Client and backend. This class is shared: the same code is compiled into your app and into your server, so everything on this page works in both.

public final class String

Object
String

ImplementsCharSequence, Comparable<String>

The String class represents character strings. All string literals in Java programs, such as “abc”, are implemented as instances of this class. Strings are constant; their values cannot be changed after they are created. String buffers support mutable strings. Because String objects are immutable they can be shared. For example: is equivalent to: Here are some more examples of how strings can be used: The class String includes methods for examining individual characters of the sequence, for comparing strings, for searching strings, for extracting substrings, and for creating a copy of a string with all characters translated to uppercase or to lowercase. The Java language provides special support for the string concatenation operator (+), and for conversion of other objects to strings. String concatenation is implemented through the StringBuffer class and its append method. String conversions are implemented through the method toString, defined by Object and inherited by all classes in Java. For additional information on string concatenation and conversion, see Gosling, Joy, and Steele, The Java Language Specification. Since: JDK1.0, CLDC 1.0 See Also:Object.toString(), StringBuffer, StringBuffer.append(boolean), StringBuffer.append(char), StringBuffer.append(char[]), StringBuffer.append(char[], int, int), StringBuffer.append(int), StringBuffer.append(long), StringBuffer.append(java.lang.Object), StringBuffer.append(java.lang.String)

Fields

public static final Comparator<String> CASE_INSENSITIVE_ORDER

Constructors

`public String()`	Initializes a newly created String object so that it represents an empty character sequence.
`public String(byte[] bytes)`	Construct a new String by converting the specified array of bytes using the platform’s default character encoding.
`public String(byte[] bytes, int off, int len)`	Construct a new String by converting the specified subarray of bytes using the platform’s default character encoding.
`public String(byte[] bytes, int off, int len,` `String enc) throws UnsupportedEncodingException`	Construct a new String by converting the specified subarray of bytes using the specified character encoding.
`public String(byte[] bytes,` `Charset charset)`	Construct a new String by converting the specified array of bytes using the specified character encoding.
`public String(byte[] bytes,` `String enc) throws UnsupportedEncodingException`	Construct a new String by converting the specified array of bytes using the specified character encoding.
`public String(char[] value)`	Allocates a new String so that it represents the sequence of characters currently contained in the character array argument.
`public String(char[] value, int offset, int count)`	Allocates a new String that contains characters from a subarray of the character array argument.
`public String(String value)`	Initializes a newly created String object so that it represents the same sequence of characters as the argument; in other words, the newly created string is a copy of the argument string.
`public String(StringBuffer buffer)`	Allocates a new string that contains the sequence of characters currently contained in the string buffer argument.
`public String(StringBuilder buffer)`
`public String(int[] codePoints, int offset, int count)`	A string of the code points `codePoints[offset]` to `codePoints[offset + count - 1]`.
`public String(byte[] bytes, int offset, int length,` `Charset charset)`	Decodes `length` bytes of `bytes` from `offset` with `charset`.

Methods

`public char charAt(int index)`	Returns the character at the specified index.
`public int compareTo(String anotherString)`	Compares two strings lexicographically.
`public int compareToIgnoreCase(String anotherString)`
`public boolean contentEquals(CharSequence cs)`
`public boolean contentEquals(StringBuffer sb)`
`public static` `String copyValueOf(char[] data)`
`public static` `String copyValueOf(char[] data, int offset, int count)`
`public` `String concat(String str)`	Concatenates the specified string to the end of this string.
`public boolean endsWith(String suffix)`	Tests if this string ends with the specified suffix.
`public boolean equals(Object anObject)`	Compares this string to the specified object.
`public boolean equalsIgnoreCase(String anotherString)`	Compares this String to another String, ignoring case considerations.
`public byte[] getBytes()`	Convert this String into bytes according to the platform’s default character encoding, storing the result into a new byte array.
`public byte[] getBytes(String enc) throws UnsupportedEncodingException`	Convert this String into bytes according to the specified character encoding, storing the result into a new byte array.
`public byte[] getBytes(Charset charset)`	Convert this String into bytes according to the specified character encoding, storing the result into a new byte array.
`public void getChars(int srcBegin, int srcEnd, char[] dst, int dstBegin)`	Copies characters from this string into the destination character array.
`public int hashCode()`	Returns a hashcode for this string.
`public int indexOf(int ch)`	Returns the index within this string of the first occurrence of the specified character.
`public 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.
`public int indexOf(String str)`	Returns the index within this string of the first occurrence of the specified substring.
`public 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.
`public` `String intern()`	Returns a canonical representation for the string object.
`public int lastIndexOf(int ch)`	Returns the index within this string of the last occurrence of the specified character.
`public 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.
`public int lastIndexOf(String string)`	Searches in this string for the last index of the specified string.
`public int lastIndexOf(String subString, int start)`	Searches in this string for the index of the specified string.
`public int length()`	Returns the length of this string.
`public boolean regionMatches(boolean ignoreCase, int toffset,` `String other, int ooffset, int len)`	Tests if two string regions are equal.
`public` `String replace(char oldChar, char newChar)`	Returns a new string resulting from replacing all occurrences of oldChar in this string with newChar.
`public` `String replace(CharSequence target, CharSequence replacement)`	Replaces each substring of this string that matches the literal target sequence with the specified literal replacement sequence.
`public boolean startsWith(String prefix)`	Tests if this string starts with the specified prefix.
`public boolean startsWith(String prefix, int toffset)`	Tests if this string starts with the specified prefix beginning at the specified index.
`public` `String substring(int beginIndex)`	Returns a new string that is a substring of this string.
`public` `String substring(int beginIndex, int endIndex)`	Returns a new string that is a substring of this string.
`public char[] toCharArray()`	Converts this string to a new character array.
`public` `String toLowerCase()`	Converts all of the characters in this String to lower case.
`public` `String toString()`	This object (which is already a string!) is itself returned.
`public` `String toUpperCase()`	Converts all of the characters in this String to upper case.
`public` `String toUpperCase(Locale locale)`
`public` `String trim()`	Removes white space from both ends of this string.
`public static` `String valueOf(boolean b)`	Returns the string representation of the boolean argument.
`public static` `String valueOf(char c)`	Returns the string representation of the char argument.
`public static` `String valueOf(char[] data)`	Returns the string representation of the char array argument.
`public static` `String valueOf(char[] data, int offset, int count)`	Returns the string representation of a specific subarray of the char array argument.
`public static` `String valueOf(double d)`	Returns the string representation of the double argument.
`public static` `String valueOf(float f)`	Returns the string representation of the float argument.
`public static` `String valueOf(int i)`	Returns the string representation of the int argument.
`public static` `String valueOf(long l)`	Returns the string representation of the long argument.
`public static` `String valueOf(Object obj)`	Returns the string representation of the Object argument.
`public` `CharSequence subSequence(int start, int end)`	Returns a `CharSequence` from the `start` index (inclusive) to the `end` index (exclusive) of this sequence.
`public static` `String format(String format, Object... args)`
`public boolean contains(CharSequence seq)`	Checks if string contains the given char sequence.
`public boolean isEmpty()`	Checks if string is empty.
`public boolean regionMatches(int thisStart,` `String string, int start, int length)`	Compares the specified string to this string and compares the specified range of characters to determine if they are the same.
`public int codePointAt(int index)`	The code point at `index`.
`public int codePointBefore(int index)`	The code point that ends just before `index`.
`public int codePointCount(int beginIndex, int endIndex)`	The number of code points between `beginIndex` and `endIndex`.
`public int offsetByCodePoints(int index, int codePointOffset)`	The index `codePointOffset` code points away from `index`.
`public int indexOf(int ch, int beginIndex, int endIndex)`	The first index of `ch` in `[beginIndex, endIndex)`, or -1.
`public int indexOf(String str, int beginIndex, int endIndex)`	The first index of `str` that lies wholly in `[beginIndex, endIndex)`, or -1.
`public static` `String join(CharSequence delimiter, CharSequence... elements)`	The elements with `delimiter` between every two.
`public static` `String join(CharSequence delimiter, Iterable<? extends CharSequence> elements)`	The elements with `delimiter` between every two.
`public static` `String format(Locale l, String format, Object... args)`	As `format(String, Object...)`.
`public` `String toLowerCase(Locale locale)`	As `toLowerCase()`.
`public` `String formatted(Object... args)`	`String.format(this, args)`.
`public boolean isBlank()`	Whether the string is empty or holds nothing but white space.
`public` `String strip()`	The string without its leading and trailing white space.
`public` `String stripLeading()`	The string without its leading white space.
`public` `String stripTrailing()`	The string without its trailing white space.
`public` `String repeat(int count)`	The string `count` times over.
`public` `Stream<String> lines()`	The lines of the string, without their terminators.
`public` `String indent(int n)`	Every line indented by `n` spaces, or outdented for a negative `n`.
`public` `String stripIndent()`	The string with the indentation common to its lines removed.
`public` `String translateEscapes()`	The string with its escape sequences translated.
`public <R> R transform(Function<? super String, ? extends R> f)`	`f.apply(this)`.

Inherited methods

From Object

getClass, notify, notifyAll, wait, wait, wait, clone, finalize

From CharSequence

chars, codePoints, compare

Field details

CASE_INSENSITIVE_ORDER

public static final Comparator<String> CASE_INSENSITIVE_ORDER

Constructor details

String

public String()

Initializes a newly created String object so that it represents an empty character sequence.

String

public String(byte[] bytes)

Construct a new String by converting the specified array of bytes using the platform’s default character encoding. The length of the new String is a function of the encoding, and hence may not be equal to the length of the byte array. bytes - The bytes to be converted into characters JDK1.1

String

public String(byte[] bytes, int off, int len)

Construct a new String by converting the specified subarray of bytes using the platform’s default character encoding. The length of the new String is a function of the encoding, and hence may not be equal to the length of the subarray. bytes - The bytes to be converted into charactersoff - Index of the first byte to convertlen - Number of bytes to convert JDK1.1

String

public String(byte[] bytes, int off, int len, String enc)
throws UnsupportedEncodingException

Construct a new String by converting the specified subarray of bytes using the specified character encoding. The length of the new String is a function of the encoding, and hence may not be equal to the length of the subarray. bytes - The bytes to be converted into charactersoff - Index of the first byte to convertlen - Number of bytes to convertenc - The name of a character encoding

If the named encoding is not supported JDK1.1

Throws

UnsupportedEncodingException

String

public String(byte[] bytes, Charset charset)

Construct a new String by converting the specified array of bytes using the specified character encoding. The length of the new String is a function of the encoding, and hence may not be equal to the length of the byte array. Unlike the constructor taking a charset name, this throws no checked exception.

String

public String(byte[] bytes, String enc)
throws UnsupportedEncodingException

Construct a new String by converting the specified array of bytes using the specified character encoding. The length of the new String is a function of the encoding, and hence may not be equal to the length of the byte array. bytes - The bytes to be converted into charactersenc - The name of a supported character encoding

If the named encoding is not supported JDK1.1

Throws

UnsupportedEncodingException

String

public String(char[] value)

Allocates a new String so that it represents the sequence of characters currently contained in the character array argument. The contents of the character array are copied; subsequent modification of the character array does not affect the newly created string. value - the initial value of the string.

if value is null.

String

public String(char[] value, int offset, int count)

Allocates a new String that contains characters from a subarray of the character array argument. The offset argument is the index of the first character of the subarray and the count argument specifies the length of the subarray. The contents of the subarray are copied; subsequent modification of the character array does not affect the newly created string. value - array that is the source of characters.offset - the initial offset.count - the length.

if the offset and count arguments index characters outside the bounds of the value array.
if value is null.

String

public String(String value)

Initializes a newly created String object so that it represents the same sequence of characters as the argument; in other words, the newly created string is a copy of the argument string. value - a String.

String

public String(StringBuffer buffer)

Allocates a new string that contains the sequence of characters currently contained in the string buffer argument. The contents of the string buffer are copied; subsequent modification of the string buffer does not affect the newly created string. buffer - a StringBuffer.

If buffer is null.

String

public String(StringBuilder buffer)

String

public String(int[] codePoints, int offset, int count)

A string of the code points codePoints[offset] to codePoints[offset + count - 1].

String

public String(byte[] bytes, int offset, int length, Charset charset)

Decodes length bytes of bytes from offset with charset.

Method details

charAt

public char charAt(int index)

Returns the character at the specified index. An index ranges from 0 to length() - 1. The first character of the sequence is at index 0, the next at index 1, and so on, as for array indexing.

Parameters

index int: the index of the character to return.

Returns

the requested character.

Throws

IndexOutOfBoundsException: if index < 0 or index is greater than the length of this sequence.

compareTo

public int compareTo(String anotherString)

Compares two strings lexicographically. The comparison is based on the Unicode value of each character in the strings. The character sequence represented by this String object is compared lexicographically to the character sequence represented by the argument string. The result is a negative integer if this String object lexicographically precedes the argument string. The result is a positive integer if this String object lexicographically follows the argument string. The result is zero if the strings are equal; compareTo returns 0 exactly when the method would return true. This is the definition of lexicographic ordering. If two strings are different, then either they have different characters at some index that is a valid index for both strings, or their lengths are different, or both. If they have different characters at one or more index positions, let k be the smallest such index; then the string whose character at position k has the smaller value, as determined by using the < operator, lexicographically precedes the other string. In this case, compareTo returns the difference of the two character values at position k in the two string – that is, the value: this.charAt(k)-anotherString.charAt(k) If there is no index position at which they differ, then the shorter string lexicographically precedes the longer string. In this case, compareTo returns the difference of the lengths of the strings – that is, the value: this.length()-anotherString.length()

Parameters

anotherString String: the object to compare to this instance.

Returns

a negative integer if this instance is less than another; a positive integer if this instance is greater than another; 0 if this instance has the same order as another.

Throws

ClassCastException: if another cannot be converted into something comparable to this instance.

compareToIgnoreCase

public int compareToIgnoreCase(String anotherString)

contentEquals

public boolean contentEquals(CharSequence cs)

contentEquals

public boolean contentEquals(StringBuffer sb)

copyValueOf

public static String copyValueOf(char[] data)

copyValueOf

public static String copyValueOf(char[] data, int offset, int count)

concat

public String concat(String str)

Concatenates the specified string to the end of this string. If the length of the argument string is 0, then this String object is returned. Otherwise, a new String object is created, representing a character sequence that is the concatenation of the character sequence represented by this String object and the character sequence represented by the argument string. Examples: “cares”.concat(“s”) returns “caress” “to”.concat(“get”).concat(“her”) returns “together”

endsWith

public boolean endsWith(String suffix)

Tests if this string ends with the specified suffix.

equals

public boolean equals(Object anObject)

Compares this string to the specified object. The result is true if and only if the argument is not null and is a String object that represents the same sequence of characters as this object.

equalsIgnoreCase

public boolean equalsIgnoreCase(String anotherString)

Compares this String to another String, ignoring case considerations. Two strings are considered equal ignoring case if they are of the same length, and corresponding characters in the two strings are equal ignoring case. Two characters c1 and c2 are considered the same, ignoring case if at least one of the following is true: The two characters are the same (as compared by the == operator). Applying the method Character.toUpperCase(char) to each character produces the same result. Applying the method Character.toLowerCase(char) to each character produces the same result.

getBytes

public byte[] getBytes()

Convert this String into bytes according to the platform’s default character encoding, storing the result into a new byte array.

getBytes

public byte[] getBytes(String enc)
throws UnsupportedEncodingException

Convert this String into bytes according to the specified character encoding, storing the result into a new byte array.

Throws

UnsupportedEncodingException

getBytes

public byte[] getBytes(Charset charset)

Convert this String into bytes according to the specified character encoding, storing the result into a new byte array. Unlike getBytes(String), this throws no checked exception.

getChars

public void getChars(int srcBegin, int srcEnd, char[] dst, int dstBegin)

Copies characters from this string into the destination character array. The first character to be copied is at index srcBegin; the last character to be copied is at index srcEnd-1 (thus the total number of characters to be copied is srcEnd-srcBegin). The characters are copied into the subarray of dst starting at index dstBegin and ending at index: dstbegin + (srcEnd-srcBegin) - 1

hashCode

public int hashCode()

Returns a hashcode for this string. The hashcode for a String object is computed as s[0]*31^(n-1) + s[1]*31^(n-2) + … + s[n-1] using int arithmetic, where s[i] is the th character of the string, n is the length of the string, and ^ indicates exponentiation. (The hash value of the empty string is zero.)

indexOf

public int indexOf(int ch)

Returns the index within this string of the first occurrence of the specified character. If a character with value ch occurs in the character sequence represented by this String object, then the index of the first such occurrence is returned – that is, the smallest value such that: this.charAt( ) == ch is true. If no such character occurs in this string, then -1 is returned.

indexOf

public 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. If a character with value ch occurs in the character sequence represented by this String object at an index no smaller than fromIndex, then the index of the first such occurrence is returned–that is, the smallest value k such that: (this.charAt( ) == ch) && (

= fromIndex) is true. If no such character occurs in this string at or after position fromIndex, then -1 is returned. There is no restriction on the value of fromIndex. If it is negative, it has the same effect as if it were zero: this entire string may be searched. If it is greater than the length of this string, it has the same effect as if it were equal to the length of this string: -1 is returned.

indexOf

public int indexOf(String str)

Returns the index within this string of the first occurrence of the specified substring. The integer returned is the smallest value such that: this.startsWith(str, ) is true.

indexOf

public 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. The integer returned is the smallest value such that: this.startsWith(str, ) && (

= fromIndex) is true. There is no restriction on the value of fromIndex. If it is negative, it has the same effect as if it were zero: this entire string may be searched. If it is greater than the length of this string, it has the same effect as if it were equal to the length of this string: -1 is returned.

intern

public String intern()

Returns a canonical representation for the string object. A pool of strings, initially empty, is maintained privately by the class String. When the intern method is invoked, if the pool already contains a string equal to this String object as determined by the equals(Object) method, then the string from the pool is returned. Otherwise, this String object is added to the pool and a reference to this String object is returned. It follows that for any two strings s and t, s.intern()==t.intern() is true if and only if s.equals(t) is true. All literal strings and string-valued constant expressions are interned. String literals are defined in Section 3.10.5 of the Java Language Specification

lastIndexOf

public int lastIndexOf(int ch)

Returns the index within this string of the last occurrence of the specified character. That is, the index returned is the largest value such that: this.charAt( ) == ch is true. The String is searched backwards starting at the last character.

lastIndexOf

public 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. That is, the index returned is the largest value such that: (this.charAt(k) == ch) && (k <= fromIndex) is true.

lastIndexOf

public int lastIndexOf(String string)

Searches in this string for the last index of the specified string. The search for the string starts at the end and moves towards the beginning of this string.

Parameters

string String: the string to find.

Returns

the index of the first character of the specified string in this string, -1 if the specified string is not a substring.

Throws

NullPointerException: if string is null.

lastIndexOf

public int lastIndexOf(String subString, int start)

Searches in this string for the index of the specified string. The search for the string starts at the specified offset and moves towards the beginning of this string.

Parameters

subString String: the string to find.
start int: the starting offset.

Returns

the index of the first character of the specified string in this string , -1 if the specified string is not a substring.

Throws

NullPointerException: if subString is null.

length

public int length()

Returns the length of this string. The length is equal to the number of 16-bit Unicode characters in the string.

Returns

the number of characters.

regionMatches

public boolean regionMatches(boolean ignoreCase, int toffset, String other, int ooffset, int len)

Tests if two string regions are equal. A substring of this String object is compared to a substring of the argument other. The result is true if these substrings represent character sequences that are the same, ignoring case if and only if ignoreCase is true. The substring of this String object to be compared begins at index toffset and has length len. The substring of other to be compared begins at index ooffset and has length len. The result is false if and only if at least one of the following is true: toffset is negative. ooffset is negative. toffset+len is greater than the length of this String object. ooffset+len is greater than the length of the other argument. There is some nonnegative integer k less than len such that: this.charAt(toffset+k) != other.charAt(ooffset+k) ignoreCase is true and there is some nonnegative integer less than len such that: Character.toLowerCase(this.charAt(toffset+k)) != Character.toLowerCase(other.charAt(ooffset+k)) and: Character.toUpperCase(this.charAt(toffset+k)) != Character.toUpperCase(other.charAt(ooffset+k))

replace

public String replace(char oldChar, char newChar)

Returns a new string resulting from replacing all occurrences of oldChar in this string with newChar. If the character oldChar does not occur in the character sequence represented by this String object, then a reference to this String object is returned. Otherwise, a new String object is created that represents a character sequence identical to the character sequence represented by this String object, except that every occurrence of oldChar is replaced by an occurrence of newChar. Examples: “mesquite in your cellar”.replace(’e’, ‘o’) returns “mosquito in your collar” “the war of baronets”.replace(‘r’, ‘y’) returns “the way of bayonets” “sparring with a purple porpoise”.replace(‘p’, ’t’) returns “starring with a turtle tortoise” “JonL”.replace(‘q’, ‘x’) returns “JonL” (no change)

replace

public String replace(CharSequence target, CharSequence replacement)

Replaces each substring of this string that matches the literal target sequence with the specified literal replacement sequence. The replacement proceeds from the beginning of the string to the end, for example, replacing “aa” with “b” in the string “aaa” will result in “ba” rather than “ab”.

startsWith

public boolean startsWith(String prefix)

Tests if this string starts with the specified prefix.

startsWith

public boolean startsWith(String prefix, int toffset)

Tests if this string starts with the specified prefix beginning at the specified index.

substring

public String substring(int beginIndex)

Returns a new string that is a substring of this string. The substring begins with the character at the specified index and extends to the end of this string. Examples: “unhappy”.substring(2) returns “happy” “Harbison”.substring(3) returns “bison” “emptiness”.substring(9) returns "" (an empty string)

substring

public String substring(int beginIndex, int endIndex)

Returns a new string that is a substring of this string. The substring begins at the specified beginIndex and extends to the character at index endIndex - 1. Thus the length of the substring is endIndex-beginIndex. Examples: “hamburger”.substring(4, 8) returns “urge” “smiles”.substring(1, 5) returns “mile”

toCharArray

public char[] toCharArray()

Converts this string to a new character array.

toLowerCase

public String toLowerCase()

Converts all of the characters in this String to lower case.

toString

public String toString()

This object (which is already a string!) is itself returned.

toUpperCase

public String toUpperCase()

Converts all of the characters in this String to upper case.

toUpperCase

public String toUpperCase(Locale locale)

trim

public String trim()

Removes white space from both ends of this string. If this String object represents an empty character sequence, or the first and last characters of character sequence represented by this String object both have codes greater than ‘u0020’ (the space character), then a reference to this String object is returned. Otherwise, if there is no character with a code greater than ‘u0020’ in the string, then a new String object representing an empty string is created and returned. Otherwise, let k be the index of the first character in the string whose code is greater than ‘u0020’, and let m be the index of the last character in the string whose code is greater than ‘u0020’. A new String object is created, representing the substring of this string that begins with the character at index k and ends with the character at index m-that is, the result of this.substring(k,m+1). This method may be used to trim whitespace from the beginning and end of a string; in fact, it trims all ASCII control characters as well.

valueOf

public static String valueOf(boolean b)

Returns the string representation of the boolean argument.

valueOf

public static String valueOf(char c)

Returns the string representation of the char argument.

valueOf

public static String valueOf(char[] data)

Returns the string representation of the char array argument.

valueOf

public static String valueOf(char[] data, int offset, int count)

Returns the string representation of a specific subarray of the char array argument. The offset argument is the index of the first character of the subarray. The count argument specifies the length of the subarray. The contents of the subarray are copied; subsequent modification of the character array does not affect the newly created string.

valueOf

public static String valueOf(double d)

Returns the string representation of the double argument. The representation is exactly the one returned by the Double.toString method of one argument.

valueOf

public static String valueOf(float f)

Returns the string representation of the float argument. The representation is exactly the one returned by the Float.toString method of one argument.

valueOf

public static String valueOf(int i)

Returns the string representation of the int argument. The representation is exactly the one returned by the Integer.toString method of one argument.

valueOf

public static String valueOf(long l)

Returns the string representation of the long argument. The representation is exactly the one returned by the Long.toString method of one argument.

valueOf

public static String valueOf(Object obj)

Returns the string representation of the Object argument.

subSequence

public CharSequence subSequence(int start, int end)

Returns a CharSequence from the start index (inclusive) to the end index (exclusive) of this sequence.

Parameters

start int: the start offset of the sub-sequence. It is inclusive, that is, the index of the first character that is included in the sub-sequence.
end int: the end offset of the sub-sequence. It is exclusive, that is, the index of the first character after those that are included in the sub-sequence

Returns

the requested sub-sequence.

Throws

IndexOutOfBoundsException: if start end, or if start or end are greater than the length of this sequence.

format

public static String format(String format, Object... args)

contains

public boolean contains(CharSequence seq)

Checks if string contains the given char sequence.

Parameters

seq CharSequence: The charsequence to check

Returns

True if seq is contained in string.

isEmpty

public boolean isEmpty()

Checks if string is empty.

Returns

True if string is empty

regionMatches

public boolean regionMatches(int thisStart, String string, int start, int length)

Compares the specified string to this string and compares the specified range of characters to determine if they are the same.

Parameters

thisStart int: the starting offset in this string.
string String: the string to compare.
start int: the starting offset in the specified string.
length int: the number of characters to compare.

Returns

true if the ranges of characters are equal, false otherwise

Throws

NullPointerException: if string is null.

codePointAt

public int codePointAt(int index)

The code point at index.

codePointBefore

public int codePointBefore(int index)

The code point that ends just before index.

codePointCount

public int codePointCount(int beginIndex, int endIndex)

The number of code points between beginIndex and endIndex.

offsetByCodePoints

public int offsetByCodePoints(int index, int codePointOffset)

The index codePointOffset code points away from index.

indexOf

public int indexOf(int ch, int beginIndex, int endIndex)

The first index of ch in [beginIndex, endIndex), or -1.

indexOf

public int indexOf(String str, int beginIndex, int endIndex)

The first index of str that lies wholly in [beginIndex, endIndex), or -1.

join

public static String join(CharSequence delimiter, CharSequence... elements)

The elements with delimiter between every two.

join

public static String join(CharSequence delimiter, Iterable<? extends CharSequence> elements)

The elements with delimiter between every two.

format

public static String format(Locale l, String format, Object... args)

As format(String, Object...).

toLowerCase

public String toLowerCase(Locale locale)

As toLowerCase().

formatted

public String formatted(Object... args)

String.format(this, args).

isBlank

public boolean isBlank()

Whether the string is empty or holds nothing but white space.

strip

public String strip()

The string without its leading and trailing white space.

stripLeading

public String stripLeading()

The string without its leading white space.

stripTrailing

public String stripTrailing()

The string without its trailing white space.

repeat

public String repeat(int count)

The string count times over.

lines

public Stream<String> lines()

The lines of the string, without their terminators.

indent

public String indent(int n)

Every line indented by n spaces, or outdented for a negative n.

stripIndent

public String stripIndent()

The string with the indentation common to its lines removed.

translateEscapes

public String translateEscapes()

The string with its escape sequences translated.

transform

public <R> R transform(Function<? super String, ? extends R> f)

f.apply(this).