package java.lang;

public final class Character {
  public static final Class TYPE = Class.forCanonicalName("C");

  private final char value;

  public Character(char value) {
    this.value = value;
  }

  public static Character valueOf(char value) {
    return new Character(value);
  }

  public boolean equals(Object o) {
    return o instanceof Character && ((Character) o).value == value;
  }

  public int hashCode() {
    return (int) value;
  }

  public String toString() {
    return toString(value);
  }

  public static String toString(char v) {
    return new String(new char[] { v });
  }

  public char charValue() {
    return value;
  }

  public static char toLowerCase(char c) {
    if (c >= 'A' && c <= 'Z') {
      return (char) ((c - 'A') + 'a');
    } else {
      return c;
    }
  }

  public static char toUpperCase(char c) {
    if (c >= 'a' && c <= 'z') {
      return (char) ((c - 'a') + 'A');
    } else {
      return c;
    }
  }

  public static boolean isDigit(char c) {
    return c >= '0' && c <= '9';
  }

  public static boolean isLetter(char c) {
    return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z');
  }

  public static boolean isLetterOrDigit(char c) {
    return isDigit(c) || isLetter(c);
  }

  public static boolean isLowerCase(char c) {
    return (c >= 'a' && c <= 'z');
  }

  public static boolean isUpperCase(char c) {
    return (c >= 'A' && c <= 'Z');
  }

  public static boolean isWhitespace(char c) {
    return c == ' ' || c == '\t' || c == '\n' || c == '\r';
  }

  public static boolean isSpaceChar(char c) {
    return isWhitespace(c);
  }
}