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Занятие 8. Справочник

Сайт: Информатикс
Курс: Фирма "1С". "Алгоритмы. Олимпиадное программирование на языке Java для школьников"
Книга: Занятие 8. Справочник
Напечатано:: Гость
Дата: Пятница, 18 Июль 2025, 07:59

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Занятие 8. Справочник

Полезные функции класса Character

char charValue()
Returns the value of this Character object.
int compareTo(Character anotherCharacter)
Compares two Character objects numerically.
static int digit(char ch, int radix)
Returns the numeric value of the character ch in the specified radix.
static char forDigit(int digit, int radix)
Determines the character representation for a specific digit in the specified radix.
static boolean isDigit(char ch)
Determines if the specified character is a digit.
static boolean isHighSurrogate(char ch)
Determines if the given char value is a high-surrogate code unit (also known as leading-surrogate code unit).
static boolean isLetter(char ch)
Determines if the specified character is a letter.
static boolean isLetter(int codePoint)
Determines if the specified character (Unicode code point) is a letter.
static boolean isLetterOrDigit(char ch)
Determines if the specified character is a letter or digit.
static boolean isLetterOrDigit(int codePoint)
Determines if the specified character (Unicode code point) is a letter or digit.
static boolean isLowerCase(char ch)
Determines if the specified character is a lowercase character.
static boolean isLowerCase(int codePoint)
Determines if the specified character (Unicode code point) is a lowercase character.
static boolean isUpperCase(char ch)
Determines if the specified character is an uppercase character.
static boolean isUpperCase(int codePoint)
Determines if the specified character (Unicode code point) is an uppercase character.
static boolean isWhitespace(char ch)
Determines if the specified character is white space according to Java.
static char toLowerCase(char ch)
Converts the character argument to lowercase using case mapping information from the UnicodeData file.
String toString()
CReturns a String object representing this Character's value.
static String toString(char c)
Returns a String object representing the specified char.
static char toUpperCase(char ch)
Converts the character argument to uppercase using case mapping information from the UnicodeData file.

Полезные функции класса String

char charAt(int index)
Returns the char value at the specified index.
int compareTo(String anotherString)
Compares two strings lexicographically.
int compareToIgnoreCase(String str)
Compares two strings lexicographically, ignoring case differences.
boolean cendsWith(String suffix)
Tests if this string ends with the specified suffix.
byte[] getBytes()
Encodes this String into a sequence of bytes using the platform's default charset, storing the result into a new byte array.
int indexOf(int ch)
Returns the index within this string of the first occurrence of the specified character.
int indexOf(int ch, int fromIndex)
Returns the index within this string of the first occurrence of the specified character, starting the search at the specified index.
int indexOf(int ch, int fromIndex)
Returns the index within this string of the first occurrence of the specified character, starting the search at the specified index.
int indexOf(String str, int fromIndex)
Returns the index within this string of the first occurrence of the specified substring, starting at the specified index.
int lastIndexOf(int ch)
Returns the index within this string of the last occurrence of the specified character.
int lastIndexOf(int ch, int fromIndex)
Returns the index within this string of the last occurrence of the specified character, searching backward starting at the specified index.
int lastIndexOf(String str)
Returns the index within this string of the rightmost occurrence of the specified substring.
int lastIndexOf(String str, int fromIndex)
Returns the index within this string of the last occurrence of the specified substring, searching backward starting at the specified index.
int length()
Returns the length of this string.
String replace(char oldChar, char newChar)
Returns a new string resulting from replacing all occurrences of oldChar in this string with newChar.
String replace(CharSequence target, CharSequence replacement)
Replaces each substring of this string that matches the literal target sequence with the specified literal replacement sequence.
String replaceAll(String regex, String replacement)
Replaces each substring of this string that matches the given regular expression with the given replacement.
String replaceFirst(String regex, String replacement)
Replaces the first substring of this string that matches the given regular expression with the given replacement.
String[] split(String regex)
Splits this string around matches of the given regular expression.
boolean startsWith(String prefix)
Tests if this string starts with the specified prefix.
boolean startsWith(String prefix, int toffset)
Tests if the substring of this string beginning at the specified index starts with the specified prefix.
String substring(int beginIndex)
Returns a new string that is a substring of this string.
String substring(int beginIndex, int endIndex)
Returns a new string that is a substring of this string.
char[] toCharArray()
Converts this string to a new character array.
String toLowerCase()
Converts all of the characters in this String to lower case using the rules of the default locale.
String toUpperCase()
Converts all of the characters in this String to upper case using the rules of the default locale.
String trim()
Returns a copy of the string, with leading and trailing whitespace omitted.
static String valueOf(boolean b)
Returns the string representation of the boolean argument.
static String valueOf(char c)
Returns the string representation of the char argument.
static String valueOf(double d)
Returns the string representation of the double argument.
static String valueOf(float f)
Returns the string representation of the float argument.