(i))) {
            return false;
        }
    }
    return true;
}

---

From source file:com.sjdf.platform.xss.StringUtils.java

/**
 * <p>//from   w ww .ja  v a2s  . c  o  m
 * Checks if the CharSequence contains only Unicode letters.
 * </p>
 * <p/>
 * <p>
 * {@code null} will return {@code false}. An empty CharSequence
 * (length()=0) will return {@code false}.
 * </p>
 * <p/>
 * <pre>
 * StringUtils.isAlpha(null)   = false
 * StringUtils.isAlpha("")     = false
 * StringUtils.isAlpha("  ")   = false
 * StringUtils.isAlpha("abc")  = true
 * StringUtils.isAlpha("ab2c") = false
 * StringUtils.isAlpha("ab-c") = false
 * </pre>
 *
 * @param cs the CharSequence to check, may be null
 * @return {@code true} if only contains letters, and is non-null
 * @since 3.0 Changed "" to return false and not true
 */
public static boolean isAlpha(CharSequence cs) {
    if (cs == null || cs.length() == 0) {
        return false;
    }
    int sz = cs.length();
    for (int i = 0; i < sz; i++) {
        if (!Character.isLetter(cs.charAt(i))) {
            return false;
        }
    }
    return true;
}

---

From source file:com.sjdf.platform.xss.StringUtils.java

/**
 * <p>// www .j a  v  a  2  s.c  o m
 * Checks if the CharSequence contains only Unicode letters or digits.
 * </p>
 * <p/>
 * <p>
 * {@code null} will return {@code false}. An empty CharSequence
 * (length()=0) will return {@code false}.
 * </p>
 * <p/>
 * <pre>
 * StringUtils.isAlphanumeric(null)   = false
 * StringUtils.isAlphanumeric("")     = false
 * StringUtils.isAlphanumeric("  ")   = false
 * StringUtils.isAlphanumeric("abc")  = true
 * StringUtils.isAlphanumeric("ab c") = false
 * StringUtils.isAlphanumeric("ab2c") = true
 * StringUtils.isAlphanumeric("ab-c") = false
 * </pre>
 *
 * @param cs the CharSequence to check, may be null
 * @return {@code true} if only contains letters or digits, and is non-null
 * @since 3.0 Changed "" to return false and not true
 */
public static boolean isAlphanumeric(CharSequence cs) {
    if (cs == null || cs.length() == 0) {
        return false;
    }
    int sz = cs.length();
    for (int i = 0; i < sz; i++) {
        if (!Character.isLetterOrDigit(cs.charAt(i))) {
            return false;
        }
    }
    return true;
}

---

From source file:com.sjdf.platform.xss.StringUtils.java

/**
 * <p>//from www.  j  a va  2  s.c o m
 * Checks if a CharSequence is whitespace, empty ("") or null.
 * </p>
 * <p/>
 * <pre>
 * StringUtils.isBlank(null)      = true
 * StringUtils.isBlank("")        = true
 * StringUtils.isBlank(" ")       = true
 * StringUtils.isBlank("bob")     = false
 * StringUtils.isBlank("  bob  ") = false
 * </pre>
 *
 * @param cs the CharSequence to check, may be null
 * @return {@code true} if the CharSequence is null, empty or whitespace
 * @since 3.0 Changed signature from isBlank(String) to
 * isBlank(CharSequence)
 */
public static boolean isBlank(CharSequence cs) {
    int strLen;
    if (cs == null || (strLen = cs.length()) == 0) {
        return true;
    }
    for (int i = 0; i < strLen; i++) {
        if (!Character.isWhitespace(cs.charAt(i))) {
            return false;
        }
    }
    return true;
}

---

From source file:com.sjdf.platform.xss.StringUtils.java

/**
 * <p>/*from  www .  j a  va 2  s.  c o m*/
 * Checks that the CharSequence does not contain certain characters.
 * </p>
 * <p/>
 * <p>
 * A {@code null} CharSequence will return {@code true}. A {@code null}
 * invalid character array will return {@code true}. An empty CharSequence
 * (length()=0) always returns true.
 * </p>
 * <p/>
 * <pre>
 * StringUtils.containsNone(null, *)       = true
 * StringUtils.containsNone(*, null)       = true
 * StringUtils.containsNone("", *)         = true
 * StringUtils.containsNone("ab", '')      = true
 * StringUtils.containsNone("abab", 'xyz') = true
 * StringUtils.containsNone("ab1", 'xyz')  = true
 * StringUtils.containsNone("abz", 'xyz')  = false
 * </pre>
 *
 * @param cs          the CharSequence to check, may be null
 * @param searchChars an array of invalid chars, may be null
 * @return true if it contains none of the invalid chars, or is null
 * @since 3.0 Changed signature from containsNone(String, char[]) to
 * containsNone(CharSequence, char...)
 */
public static boolean containsNone(CharSequence cs, char... searchChars) {
    if (cs == null || searchChars == null) {
        return true;
    }
    int csLen = cs.length();
    int csLast = csLen - 1;
    int searchLen = searchChars.length;
    int searchLast = searchLen - 1;
    for (int i = 0; i < csLen; i++) {
        char ch = cs.charAt(i);
        for (int j = 0; j < searchLen; j++) {
            if (searchChars[j] == ch) {
                if (Character.isHighSurrogate(ch)) {
                    if (j == searchLast) {
                        // missing low surrogate, fine, like
                        // String.indexOf(String)
                        return false;
                    }
                    if (i < csLast && searchChars[j + 1] == cs.charAt(i + 1)) {
                        return false;
                    }
                } else {
                    // ch is in the Basic Multilingual Plane
                    return false;
                }
            }
        }
    }
    return true;
}

---

• «
• 1
• 2
• 3
• 4
• 5
• 6
• 7
• 8
• 9
• 10
• 11
• 12
• 13
• 14
• 15
• 16
• 17
• 18
• 19
• 20
• 21
• 22
• 23
• 24
• 25
• 26
• 27
• 28
• 29
• 30
• 31
• 32
• 33
• 34
• 35
• 36
• 37
• 38
• 39
• 40
• 41
• 42
• 43
• 44
• 45
• 46
• 47
• »