String

This section covers String.

String Methods

Category	Method	Description	Example
Returns	`charAt()`	Returns the character at the specified index (position)	`"Hello".charAt(1)` returns `'e'`
	`codePointAt()`	Returns the Unicode of the character at the specified index	`"Hello".codePointAt(1)` returns `101`
	`codePointBefore()`	Returns the Unicode of the character before the specified index	`"Hello".codePointBefore(1)` returns `72`
	`codePointCount()`	Returns the number of Unicode values found in a string.	`"Hello".codePointCount(0, 5)` returns `5`
	`hashCode()`	Returns the hash code of a string	`"Hello".hashCode()` returns `69609650`
	`length()`	Returns the length of a specified string	`"Hello".length()` returns `5`
	`isEmpty()`	Checks whether a string is empty or not	`""isEmpty()` returns `true`
	`toCharArray()`	Converts this string to a new character array	`"Hello".toCharArray()` returns `['H', 'e', 'l', 'l', 'o']`
	`toLowerCase()`	Converts a string to lower case letters	`"Hello".toLowerCase()` returns `"hello"`
	`toString()`	Returns the value of a String object	`String.valueOf(123).toString()` returns `"123"`
	`toUpperCase()`	Converts a string to upper case letters	`"Hello".toUpperCase()` returns `"HELLO"`
	`trim()`	Removes whitespace from both ends of a string	`" Hello ".trim()` returns `"Hello"`
	`valueOf()`	Returns the string representation of the specified value	`String.valueOf(123)` returns `"123"`
Compares	`compareTo()`	Compares two strings lexicographically	`"abc".compareTo("abd")` returns `-1`
	`compareToIgnoreCase()`	Compares two strings lexicographically, ignoring case differences	`"abc".compareToIgnoreCase("ABC")` returns `0`
	`equals()`	Compares two strings. Returns true if the strings are equal, and false if not	`"hello".equals("hello")` returns `true`
	`equalsIgnoreCase()`	Compares two strings, ignoring case considerations	`"hello".equalsIgnoreCase("HELLO")` returns `true`
	`regionMatches()`	Tests if two string regions are equal	`"abcdef".regionMatches(0, "abc", 0, 3)` returns `true`
Searches	`contains()`	Checks whether a string contains a sequence of characters	`"Hello".contains("ell")` returns `true`
	`indexOf()`	Returns the position of the first found occurrence of specified characters in a string	`"Hello".indexOf("l")` returns `2`
	`lastIndexOf()`	Returns the position of the last found occurrence of specified characters in a string	`"Hello".lastIndexOf("l")` returns `3`
	`matches()`	Searches a string for a match against a regular expression, and returns the matches	`"abc123".matches(".\\d.")` returns `true`
Adds	`concat()`	Appends a string to the end of another string	`"Hello".concat(" World")` returns `"Hello World"`
	`join()`	Joins one or more strings with a specified separator	`String.join(", ", "A", "B", "C")` returns `"A, B, C"`
Removes	`replace()`	Searches a string for a specified value, and returns a new string where the specified values are replaced	`"Hello".replace("l", "p")` returns `"Heppo"`
	`replaceAll()`	Replaces each substring of this string that matches the given regular expression with the given replacement	`"Hello".replaceAll("l", "p")` returns `"Heppo"`
	`replaceFirst()`	Replaces the first occurrence of a substring that matches the given regular expression with the given replacement	`"Hello".replaceFirst("l", "p")` returns `"Heplo"`
	`split()`	Splits a string into an array of substrings	`"A,B,C".split(",")` returns `["A", "B", "C"]`
	`subSequence()`	Returns a new character sequence that is a subsequence of this sequence	`"Hello".subSequence(1, 4)` returns `"ell"`

strings_examples.md